NZ530584A

NZ530584A - HMG-COA reductase inhibitor extended release formulation

Info

Publication number: NZ530584A
Application number: NZ530584A
Authority: NZ
Inventors: Chih-Ming Chen; Joseph Chou; David Wong
Original assignee: Andrx Corp
Priority date: 1999-11-08
Filing date: 2000-11-03
Publication date: 2004-02-27

Abstract

A controlled release oral solid dosage form comprising lovastatin and a controlled release carrier, said dosage form increasing the bioavailability of lovastatin but not lovastatin acid when compared to the same amount of lovastatin administered in an immediate release dosage form, the dosage form also providing a reduction in serum cholesterol levels.

Description

<div class="application article clearfix" id="description"> 530 5 8 4 This specification is divided out of New Zealand Patent NZ518770 (hereinafter referred to as "that invention") PATENTS FORM NO. 5 Fee No. 4: $250.00 HMG-COA REDUCTASE INHIBITOR EXTENDED RELEASE FORMULATION WE ANDRX CORPORATION, a United States company of 4001 S.W. 47th Avenue, Fort Lauderdale, Florida 33314, UNITED STATES OF AMERICA hereby declare the invention for which I/We pray that a patent may be granted to me/us, and the method by which it is to be performed to be particularly described in and by the following statement: PATENTS ACT 1953 COMPLETE SPECIFICATION SnteUectosI Prr Office of i- I z:: of HMG-COA REDUCTASE INHIBITOR EXTENDED RELEASE FORMULATION 5 BACKGROUND OF THE INVENTION The use of HMG-COA reductase inhibitors for the reduction of serum cholesterol levels is well known. These compounds include alkyl esters of hydroxy substituted naphthalenes which are orally effective in the reduction of serum cholesterol levels. 10 Examples of these compounds include mevastatin which is described in U.S. 3,671,523; lovastatin which is described in U.S. 4,231,938; pravastatin which is described in U.S. 4,346,227; and simvastatin which is described in U.S. 4,444,784. All of these patents are incorporated by reference. 15 Lovastatin is a metabolite which is produced by the natural fermentation of an fungus of the Aspergillus genus. Lovastatin acts systemically to lower blood serum cholesterol levels by disrupting the biosynthesis of cholesterol in the liver, where 70% to 80% of body cholesterol is produced. Specifically lovastatin interrupts a step in the endogenous production of cholesterol by inhibiting the HMG coenzyme A reductase from combining with 20 bile acids in the digestive tract such that the bile acids are excreted from the body without reabsorption. With synthesis in the liver thusly inhibited, the liver cells must take cholesterol from the bloodstream, and they do so by increasing their production of cell surface receptors for LDL cholesterol. Lovastatin formulations are generally capable of lowering the blood serum cholesterol level by about 30-40%. The other compounds of this class are derived 25 from natural or synthetic sources using well known procedures and have similar mechanisms of activity. However, it is desirable to enhance the activity of these compounds to achieve even greater reductions of blood serum cholesterol levels in connection with the treatment of ?0 hypercholesterolemia and other maladies. Accordingly, the present invention provides a novel" controlled release formulation of a compound which is an alkyl ester of a hydroxy substituted 1A naphthalene derivative which provides for a gradual release of the compound. This formulation has been prepared to provide a slow controlled release of these compounds in order to provide a more constant level of bioavailability in order to provide an enhanced effect that cannot be achieved by conventional immediate release dosing. The use of a controlled release form of is 5 believed to be specially useful for those who have meals at irregular times or those who frequently eat snacks between meals. These subjects include night shift workers, airline personnel and travelers, and those individuals with blood sugar problems who eat frequent small meals. In addition, it is believed that the human body synthesizes high amounts of cholesterol during the hours of sleep and it is desirable in certain cases to provide therapeutic level of these 10 compounds during periods of sleep. Controlled release formulations have been described in U.S. 4,615,698 which have been based on an osmotic dosage form which is designed to collapse and cause the faced surfaces to come into a close contacting arrangement as the drug is delivered through a passageway in the 15 semi-permeable wall of the dosage form. In addition, U.S. 4,503,030 discloses an osmotic dosage form which has a passageway and a semi-permeable membrane consisting of a particular cellulose polymer and a pH-sensitive material which could be an enteric coating material. This patent describes the use of 1:1 mixtures of a pH sensitive material and cellulose polymer which are applied at a level of about 70% by weight based on the total weight of the osmotic core tablet 20 and coating material. In the parent application, the applicants have discovered that a ratio of 0.75:1, and lower, of pH sensitive material to cellulose polymer may be used to provide a stable membrane around an osmotic core tablet at a coating level of 1-4% by weight based on the total weight of the 25 osmotic core tablet and coating material. These osmotic tablets will substantially, completely deliver the compound without the need to provide a passageway in the tablet according to the teachings of the prior art. In addition the osmotic tablet of the invention will provide higher bioavailability and lower peak plasma drug concentrations than are provided by the same weight of the alkyl ester of a hydroxy substituted naphthalene derivative in a conventional immediate 30 release dosage form. 2 SUMMARY OF THE INVENTION It is an object of the present invention to provide oral compositions which enhance the 5 activity of antiliperaic agents, specifically HMG-CoA reductase inhibitors, to achieve even greater reductions of blood serum cholesterol levels in connection with the treatment of hypercholesterolemia and other maladies. It is an object of the present invention to provide a controlled release form of an alkyl 10 ester of a hydroxy substituted naphthalene derivative. It is an object of the present invention to provide a controlled release form of an alkyl ester of a hydroxy substituted naphthalene derivative which provides effective yet novel plasma concentration profiles of the drug. 15 It is a further object of the present invention to provide methods of treating human patients who have high serum cholesterol levels. It is a further object of the present invention to provide methods of enhancing the 20 activity of antilipemic agents, specifically HMG-CoA reductase inhibitors, to achieve even greater reductions of blood serum cholesterol levels in connection with the treatment of hypercholesterolemia and other maladies. It is also an object of the present invention to provide a controlled release dosage 25 formulation of an alkyl ester of a hydroxy substituted naphthalene derivative which substantially completely releases said alkyl ester in about 4 to 30 hours in vitro in a Type 2 USP 23 dissolution apparatus in 2% sodium lauryl sulfate, pH buffer to 7.0 at 37°C and 50rpm. 3 In accordance with the above-mentioned objects and others, the present invention provides a novel controlled release formulation of a compound which is an alkyl ester of a hydroxy substituted naphthalene derivative which provides for a gradual release of the compound. This formulation has been prepared to provide a slow controlled release of these 5 compounds in order to provide a more constant level of bioavailability in order to provide an enhanced effect that cannot be achieved by conventional immediate release dosing. In view of the above objects and others, the invention is in part directed to a controlled release oral solid dosage form for the reduction of serum cholesterol levels in 10 humans comprising a drug comprising an alkyl ester of hydroxy substituted naphthalenes (e.g., lovastatin) and a controlled release carrier in an amount effective to provide a controlled release of the drug, the dosage form providing a mean time to maximum plasma concentration (Tmax) of the drug which occurs at about 10 to about 32 hours after oral administration to human patients, the dosage form providing a reduction in serum cholesterol 15 levels when administered to human patients on a once-a-day basis. The invention is further directed to a controlled release oral solid dosage form for the reduction of serum cholesterol levels in humans, comprising a drug comprising an alkyl ester of hydroxy substituted naphthalenes, and a controlled release carrier for the drug, the dosage 20 form providing a substantially complete release of the drug in about 4 to 30 hours in vitro in a Type 2 USP 23 dissolution apparatus in 2% sodium lauryl sulfate, pH buffer to 7.0 at 37°C and 50rpm, the dosage form providing a mean time to maximum plasma concentration (Tmax) which occurs at about 10 to about 32 hours after oral administration to human patients, the dosage form achieving a reduction in serum cholesterol levels when administered to human 25 patients on a once-a-day basis. Further embodiments of the invention relate to a controlled release oral solid dosage form for the reduction of serum cholesterol levels in humans, comprising a drug comprising an alkyl ester of hydroxy substituted naphthalenes, and a controlled release carrier for the 30 drug, the controlled release dosage form providing a dissolution of from about 0% to about « 4 25% drug released after 2 hours; from about 40% to about 85% drug released after 6 hours; and not less than about 75% drug released after 16 hours, when measured in vitro in a Type 2 USP 23 dissolution apparatus in 2% sodium lauryl sulfate, pH buffer to 7.0 at 37°C and 50rpm, and which preferably provides a time to maximum plasma concentration (Tmax) of the 5 drug which occurs at about 10 to about 32 hours after oral administration to human patients, the dosage form achieving a reduction in serum cholesterol levels when administered to human patients on a once-a-day basis. In certain preferred embodiments, the controlled release dosage form provides a 10 dissolution of from about 0% to about 20% drug released after 2 hours; from about 50% to about 80% drug released after 6 hours; and not less than about 80% drug released after 16 hours, when measured in vitro in a Type 2 USP 23 dissolution apparatus in 2% sodium lauryl sulfate, pH buffer to 7.0 at 37°C and 50rpm. In certain further preferred embodiments, the controlled release dosage form provides a dissolution of from about 10% to about 15% drug 15 released after 2 hours; from about 65% to about 75% drug released after 6 hours; and not less than about 79% drug released after 16 hours, when measured in vitro in a Type 2 USP 23 dissolution apparatus in 2% sodium lauryl sulfate, pH buffer to 7.0 at 37°C and 50rpm. In certain embodiments, the mean time to maximum plasma concentration of the drug 20 preferably occurs at about 14 to about 24 hours after oral administration. In certain preferred embodiments of the invention, the mean time to maximum plasma concentration of total HMG-CoA Reductase Inhibitors preferably occurs at about 13 to about 21 hours after oral administration. Preferably., the controlled release formulations of the 25 invention provide a mean time to maximum plasma concentration of active HMG-CoA Reductase Inhibitors which preferably occurs at about 6.2 to about 20.1 hours, and more preferably from about 9.5 to about 15.2 hours after oral administration. Preferably, the controlled release formulations in accordance with the invention provide a mean maximum plasma concentration (Cmax) of total HMG-CoA Reductase Inhibitors from about 4.7 ng/ml to 30 about 25.4 ng/ml, preferably from about 10.5 ng/ml to about 17.3 ng/ml, and a mean 5 maximum plasma concentration (Cmax) Of active HMG-CoA Reductase Inhibitors preferably from about 2.1 ng/ml to about 22.5 ng/ml, preferably 6.4 ng/ml to about 13.4 ng/ml (e.g., based on a 40 mg dose of lovastatin). 5 In certain preferred embodiments of the invention, the drug is selected from the group consisting of lovastatin, a derivative of lovastatin, an active metabolite of lovastatin, mevastatin, pravastatin, simvastatin, and mixtures thereof. In certain preferred embodiments of the invention, the controlled release oral solid 10 dosage form includes lovastatin in an amount of from about 10 to about 80 mg (e.g., 10, 20, 40 or 80 mg). In embodiments in which the drug is lovastatin, the formulations preferably provide a maximum plasma concentration (Cmax) of lovastatin from about 1 ng/ml to about 8 ng/ml, preferably from about 1.5 ng/ml to about 7.1 ng/ml, and more preferably from about 3 ng/ml to about 4 ng/ml, based on a 40 mg dose of lovastatin (the plasma levels of lovastatin 15 preferably being dose proportional, as described herein in the appended Examples). When the drug is lovastatin, the controlled release formulations of the invention preferably provide a mean AUCMghr of lovastatin from about 15 to about 90 ng*hr/ml, more preferably from about 34 to about 77 ng*hr/ml. In certain preferred embodiments of the invention where the drug is lovastatin, the dosage form preferably provides a mean time to maximum plasma 20 concentration of lovastatin acid at about 5.3 to about 28.7 hours after oral administration, and more preferably at about 13.0 to about 20.9 hours, after oral administration. In further preferred embodiments where the drug is lovastatin, the dosage form provides a mean maximum plasma concentration (Cmax) of lovastatin acid from about 1.05 ng/ml to about 7.22 ng/ml, preferably from about 2.50 ng/ml to about 4.90 ng/ml, based on a 40 mg dose of 25 lovastatin. In such embodiments, the dosage from may provide a mean AUC^g^ of lovastatin acid from about 9.96 to about 132.54 ng*hr/ml, preferably from about 47.5 to about 91.2 ng«hr/ml. The present invention further relates to a method for reducing serum cholesterol levels 30 in humans, comprising orally administering a drug comprising an alkyl ester of hydroxy 6 substituted naphthalenes in a controlled" release oral solid dosage form which provides a mean time to maximum plasma concentration (TraaJ of the drug which occurs at about 10 to about 32 hours after oral administration of said dosage form to human patients, and which achieves an effective reduction in serum cholesterol levels when administered to human patients on a 5 once-a-day basis. In certain preferred embodiments where the drug is lovastatin, it is preferred that after administration the dosage form provides a mean maximum plasma concentration (Cmax) of lovastatin from about 1.5 ng/ml to about 7.1 ng/ml, based on a 40 mg dose of lovastatin (e.g., where the plasma levels and Cmax of lovastatin is dose proportional), after administration of a single dose to human patients. In certain preferred embodiments, 10 orally administering lovastatin in a controlled release oral solid dosage form provides a mean time to maximum plasma concentration (Tmax) which occurs at about 14 to about 24 hours after oral administration of said dosage form to human patients, and a maximum plasma concentration (Cmax) of the drug of from about 3 ng/ml to about 4 ng/ml (based on a 40 mg dose of lovastatin), such that the dosage form achieves a reduction in serum cholesterol levels 15 when administered to human patients on a once-a-day basis. The present invention further relates to a method for reducing serum cholesterol levels in humans, comprising orally administering a drug comprising an alkyl ester of hydroxy substituted naphthalenes in a controlled release oral solid dosage form to human patients in 20 the morning (e.g., after administration of a single dose of lovastatin), which dosage form provides a mean time to maximum plasma concentration (Tmax) at about 11 to about 32 hours after oral administration to human patients, the dosage form achieving a reduction in serum cholesterol levels when administered to human patients on a once-a-day basis. In this embodiment, when the drug is lovastatin, the dosage form preferably provides a mean 25 maximum plasma concentration (Cmax) of said drug from about 1.5 ng/ml to about 6.9 ng/ml, based on a 40 mg dose of lovastatin. In this embodiment, where the human patients are administered the dosage form after breakfast in the fed state, it is preferred that the dosage form provides a mean time to maximum plasma concentration (Tmax) whicthoccurs at about 16 to about 32 hours after oral administration of a single dose, more preferably at about 22 to 30 about 26 hours after oral administration, and that it further preferably provides a mean 7 maximum plasma concentration (Cmax) of the drug from about 1.5 ng/ml to about 4.5 ng/ml, based on a 40 mg dose of lovastatin, after oral administration of a single dose. When the human patients are adminstered the dosage form in the morning in the fasted state, it is preferred that the dosage form provides a mean time to maximum plasma concentration (Tmax) 5 which occurs at about 5.3 to about 17 hours after oral administration of a single dose, more preferably at about 9 to about 13 hours after oral administration, and preferably provides a mean maximum plasma concentration (Cmax) of the drug from about 2.9 ng/ml to about 6.9 ng/ml, based on a 40 mg dose of lovastatin, after oral administration of a single dose. 10 The present invention further relates to a method for reducing serum cholesterol levels in humans, comprising orally administering a drug comprising an alkyl ester of hydroxy substituted naphthalenes in a controlled release oral solid dosage form to human patients at dinner time, which dosage form provides a mean time to maximum plasma concentration (Tmax) at about 10.4 to about 20.6 hours after oral administration (e.g., after a single dose), the 15 dosage form achieving a reduction in serum cholesterol levels when administered to human patients on a once-a-day basis. Preferably, where the drug is lovastatin, the dosage form provides a mean maximum plasma concentration (Cmax) of said drug from about 1.9 ng/ml to about 4.4 ng/ml, based on a 40 mg dose of lovastatin. In such embodiments, it is preferred that the mean time to maximum plasma concentration (Tmax) is at about 13.5 to about 17.5 20 hours after oral administration, and more preferably at about 15.5 hours after oral administration. It is further preferred the dosage form provides a mean maximum plasma concentration (C,,^) of said drug of about 3 ng/ml, based on a 40 mg dose of lovastatin. The present invention further relates to a method for reducing serum cholesterol levels 25 in humans, comprising orally administering a drug comprising an alkyl ester of hydroxy substituted naphthalenes in a controlled release oral solid dosage form to human patients at bedtime, which dosage form provides a mean time to maximum plasma concentration (Tmax) which occurs at about 10 to about 23.2 hours after oral administration (e.g., of a single dose) to a population of human patients, the dosage form achieving a reduction in serum 30 cholesterol levels when administered to human patients on a once-a-day basis. Preferably, 8 where the drug is lovastatin, the dosage form provides a mean maximum plasma concentration (Cmax) of said drug from about 1 ng/ml to about 8 ng/ml, based on a 40 mg dose of lovastatin. In this embodiment, where the human patients are administered the dosage form at bedtime, it is preferred that the dosage form provides a mean time to maximum 5 plasma concentration (Tmax) which occurs at about 14.2 to about 16.9 hours after oral administration of a single dose, and preferably provides a mean maximum plasma concentration (Cmax) of the drug of about 4 ng/ml, based on a 40 mg dose of lovastatin, after oral administration of a single dose. When administered at bedtime, the dosage forms of the invention preferably provide a mean time to maximum plasma concentration (Tmax) which 10 occurs at about 10 to about 22 hours after oral administration to human patients at steady-state, preferably at about 12 to about 16 hours, and more preferably at about 14 hours after oral administration. Preferably, the dosage form provides a mean maximum plasma concentration (Cmax) of said drug from about 3 ng/ml to about 8 ng/ml, more preferably about 5.5 ng/ml, based on a 40 mg dose of lovastatin at steady-state. 15 The invention also relates to a method for improving the dose-response relationship achieved via the administration of a statin drug orally administered in immediate release form, comprising orally administering the statin in a controlled release dosage form which provides a mean time to maximum plasma concentration (Tmax) of the statin drug which 20 occurs at about 10 to about 32 hours after oral administration to human patients. In certain preferred embodiments of the present invention, administration of the controlled release oral solid dosage forms of the invention achieves an accumulation of lovastatin and its latent and active metabolites at steady-state conditions of about 1.4 to about 25 2 fold the levels attained by immediate release lovastatin administered once daily. In certain preferred embodiments, the dosage forms of the invention provide increased systemic bioavailability of lovastatin, but at the same time do not provide increased bioavailability of lovastatin acid, active or total inhibitors. -i The invention is further related to a controlled release oral solid dosage form, comprising a therapeutically effective amount of lovastatin, and a controlled release carrier providing delivery of said lovastatin when said dosage form is orally administered to human patients, such that a mean maximum plasma concentration (Cmax) of lovastatin from about 1 5 ng/ml to about 5.5 ng/ml and preferably from about 3 ng/ml to about 5.5 ng/ml is attained, after administration of a single dose or at steady-state in a population of human patients in need of such therapy, per 40 mg dose of lovastatin. The invention is further related to a method for reducing serum cholesterol levels in 10 humans, comprising orally administering a controlled release oral solid dosage form containing a therapeutically effective amount of lovastatin which provides a mean maximum plasma concentration (C^J of lovastatin from about 1 ng/ml to about 5.5 ng/ml, preferably from about 3 ng/ml to about 5.5 ng/ml, after administration of a single dose or at steady-state in a population of human patients in need of such therapy, per 40 mg dose of lovastatin. 15 The invention is further related to a method for providing increased systemic bioavailability of lovastatin, while at the same time not increasing the bioavailability of lovastatin acid, active or total inhibitors compared to an immediate release reference standard form of lovastatin, comprising preparing a controlled release oral solid dosage form of 20 lovastatin which comprises a therapeutically effective amount of lovastatin and a sufficient amount of a controlled release carrier such that the controlled release dosage form provides a dissolution of from about 0% to about 25% lovastatin released after 2 hours; from about 40% to about 85% lovastatin released after 6 hours; and not less than about 75% lovastatin released after 16 hours, when measured in vitro in a Type 2 USP 23 dissolution apparatus in 25 2% sodium lauryl sulfate, pH buffer to 7.0 at 37°C and 50rpm, and such that the dosage form provides a mean time to maximum plasma concentration (T^) of lovastatin from about 10 to about 32 hours after oral administration to human patients. The dosage form is administered to human patients on a once-a-day basis. , 10 For purposes of this disclosure, the term "statin" encompasses alkyl esters of hydroxy substituted naphthalenes which are orally effective in the reduction of serum cholesterol levels, and includes but is not limited to examples of these compounds described in U.S. 3,671,523 (include mevastatin); compounds described in U.S. 4,231,938 (including lovastatin); compounds described in U.S. 4,346,227 (including pravastatin); and compounds is described in U.S. 4,444,784 (including simvastatin). The term "steady state" means that the blood plasma concentration curve for a given drug has been substantially repeated from dose to dose of the drug formulation. The term "single dose" means that the human patient has received a single dose of the drug formulation and the drug plasma concentration has not achieved steady state. The term "multiple dose" means that the human patient has received at least two doses of the drug formulation in accordance with the dosing interval for that formulation (e.g, on a once a day basis). Patients who have received multiple doses of the controlled release formulations of the invention may but not necessarily have attained steady state drug plasma levels, as the term multiple dose is defined herein. The term "morning" as it is used herein with respect to the dosing of the controlled release formulations of the invention means that the controlled release formulation is orally administered early in the day after the patient has awakened from overnight sleep, generally between about 6 a.m. and 11 a.m. (regardless of whether breakfast is eaten at that time, unless so specified herein). The term "dinnertime" as it is used herein with respect to the dosing of the controlled release formulations of the invention means that the controlled release formulation is orally administered at a time when dinner is normally eaten (regardless of whether a meal is actually eaten at that time, unless so specified herein), generally between about 4 p.m. and 8 p.m. The term "bedtime" as it is used herein with respect to the dosing of the controlled release formulations of the invention means that the controlled release formulation is orally administered before the patient goes to bed in the evening, generally between about 8 p.m. and 12 p.m. The phrase "therapeutically effective reduction" when used herein is meant to signify that serum cholesterol levels are reduced by approximately the same amount as an immediate release reference standard (e.g., Mevacor®) or more, when the controlled release dosage form is orally administered to a human patient on a once-a-day basis. 5 BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a graph of in vitro dissolution data which shows the dissolution profile of the formulation of Example 1 in 2% sodium lauryl sulfate at pH 7.0 in NaH2P04 buffer in a USP 10 XXn Type II dissolution apparatus at 50 rpm at 37°C. FIG. 2 is a graph of in vitro dissolution data which shows the dissolution profiles of the formulations of Examples 2, 3 and 4 in 2% sodium lauryl sulfate at pH 7.0 in NaH2P04 buffer in a USP XXII Type II dissolution apparatus at 50 rpm at 37°C. 15 FIG. 3 is a graph of the in-vitro dissolution data which shows the dissolution profiles of Examples 2 and 5-7 under similar conditions as set forth above with respect to Fig. 2. FIG. 4 is a graph of the in-vitro dissolution data which shows the dissolution profiles 20 of Examples 8 under similar conditions as set forth above with respect to Fig. 3. FIG. 5 is a graph of the in-vitro dissolution data which shows the dissolution profiles of Examples 9 under similar conditions as set forth above with respect to Fig. 3. 25 FIG. 6 is a graph of comparative data which shows mean (± SD) plasma concentration time profiles of lovastatin in healthy subjects (n=8) following a single oral dose of a conventional immediate release dose of 40mg of lovastatin and an extended release 40mg dose of lovastatin according to the invention (Example 5) 12 FIG. 7 is a graph of comparative data which shows mean (±SD) plasma concentration time profiles of lovastatin acid in healthy subjects (n=8) following a single oral dose of a conventional immediate release dose of 40mg of lovastatin and an extended release 40mg dose of lovastatin according to the invention (Example 5). 5 FIG. 8 is a graph of comparative data which shows mean (±SD) plasma concentration time profiles of lovastatin in healthy subjects (n=9) following a single oral dose in the morning of a conventional immediate release dose of 40mg of lovastatin with breakfast and an extended release 40mg dose of lovastatin according to the invention (Example 5) with and 10 without breakfast. FIG. 9 is a graph of comparative data which shows mean (±SD) plasma concentration time profiles of lovastatin acid in healthy subjects (n=9) following a single oral dose in the morning of a conventional immediate release dose of 40mg of lovastatin with breakfast and 15 an extended release 40mg dose of lovastatin according to the invention (Example 5) with and without breakfast. FIG. 10 is a graph of the mean plasma concentration-time profiles of lovastatin and lovastatin acid in patients (n=12) after multiple-dose administration of 40mg Lovastatin XL 20 and a conventional 40mg immediate release dose of lovastatin (Study No. 5, Day 1 and Day 28). FIG. 11 is a graph of the mean plasma concentration-time profiles of total and active inhibitors of HMG-CoA Reductase in patients (n=12) after multiple-dose administration of 25 40mg Lovastatin XL and a conventional 40mg immediate release dose of lovastatin (Study No. 5, Day 1 and Day 28). FIG. 12 is a graph of a regression line depicting C^ plotted against dose for Study No. 5. 13 FIG. 13 is a graph of a regression line depicting AUC0j)8hr plotted against dose for Study No. 5. DETAILED DESCRIPTION OF THE INVENTION 5 The controlled release dosage form is preferably prepared by combining mevastatin, pravastatin, simvastatin or lovastatin with a pharmaceutically acceptable, water swellable polymer and an osmotic agent into a compressed tablet core having an optional first coating for sealing and protection and a second coating comprising a pH sensitive agent water 10 insoluble polymer. Mevastatin, pravastatin, simvastatin and lovastatin are well known compounds that are described in the prior art including the particular patents which have been cited herein. It is also within the scope of the invention to use mixtures of different alkyl esters of hydroxy substituted naphthalenes. 15 Specifically, a pharmaceutically acceptable, water swellable polymer and an osmotic agent are combined with the drug which may be micronized or unmicronized or amorphous or crystalline and compressed to form the tablet core. The osmotic agent is any nontoxic pharmaceutically acceptable water soluble compound which will dissolve sufficiently in water and increase the osmotic pressure inside the core of the tablet. The osmotic agents 20 include the simple sugars and salts such as sodium chloride, potassium chloride, magnesium sulfate, magnesium sulfate, magnesium chloride, sodium sulfate, lithium sulfate, urea, inositol, sucrose, lactose, glucose, sorbitol, fructose, mannitol, dextrose, magnesium succinate, potassium acid phosphate and the like. The preferred osmotic agent for the tablet core is a simple sugar such as anhydrous lactose in the range of 0-50% by weight, based on 25 the weight of the compressed, uncoated tablet. The pharmaceutically acceptable, water swellable polymer may be any pharmaceutically acceptable polymer which swells and expands in the presence of water to slowly release the lovastatin. These polymers include polyethylene oxide, methylcellulose, 30 hydroxypropylcellulose, hydroxypropylmethylcellulose and the like. In a preferred 14 embodiment, the water swellable polymer will be polyethylene oxide (obtained from Union Carbide Corporation under the trade name Polyox WSR Coagulant or Polyox WSR N 80) These materials form a viscous gel in water or other solvent system at a sufficient concentration to control the release of the lovastatin. This will generally require a concentration of the pharmaceutically acceptable, water swellable polymer of about 0-50% by weight of the compressed, uncoated tablet. Binder may be employed in a sufficient amount so that when it is combined with a suitable solvent, mixed with the water soluble osmotic agent and agitated, granules will be formed which may be compressed into a tablet core. Prior to compressing the granules, the conventional solid pharmaceutical diluents such as microcrystalline cellulose, lactose, dextrose and the like may be added to the granule forming mixture in amounts from about 0 to 51% weight based on the weight of the compressed, uncoated tablet. In the present case, the above mentioned osmotic agent, lactose, may function as a binder in the tablet compression step. In the preparation of the tablets of the invention, various solvents may be used to prepare the granules. In addition, various other diluents, excipients, lubricants, dyes, pigments, dispersants, emulsifiers, etc. may be used to optimize the formulations of the invention. Additionally, a surfactant is used in the preferred embodiment. The surfactant may be any ionic or non-ionic water soluble surfactant which may be employed in the range of 0-50% by weight or preferably 1-5% by weight. The preferred surfactant for the present formulation is sodium lauryl sulfate but other surfactants such as polysorbate 20, 60 or 80; polyoxl stearate and the like. Furthermore, the preferred embodiment may comprise a lubricant. Ideally, the lubricant will be in the range of 0.5 to 2.5% by weight of the compressed, uncoated tablet. 15 After the above described tablet "core is formed, it is coated with: 1) an optional protective first coating on the tablet core and/or an optional pH sensitive coating; 2) an outer coating comprising a pH sensitive agent and a water insoluble polymer. 5 Specifically, a protective first coating may be used at a level in the range of 0-10% by weight which may be applied from a coating system such as opadry Clear sold by Colorcon Corporation. In an especially preferred embodiment, the Opadry Clear will be 2.83% by weight and will be combined with an osmotic agent in the range of 0-10% by weight. While the osmotic agent may be any salt, low molecular weight molecule or water soluble polymers, 10 the preferred agent is sodium chloride. The osmotic agent is added to the coating system when the coating system is being dispersed into purified water. The coating system which contains the osmotic agent may then be sprayed onto the tablets to form a protective coating layer. As mentioned above, this protective first coating is optional. 15 An optional inner or over coat over the outer coat may also be applied which comprises a pH sensitive polymer which functions as an enteric polymer in that it does not begin to dissolve until pH conditions in excess of the stomach region are encountered. Generally, the pH sensitive materials do not dissolve and begin to release the active drug until a pH above 3.0 and preferably above 5.5. Materials such as such as Eudragit L (copolymer of 20 poly(methacrylic acid, methylmethacrylate), 1:1 ratio; MW (No. Av. 135,000 USP Type A) or Eudragit S (copolymer of poly(methacrylic acid, methylmethacrylate, 1:2 ratio MW (No. Av. 135,000 - USP Type B) hydroxypropyl methyl cellulose phthalate, cellulose acetate phthalate, polyvinyl acetate phthalate and the like may be used in the range of 0-30% by weight and preferably 2 to 4 percent by weight of the combined weight of the compressed, 25 uncoated tablet and the inner coating of the pH sensitive polymer. The outer coating comprises a pH sensitive polymer which functions as an enteric polymer in that it does not begin to dissolve untiljpH conditions in excess of the pH of the stomach region are encountered and a water insoluble polymer which provide controlled 30 release properties to the coating formulation. The pH sensitive polymer is the same type of * 16 material that is described above as the optional inner coating layer. The water insoluble polymer may be a cellulosic polymer such as ethylcellulose, cellulose acylate, cellulose mono-, di- or triacetate. The pH sensitive polymer and the insoluble cellulosic polymer are used at a weight ratio of about 0.1:1 to 0.75:1, preferably 0.25:1 to 0.5:1 ofpH sensitive 5 polymer to water insoluble cellulosic polymer. A combined coating weight of about 0.5-5% by weight and preferably 1 to 4% by weight and especially preferred is 1 to 3% by weight of the gained weight based on the weight of the coated tablet core. Cellulose acetate is the preferred water insoluble polymer and the outer coating is preferably applied as a suspension in acetone. 10 Furthermore, a plasticizer or combination of plasticizers may be added to the inner, outer or over coating to provide elasticity and shape to the coating, while the plasticizer or combination of plasticizers may be any water soluble or water insoluble formulation in the range of 0-10% by weight and preferably 0.5 to 5% by weight of the outer coating 15 composition. Acetyltributyl citrate is the preferred plasticizer but materials such as acetyl triethyl citrate, dibutyl phthalate, triacetin, diethyl phthalate, polyethylene glycol, propylene glycol and the like may be utilized. An antioxidant such as BHA or BHT may be added to the tablet core as a stabilizer at 20 a level of 0.001 to 0.01% by weight of the tablet core. Lastly, a channelling agent is mixed with the aforementioned components of the outer coating. A channelling agent may be employed to increase the porosity of the film coating in order- to increase the amount of the fluids that penetrate the tablet core and increase the rate 25 of hydration. This allows the release of the lovastatin after the outer film coat ruptures. Generally, channelling agents may be any salts, surfactants, or short-chain water soluble polymers in a water channel forming effective amount i.e. 1 to 5% by weight, based on the total weight of the core and all coating components. The channeling agents include any pharmaceutically acceptable water soluble salt, surfactant, or short chain water soluble 17 polymer such as sodium chloride, potassium chloride, sucrose, polysorbate-80, hydroxypropyl cellulose, hydroxyethyl cellulose and the like. Also, the preferred embodiment of the inner or over coating is supplied with an anti-5 sticking agent such as talc to overcome any tablet to tablet stickiness during the coating process. The amount of anti-sticking agent is an amount which prevents sticking which may be in the range of 0-6% by weight based on the weight of the tablets and the coating materials on a dry weight basis. 10 Although the applicants do not wish to be bound by any theory by which the invention operates, it is believed that the tablets of the invention release the lovastatin by osmotic pressure. Water is drawn into the tablet and it expands to the point where the outer coating fails in one particular area to form a constricted opening which releases the internal contents of the tablet which contain the drug. Thereafter, the aqueous medium of the tablet shell will 15 continue to release the drug as it dissolves until the osmotic pressure inside the tablet shell equals that of the surrounding environment. At the late stages of the in vivo release of lovastatin, it is believed that the tablet shell will collapse and/or disintegrate completely to substantially completely release the remaining drug. The water insoluble coating is not absorbed in the gastrointestinal tract and is eliminated in the feces. 20 The tablets of the invention may be made in a smooth faced tablet die. Thereafter the tablet is provided with the outer coating which, because of surface tension, will result in a thinner coating layer over the corners of the tablet which will provide an area in the outer coating which will form a channel to is allow intestinal fluid to reach the core of the tablet. 25 18 In certain preferred embodiments, the tablets of the invention will have the following general formula: TABLE 1 INGREDIENTS POSSIBLE RANGE, wt% Tablet Core Alkyl ester of a substituted naphthalene 3-20 Water Swellable Polymer 10-40 Antioxidant 0.001-0.01 Osmotic Agents 20-80 Surfactant 0-5 Lubricant 0-5 Coatings: Seal Coating 0-10 Osmotic Agents 0-10 Inner Coating Enteric Polymer 0-30 Anti-sticking Agent 0-6 Plasticizer 0-6 Channelling Agents 0-6 Outer Coating Blend of Enteric Polymer and Water-insoluble Polymer 0.5-5 Plasticizer(s) 0-1 Channelling Agents 0.2.5 Overcoat Enteric Polymer 0-30 Anti-sticking Agent 0-6 Plasticizer 0-6 Channelling Agents 0-6 TOTAL 100 Other controlled release technologies known to those skilled in the art can be used in order to achieve the controlled release formulations of the present invention, i.e., 40 formulations which provide a mean Tmax of the drug (i.e., a HMG-CoA reductase inhibitor) at the desired time after oral administration, e.g., in general, at about 10 to about 32 hours 19 after oral administration to a population'of human patients, and which preferably provide other pharmacokinetic parameters described herein when orally administered to human patients. Such formulations can be manufactured as a controlled oral formulation in a suitable tablet or multiparticulate formulation known to those skilled in the art. In either case, the controlled release dosage form may optionally include a controlled release carrier which is incorporated into a matrix along with the drug (e.g., HMG-COA reductase inhibitors), or which is applied as a controlled release coating. An oral dosage form according to the invention may be provided as, for example, granules, spheroids, beads, pellets (hereinafter collectively referred to as "multiparticulates") and/or particles. An amount of the multiparticulates which is effective to provide the desired dose of opioid over time may be placed in a capsule or may be incorporated in any other suitable oral solid form. In one preferred embodiment of the present invention, the controlled release dosage form comprises such particles containing or comprising the active ingredient, wherein the particles have diameter from about 0.1 mm to about 2.5 mm, preferably from about 0.5 mm to about 2 mm. Examples of suitable multiparticulate formulations are those in which the particles comprise inert beads which are coated with the drug. Thereafter, a coating comprising the controlled release carrier is applied onto the beads. Alternatively, a spheronizing agent, together with the drug can be spheronized to form spheroids. Microcrystalline cellulose is preferred. A suitable microcrystalline cellulose is, for example, the material sold as Avicel PH 101 (Trade Mark, FMC Corporation). In such embodiments, in addition to drug and spheronizing agent, the spheroids may also contain a binder. Suitable binders, such as low viscosity, water soluble polymers, will be well known to those skilled in the pharmaceutical art. However, water soluble hydroxy lower alkyl cellulose, such as hydroxypropylcellulose, are preferred. Additionally (or alternatively) the spheroids may contain a water insoluble polymer, especially an acrylic polymer, an acrylic copolymer, such as a methacrylic acid-ethyl acrylate copolymer, or ethyl cellulose. 20 In certain embodiments, the particles comprise normal release matrixes containing the drug. These particles are then coated with the controlled release carrier. The controlled release coatings useful in the formulations of the present invention 5 should be capable of producing a strong, continuous film that is smooth and elegant, capable of supporting pigments and other coating additives, non-toxic, inert, and tack-free. In one embodiment, coatings are provided to permit either pH-dependent or pH-independent release, e.g., when exposed to gastrointestinal fluid. A pH-dependent coating serves to release the opioid in desired areas of the gastro-intestinal (GI) tract, e.g., the stomach or small intestine, 10 such that an absorption profile is provided which is capable of providing at least about twelve hour and preferably up to twenty-four hour analgesia to a patient. When a pH-independent coating is desired, the coating is designed to achieve optimal release regardless of pH-changes in the environmental fluid, e.g., the GI tract. It is also possible to formulate compositions which release a portion of the dose in one desired area of the GI tract, e.g., the 15 stomach, and release the remainder of the dose in another area of the GI tract, e.g., the small intestine. Formulations according to the invention that utilize pH-dependent coatings to obtain formulations may also impart a repeat-action effect whereby unprotected drug is coated over 20 the enteric coat and is released in the stomach, while the remainder, being protected by the enteric coating, is released further down the gastrointestinal tract. Coatings which are pH-dependent may be used in accordance with the present invention include shellac, cellulose acetate phthalate (CAP), polyvinyl acetate phthalate (PVAP), hydroxypropylmethylcellulose phthalate, and methacrylic acid ester copolymers, and the like. 25 In certain preferred embodiments, the tablet core or multiparticulates containing the drug are coated with a hydrophobic material selected from (i) an alkylcellulose; (ii) an acrylic polymer; or (iii) mixtures thereof. The coating may be applied in the form of an organic or aqueous solution or dispersion. The coating may be applied to obtain a weight gain from 30 about 2 to about 25% of the substrate in order to obtain a desired sustained release profile. 21 Such formulations are described, e.g., in detail in U.S. Patent Nos. 5,273,760 and 5,286,493, hereby incorporated by reference. Other examples of sustained release formulations and coatings which may be used in accordance with the present invention include U.S. Patent Nos. 5,324,351; 5,356,467, and 5,472,712, hereby incorporated by reference in their entirety. 5 The sustained release coatings of the present invention may also include an exit means comprising at least one passageway, orifice, or the like. The passageway may be formed by such methods as those disclosed in U.S. Patent Nos. 3,845,770; 3,916,889; 4,063,064; and 4,088,864 (all of which are hereby incorporated by reference). The passageway can have any shape such as round, triangular, square, elliptical, irregular, etc. 10 In other embodiments of the present invention, the desired controlled release of the formulation is achieved via a matrix (either normal or controlled release) having a controlled release coating as set forth above. 15 The present invention may also utilize a controlled release matrix that affords in-vitro dissolution rates of the drug within the preferred ranges and that releases the drug in a pH-dependent or pH-independent manner. The materials suitable for inclusion in a controlled release matrix will depend on the method used to form the matrix. The controlled release material which may be included in a matrix in addition to the drug includes hydrophilic 20 and/or hydrophobic materials, such as gums, alkylcelluloses, cellulose ethers, acrylic resins, and protein derived materials. This list is not meant to be exclusive, and any pharmaceutically acceptable hydrophobic material or hydrophilic material which is capable of imparting controlled release of the active agent may be used in accordance with the present invention. 25 The hydrophobic material is preferably selected from the group consisting of alkylcelluloses, cellulose ethers, acrylic and methacrylic acid polymers and copolymers, hydrogenated castor oil, hydrogenated vegetable oil, or mixtures thereof. In certain preferred embodiments of the present invention, the hydrophobic material is a pharmaceutically 30 acceptable acrylic polymer, including but not limited to acrylic acid and methacrylic acid 22 copolymers, methyl methacrylate, methyl methacrylate copolymers, ethoxyethyl methacrylates, cynaoethyl methacrylate, aminoalkyl methacrylate copolymer, poly(acrylic acid), poly(methacrylic acid), methacrylic acid alkylamine copolymer, poly(methyl methacrylate), poly(methacrylic acid)(anhydride), polymethacrylate, polyacrylamide, 5 poly(methacrylic acid anhydride), and glycidyl methacrylate copolymers. In other embodiments, the hydrophobic material is selected from materials such as ethylcellulose. In yet other alternative embodiments, a spheronizing agent, together with the active ingredient can be spheronized to form spheroids. Microcrystalline cellulose is preferred. A 10 suitable microcrystalline cellulose is, for example, the material sold as Avicel PH 101 (Trade Mark, FMC Corporation). In such embodiments, in addition to the active ingredient and spheronizing agent, the spheroids may also contain a binder. Suitable binders, such as low viscosity, water soluble polymers, will be well known to those skilled in the pharmaceutical art. However, water soluble hydroxyalkylcelluloses (such as hydroxypropylcellulose) are pre-15 ferred. Additionally (or alternatively) the spheroids may contain a water insoluble polymer, especially an acrylic polymer, an acrylic copolymer, such as a methacrylic acid-ethyl acrylate copolymer, or ethyl cellulose. In addition to the above ingredients, a controlled release matrix may also contain 20 suitable quantities of other materials, e.g. diluents, lubricants, binders, granulating aids, colorants, flavorants and glidants that are conventional in the pharmaceutical art. The quantities of these additional materials will be sufficient to provide the desired effect to the desired formulation. Specific examples of pharmaceutically acceptable carriers and . excipients that may be used to formulate oral dosage forms are described in the Handbook of 25 Pharmaceutical Excipients. American Pharmaceutical Association (1986), incorporated by reference herein. If necessary to achieve the desired plasma curve (e.g., Tmax), a portion of the drug may be included in the formulations of the invention in immediate release form. For 30 example, the drug may be included in separate normal release matrix particles, or may be co- 23 administered in a different immediate release composition which is either enveloped within a gelatin capsule or is administered separately. In other embodiments, the particles comprise inert beads which are coated with the drug. Thereafter, a coating comprising the controlled release carrier is applied onto the beads, and then an immediate release drug layer is applied 5 on top of the controlled release coating as an overcoat. Alternatively, in controlled release tablet formulations in which the controlled release carrier is included in a matrix with the drug or the controlled release carrier is applied in a coating on the surface of the tablet, a portion of the drug may be applied on the surface of the tablet as an immediate release drug layer (as an overcoat if the tablet has a controlled release coating). 10 Further specific controlled release technologies which may be used in conjunction with the present invention include the Assignee's U.S. Patent Nos. 5,837,379; 5,34,023; 5,830,503; 5,736,159; 5,728,402; 5,654,005; 5,567,441; 5,558,879; 5,532,275; 5,508,040; 5,472,708; 5,458,888; 5,458,887; and 5,419,917, all of which are hereby incorporated by 15 reference. DESCRIPTION OF THE PREFERRED EMBODIMENTS The following examples illustrate various aspects of the present invention. They are 20 not to be construed to limit the claims in any manner whatsoever. EXAMPLE 1 A tablet having the following formula was prepared: 25 lovastatin 11.99wt% 40.0mg Polyox WSR Coagulant, NF* 4.50wt% 15.0mg Polyox WSR N 80, NF** 17.98wt% 60.0mg lactose (anhydrous) 50.65wt% 169.0mg sodium lauryl sulfate 3.00wt% lO.Omg 30 silicon dioxide Fumed USP/NF 0.45wt% 1.5mg 24 Myvaplex 600P*** 1.80wt% 6.0mg * polyethylene oxide Mw No av 5,000,000 ** polyethylene oxide Mw No av 200,000 *** glyceryl monostearate Seal Coating: Opadry Clear**** sodium chloride 2.81wt% 0.93wt% 9.4mg 3-lmg 10 **** mixture containing hydroxypropyl methyl cellulose and polyethylene glycol Inner Coating: hydroxypropylmethylcell. phthal.55 2.27wt% 7.58mg talc 0.78wt% 2.6mg 15 acetyl tributyl citrate 0.22wt% 0.75mg sugar, confectioners 6X micronized 0.62wt% 2.08mg Outer Coating: cellulose acetate 1.00wt% 3.32mg Eudragit S 1001 0.3 4wt% 1.13mg 20 Triacetin 0.08wt% 0.27mg polyethylene glycol 400 0.08wt% 0.27mg sugar, confectioners 6X micronized 0.50wt% 1.66mg 100.0wt%333.66mg 1 Eudragit S 100 (poly(methacrylic acid, methylmethacrylate, 1:2 ratio MW (No. Av. 25 135,000-USP Type B) 30 The following describes the process of making the above described dosage form: STEP 1, THE TABLET CORE (a) Granulation 25 1. Pass Polyox WSR N80, sodium lauryl sulfate and anhydrous lactose through a 30 mesh stainless steel screen. 2. Charge the screened materials and lovastatin (micronized) into a vertical granulator. 3. Dissolve butylated hydroxy anisole in ethanol. 5 4. Mix ethanol, and purified water. 5. Pre-mix the powder mixture for 5 minutes. 6. Blend the powder mixture again, add the butylated hydroxyanisole solution and then the ethanol/water mixture. 7. Dry the granules at 45-50°C until the moisture content is lower than 1,8wt%. 10 8. Pass the granules through a 1575 mesh using a Comil. Tabletting 1. Mix Cab-O-Sil and Polyox WSR N80. 15 2. Pass the mixture of Cab-o-Sil and Polyox WSR N80 through a 24 mesh stainless steel screen with the Polyox WSR Coagulant. 3. Blend the screen materials with lovastatin granules for 15 minutes. 4. Pass Myvaplex through a 30 mesh stainless steel screen and combine with the other screen materials. 20 5. Blend for five minutes. 6. Compress the blend into tablets (300mg, round, standard concave, 11/32") which contain 40mg of lovastatin. Seal Coating: Opadry Clear 25 1. Dissolve sodium chloride in purified water. 2. Disperse Opadry Clear into the sodium chloride solution. 3. Spray lovastatin tablets with the aqueous coating suspension using a c6ater. 30 Inner Coating: Hydroxypropyl methylcellulose phthalate 55 26 1. Dissolve hydroxypropyl methylcellulose phthalate 55 in acetone using a homogenizer. 2. Add acetyl tributyl citrate to the acetone solution and mix it with a homogenizer until a homogenized dispersion is obtained. 3. Add talc and sugar to the solution and mix it with a homogenizer until a homogenized 5 dispersion is obtained. 4. Replace the homogenizer with a magnetic mixer and stir the coating mixture throughout the coating process. 5. Spray the Opadry Clear coated lovastatin tablets with the coating dispersion in a coater. 10 Outer Coating: cellulose acetate 1. Dissolve cellulose acetate and Eudragit SI00 in acetone using a homogenizer. 2. Add polyethylene glycol 400, triactein and sugar to the solution and mix until a 15 homogeneous dispersion is obtained. 3. Spray the coating suspension onto the tablets in a coater. Release in the above described manner will result in the dissolution profile shown in FIG. 1, which is a graph of in vitro dissolution data which shows the dissolution profile of the 20 formulation of Example 1 in 2% sodium lauryl sulfate at pH 7.0 in NaH2P04 buffer in a USP XXH Type II dissolution apparatus at 50 rpm at 37°C. It is believed that administration of the above described micronized Lovastatin in these amounts will be particularly effective in inhibiting the biosynthesis of cholesterol in the 25 liver through interruption of HMG coenzyme A reductase. The dosage of lovastatin should be individualized depending on the desired and/or degree of serum cholesterol that is desired. Generally 10 to 80mg of lovastatin per day should be administered by mouth depending on the response and the degree of reduction in serum cholesterol level that is indicated. 30 27 EXAMPLE 2 A tablet having the following formula was prepared: 10 lovastatin Polyox WSR Coagulant, NF* Polyox WSR N 80, NF** lactose (anhydrous) sodium lauryl sulfate silicon dioxide Fumed USP/NF butylated hydroxy anisole Myvaplex 600P*** 12.11wt% 4.54wt% 17.71wt% 51.13wt% 3.03t% 0.45wt% 0.03wt% 1.82wt% 40.0mg 15.0mg 58.5mg 168.9mg lO.Omg 1.5mg 0.1 Omg 6.0mg 15 * polyethylene oxide Mw No av 5,000,000 ** polyethylene oxide Mw No av 200,000 *** glyceryl monostearate 20 Seal Coating: Opadry Clear**** sodium chloride 2.85wt% 0.94wt% 9.4mg 3.1mg **** mixture containing hydroxypropyl methyl cellulose and polyethylene glycol 25 Inner Coating: hydroxypropylmethylcell. phthal.55 talc acetyl tributyl citrate sugar, confectioners 6X micronized 2.29wt% 0.79wt% 0.23wt% 0.08wt% 7.58mg 2.6mg 0.75mg 0.27mg 30 28 Outer Coating: cellulose acetate 1.00wt% 3.32mg Eudragit S 100 0.34wt% 1.13mg triacetin 0.08wt% 0.27mg polyethylene glycol 400 0.08wt% 0.27mg sugar, confectioners 6X micronized 0.50wt% 1.66mg 100.0wt% 330.35mg 1 Eudragit S 100 (poly(methacrylicacid, methylmethacrylate, 1:2 ratio MW (No. Av. 135,000 10 -USP TypeB) Coated tablets were prepared using the general procedure of Example 1, except that an indentation was made on the tablet surface. 15 EXAMPLE 3 A tablet having the following formula was prepared: lovastatin 12.14wt% 20.0mg Polyox WSR Coagulant, NF* 4.55wt% 7.5mg Polyox WSRN 80, NF** 17.76wt% 29.25mg lactose (anhydrous) 51.30wt% 84.5mg sodium lauryl sulfate 3.04wt% 5.0mg silicon dioxide Fumed USP/NF 0.46wt% 0.75mg butylated hydroxy anisole 0.03wt% 0.05mg Myvaplex 600P*** 1.82wt% 3.0mg * polyethylene oxide Mw No av 5,000,000 ** polyethylene oxide Mw No av 200,000 30 *** glyceryl monostearate 29 Seal Coating: Opadry Clear**** 3.42wt% 5.63mg sodium chloride 1.14wt% 1.88mg **** mixture containing hydroxypropyl methyl cellulose and polyethylene glycol Outer Coating: 10 cellulose acetate Eudragit S 100' triacetin polyethylene glycol 400 sugar, confectioners 6X micronized 1.43wt% 0.49wt% 0.11wt% 0.11wt% 0.72wt% 2.36mg 0.80mg 0.19mg 0.19mg 1.18mg 15 Overcoat: 20 hydroxypropylmethylcell. phthal.55 talc triacetin sugar, confectioners 6X micronized 0.77wt% 0.30wt% 0.12wt% 0.30wt% 1.27mg 0.49mg 0.20mg 0.49mg 100.0wt% 146.73mg 25 1 Eudragit S 100 (poly(methacrylic acid, methylmethacrylate, 1:2 ratio MW (No. Av. 135,000-USP TypeB) The following describes the process of making the above described dosage form: 30 STEP 1, THE TABLET CORE (a) Granulation 30 1. Pass Polyox WSR N80, sodium lauryl sulfate and anhydrous lactose through a 30 mesh stainless steel screen. 2. Charge the screened materials and lovastatin (micronized) into a vertical granulator. 3. Dissolve butylated hydroxy anisole in ethanol. 5 4. Mix ethanol and purified water. 5. Pre-mix the powder mixture for 5 minutes. 6. Blend the powder mixture again, add the butylated hydroxyanisole solution and then the ethanol/water mixture. 7. Dry the granules at 45-50°C until the moisture content is lower than 1.8wt%. 10 8. Pass the granules through a 1575 mesh using a Comil. Tabletting 1. Mix Cab-O-Sil and Polyox WSR NBO. 15 2. Pass the mixture of Cab-O-Sil and Polyox WSR N80 through a 24 mesh stainless steel screen with the Polyox WSR Coagulant'. 3. Blend the screen materials with lovastatin granules for 15 minutes. 4. Pass Myvaplex through a 30 mesh stainless steel screen and combine with the other screen materials. 20 5. Blend for five minutes. 6. Compress the blend into tablets (164.72mg, round, standard concave, 17/6411 dia.) which contain 20mg of lovastatin. Seal Coating: Opadry Clear 25 1. Dissolve sodium chloride in purified water. 2. Disperse Opadry Clear into the sodium chloride solution. 3. Spray lovastatin tablets with the aqueous coating suspension using a coater. 30 Inner Coating: None 31 • 10 15 20 25 Outer Coating: cellulose acetate 1. Dissolve cellulose acetate and Eudragit S100 in acetone using a homogenizer. 2. Add polyethylene glycol 400, triactein and sugar to the solution and mix until a homogeneous dispersion is obtained. 3. Spray the coating suspension onto the tablets in a coater. Overcoating". Hydroxypropyl methylcellulose phthalate 55 1. Dissolve hydroxypropyl methylcellulose phthalate 55 in acetone using a homogenizer. 2. Add acetyl tributyl citrate to the acetone solution and mix it with a homogenizer until a homogenized dispersion is obtained. 3. Add talc and sugar to the solution and mix it with a homogenizer until a homogenized dispersion is obtained. 4. Replace the homogenizer with a magnetic mixer and stir the coating mixture throughout the coating process. 5. Spray the Opadry Clear coated lovastatin tablets with the coating dispersion in a coater. EXAMPLE 4 A tablet having the following formula was prepared: lovastatin 12.20wt% 20.0mg Polyox WSR Coagulant, NF* 4.57wt% 7.5mg Polyox WSR N 80, NF** 17.84wt% 29.25mg lactose (anhydrous) 51.53wt% 84.5mg sodium lauryl sulfate 3.05wt% 5.0mg silicon dioxide Fumed USP/NF 0.46% 0.75mg butylated hydroxy anisole 0.03wt% 0.05mg Myvaplex 600P*** 1.83wt% 3.0mg 32 * polyethylene oxide Mw No av 5,000,000 ** polyethylene oxide Mw No av 200,000 *** glyceryl monostearate • 10 15 20 25 Seal Coating: Opadry Clear**** 3.43wt% 5.63mg sodium chloride 1.15wt% 1.88mg **** mixture containing hydroxypropyl methyl cellulose and polyethylene glycol Inner Coating: None Outer Coating: cellulose acetate 1.96wt% 3.21mg Eudragit S 1001 0.66wt% 1.09mg acetyl tributyl citrate 0.32wt% 0.52mg sugar, confectioners 6X micronized 0.98wt% 1.61mg 100.00wt% 163.99mg Coated tablets were prepared using the general procedure of Example 3 except that no inner coating was applied and an outer enteric coating was applied as an overcoat over the outer layer. A comparison of Examples 2, 3 and 4 shows that the following was the weight of the coatings that were applied: Example 2 Inner Coating 4wt% Outer Coating 2wt% Over Coating 0% Example 3 Inner Coating 0% 33 Outer Coating 3wt%~ Over Coating 2.5% Example 4 Inner Coating Owt% Outer Coating 4wt% Over Coating Owt% FIG. 2 is a graph of in vitro dissolution data which shows the dissolution profiles of the formulations of Examples 2, 3 and 4 in 2% sodium lauryl sulfate at pH 7.0 in NaH2P04 buffer in a USP XXH Type II dissolution apparatus at 50 rpm at 37°C. It is believed that administration of the above described micronized Lovastatin in these amounts will be particularly effective in inhibiting the biosynthesis of cholesterol in the liver through interruption of HMG coenzyme A reductase. The dosage of lovastatin should be individualized depending on the desired and/or degree of serum cholesterol that is desired. Generally 10 to 80mg of lovastatin per day should be administered by mouth depending on the response and the degree of reduction in serum cholesterol level that is indicated. EXAMPLES 5-7 In Examples 5-7, 40mg lovastatin tablets were prepared using the general procedure of Example 1. The ingredients of Examples 5-7 are set forth in Table 2 below. TABLE 2 Summary of Lovastatin Formulations Ingredient Weight Percent Example 5 £ Example 6 Example 7 Lovastatin (strength, mg) 40 40 40 34 10 15 20 25 Tablet Core - 1. Lovastatin 12.11 12.28 12.28 2. Lactose (Anhydrous) 51.13 51.8 51.8 3. Polyox® WSR Coagulant 4.54 4.6 4.6 4. Polyox® WSR N80 17.71 17.94 17.94 5. Sodium Lauryl Sulfate 3.03 3.06 3.06 6. Glyceryl Monostearate 1.82 1.84 1.84 7. Silicon Dioxide 0.45 0.46 0.46 8. Butylated Hydroxyanisole 0.03 0.02 0.02 Seal Coat 1. Opadry Clear 2.85 2.88 2.88 2. Sodium Chloride Powder 0.94 0.96 0.96 Inner Coat l.HPMCP 55 2.29 1.61 1.61 2. Talc, USP 0.79 0.55 0.55 3. Acetyltributyl Citrate 0.23 0.16 0.16 4. Sugar, Micronized 0.64 0.44 0.44 Outer Coat 1. Cellulose Acetate 1 0.7 0.7 2. Eudragit SI00 0.34 0.24 0.24 3. Triacetin 0.08 0.06 0.06 4. Polyethylene Glycol 400 0.08 0.6 0.6 5. Acetyltributyl Citrate - - - 6. Sugar, Micronized 0.5 0.35 0.35 Overcoat 1.HPMCP 55 2. Talc, USP 3. Triacetin 4. Sugar, Micronized - - - 35 5. Opadry Yellow 6. Opadry Pink ~ - - Total Tablet Weight, % 100 100 100 5 As can be ascertained from Table 2, Example 5 has the same composition as Example 2. However, the tablets of Example 5 do not contain the indentation in the tablet surface that was present in Example 2. Preliminary results of a single-dose study in healthy humans indicated that the indentation in the lovastatin formulation of Example 2 did not improve its 10 pharmacokinetics. Because Example 5 provided the desired safety, efficacy and pharmacokinetic profiles in Studies 1-3 described in detail herein, two more clinical lots were made based on the composition and process of Example 5. Examples 6 and 7 are the two clinical lots made based on the composition of Example 5. A different coater (Glatt coater GPCG3) was used for the manufacturing of these two lots. Since the new coater had a better 15 coating efficiency, less coating mixtures was required to achieve the same dissolution as that of Example 5. Considering the similarity of the dissolution profiles and the identical coating mixture composition, the "actual composition" of Examples 6 and 7 should be very similar to that of Example 5. 20 EXAMPLES 8 - 9 In Example 8, 20mg lovastatin tablets were prepared. In Example 9, lOmg lovastatin tablets were prepared. Both formulations were prepared using the general procedure of Example 1. 25 The composition of Example 9 is the same as Example 8, except that lOmg of lactose has been used to replace lOmg of drug substance (lovastatin). The ingredients of Examples 8-9 are set forth in Table 3 below. 30 36 TABLE 3 5 Summary of Lovastatin Formulations Weight Percent Ingredients Example 8 Example 9 10 Lovastatin (strength, mg) 20 10 Tablet Core 1. Lovastatin 11.69 5.84 2. Lactose (Anhydrous) 49.32 55.18 15 3. Polyox® WSR Coagulant 4.38 4.38 4. Polyox® WSR N80 18.08 17.09 5. Sodium Lauryl Sulfate 2.92 2.92 6. Blyceryl Monostearate 1.75 1.75 7. Silicon Dioxide 0.44 0.44 20 8. Butylated Hydroxyanisole 0.02 0.01 37 5 15 20 Seal Coat 1. Opadry Clear 2.74 2.74 2. Sodium Chloride Powder 0.91 0.91 t Inner Coat l.HPMCP 55 2.21 2.21 2. Talc, USP 0.76 0.76 3. Acetyltributyl Citrate 0.22 0.22 4. Sugar, Micronized 0.61 0.61 Outer Coat 1. Cellulose Acetate 0.97 0.97 2. Eudragit S 100 0.33 0.33 3. Triacetin 0.08 0.08 4. Polyethylene Glycol 400 0.08 0.08 5. Acetyltributyl Citrate - - 6. Sugar, Micronized 0.49 0.49 Overcoat l.HPMCP 50 - - 2. Talc - - 3. Triacetin - - 4. Sugar, Micronized - - 5. Opadry Yellow 3 3 6. Opadry Pink - - Total Tablet Weight % 100 100 30 Each of Examples 5-9 were evaluated by dissolution testing under the following conditions: USP apparatus 2 (paddles); medium: 2% SLS/sodium phosphate buffer (0.01M), i pH 7.0, stir speed 50 rpm, and temperature 37°C. The dissolution profile for Examples 2 and 5-7 are illustrated in Figure 3. The dissolution profiles for Examples 3,4 and 8 are illustrated 35 in Figure 4. The dissolution profile for Example 9 is illustrated in Figure 5. The dissolution 38 profiles of Examples 5-7 and 2 are further provided in Table 4 below. The dissolution profiles of Examples 3,4,8 and 9 are further provided in Table 5 below. TABLE 4 Time (Hours) Ex.5 Ex. 6 Ex.7 Ex. 2 0 0 0 0 0 0.5 0 0 0 0 1 1 1 1 0 2 12 14 13 1 3 29 32 30 11 4 44 48 46 27 6 67 72 72 55 8 80 82 83 72 12 86 86 88 84 16 90 86 89 87 20 90 85 89 87 30 TABLE 5 35 40 45 Time (Hours) Ex. 3 Ex.4 Ex. 8 Ex.9 0 0 0 0 0 0.5 5 0 0 0 1 15 0 0 1 2 36 4 4 6 4 70 18 33 39 6 86 37 65 67 8 90 54 82 80 12 92 78 89 86 16 99 85 92 88 20 99 87 92 89 39 CLINICAL STUDIES Oral Pharmacokinetics Studies were conducted to evaluate the formulations of Examples 5-9 (hereinafter collectively referred to as "Lovastatin XL™"). In certain of these studies, an immediate release tablet of lovastatin commercially available for more than 10 years (Mevacoi®, Merck & Co., Inc.) was used as a reference standard. Study No. 1 was a pharmacokinetics, safety and tolerability open-label, single dose, two-period crossover study of 40 mg Lovastatin XL tablets (Example 5) in comparison to Mevacor. There were 8 healthy male volunteers. The dose of Lovastatin XL and Mevacor was administered at 6:30 p.m., immediately after dinner. Study No. 2 was a safety, pharmacokinetics and effect of food open-label, single dose, three-period crossover study comparing Lovastatin XL tablets (Example 5) to Mevacor. There were 9 healthy male volunteers. The dose of Lovastatin XL was administered at 8:00 a.m. (fasting), 8:00 a.m. immediately after breakfast (fed conditions), in comparison to Mevacor administered at 8:00 a.m., immediately after breakfast. Study No. 3 examined the safety and pharmacokinetics of Lovastatin XL tablets (Example 5 and Example 2) in an open-label, single-dose, two-period crossover. There were 6 healthy male volunteers. The doses of Lovastatin XL were administered at 8 a.m., immediately after breakfast. Study No. 4 was a multiple-dose, safety, tolerability, efficacy, pharmacodynamics and pharmacokinetics single-blind, 4-week active treatment, 2-period cross-over study with a 4-week diet/placebo run-in period in which 40 mg Lovastatin XL tablets (Example 5) were compared to Mevacor 40 mg tablets. Patients had a diet/placebo run-in period of 4 weeks 40 prior to randomization to the active treatment. A total of 24 patients were randomized to receive 40 mg/day of Lovastatin XL, or 40 mg/day of Mevacor once daily in active treatment Period I and was switched to the alternate treatment drug in Period II. The Lovastatin XL tablets were administered on a once-daily basis for 4 weeks at about 10:00 p.m. The Mevacor tablets were administered once daily for 4 weeks at about 6 p.m., immediately after dinner. There was a two week placebo washout period between treatments. Of the 24 patients with hypercholesterolemia, 12 were male and 12 were female, and 13 of the subjects participated in the pharmacokinetic substudy. The results are summarized in Table 6. Study No. 5 examined the oral pharmacokinetics, pharmacodynamics and safety of 10 mg, 20 mg and 40 mg Lovastatin XL tablets (Examples 9, 8 and 5, respectively). The study design was single-dose, 3-period cross-over, with 8 healthy male volunteers. Each of these dosages were administered at bedtime (about 10:00 p.m.). Tables 6 and 7 provide mean pharmacokinetic values (for lovastatin and lovastatin acid, respectively) for both Lovastatin XL and Mevacor for Study Nos. 1-5. Table 8 provides mean AUC and Cmax ratios for the 40mg tablets in Study Nos. 1, 2 and 4. Table 9 provides pharmacokinetic data (mean AUC and Cmax ratios) for Lovastatin XL 40mg doses for Study Nos. 1,2 and 5. FIG. 6 is a graph of Study 1 of comparative data which shows mean (±SD) plasma concentration time profiles of lovastatin in healthy subjects (n=8) following a single oral dose of a conventional immediate release dose of 40mg of lovastatin and an extended release 40mg dose of lovastatin according to the invention (Example 5). FIG. 7 is a graph of Study 1 of comparative data which shows mean (±SD) plasma concentration time profiles of lovastatin acid in healthy subjects (n=8) following a single oral dose of a conventional immediate release dose of 40mg of lovastatin and an extended release 40mg dose of lovastatin according to the invention (Example 5). FIG. 8 is a graph of Study 2 comparative data which shows mean (±SD) plasma concentration time profiles of lovastatin in healthy subjects (n=9) following a single oral dose in the morning of a conventional immediate release dose of 40mg of lovastatin with breakfast and an extended release 40mg dose of lovastatin according to the invention (Example 5) with and without breakfast. FIG. 9 is a graph of Study 2 of comparative data which shows mean (±SD) plasma concentration time profiles of lovastatin acid in healthy subjects (n=9) following a single oral dose in the morning of a conventional immediate release dose of 40mg of lovastatin with breakfast and an extended release 40mg dose of lovastatin according to the invention (Example 5) with and without breakfast. The mean AUC values for lovastatin acid, active and total inhibitors at steady state were similar for both Lovastatin XL and Mevacor (Tables 7 and 8). From the results of these studies, it was found that when compared to Mevacor and regardless of dosing time, Lovastatin XL had higher bioavailability of inactive prodrug (lovastatin), as reflected by mean AUC values and by geometric mean AUC ratios of lovastatin which were greater than unity, after administration of a single dose (Table 6). Geometric AUC ratios for the acid were close to unity (Table 7). As can be ascertained from the results provided in Table 10, ingestion of a high-fat breakfast prior to the administration of Lovastatin XL reduced the AUCo^ and Cmax values of lovastatin and lovastatin acid by approximately 40-50%. Thus, a high-fat meal decreased the rate and extent of absorption of lovastatin and lovastatin acid after administration of Lovastatin XL. Efficacy Study No. 4 was designed to evaluate the safety, efficacy, pharmadynamics, pharmacokinetics, and tolerability of Lovastatin XL relative to MEVACOR after multiple-dose treatment in patients with fasting plasma LDL-cholesterol levels between 130 and 250 mg/dl and triglyceride levels below 350 mg/dl. This study had a single-center, single-blind, randomized, two-way crossover design. Patients had a diet/placebo run-in period of 4 weeks prior to randomization to the active treatment. A total of 24 patients were randomized to receive 40 mg/day of lovastatin to the alternate treatment drug in Period II. During the active treatment periods, patients were instructed to take Lovastatin XL daily in the evening at 42 approximately 10:00 p.m. for 4 weeks, or MEVACOR daily with the evening meal (about 6:00 p.m.) for 4 weeks. There was a two-week placebo washout period between treatments. The multiple-dose pharmacokinetics of Lovastatin XL studied in patients in Study No. 5 4 are depicted in Figures 10 and 11 and in Table 11. FIG. 10 is a graph of the mean plasma concentration-time profiles of lovastatin and lovastatin acid in patients (n=12) after multiple-dose administration of 40mg Lovastatin XL and a conventional 40mg immediate release dose of lovastatin (Study No. 4, Day 1 and Day 28). FIG. 11 is a graph of the mean plasma concentration-time profiles of total and active inhibitors of HMG-CoA Reductase in 10 patients (n=12) after multiple-dose administration of 40mg Lovastatin XL and a conventional 40mg immediate release dose of lovastatin (Study No. 4, Day 1 and Day 28). The mean plasma concentration-time profiles of lovastatin, lovastatin acid, and total and active inhibitors of HMG-CoA reductase following administration of 40 mg/day of 15 Lovastatin XL for four weeks exhibited extended release characteristics, as depicted in - Figures 10 and 11 and in Table 11. Table 12 provides the Least Squares Means - % change in LDL-Cholesterol, HDL-Cholesterol, Total Cholesterol and Triglycerides of Study No. 4. The increased systemic bioavailability of lovastatin when administered as the XL formulation was not accompanied by increased bioavailability of lovastatin acid, active or total inhibitors. The 20 mean plasma concentration-time profiles of these compounds following administration of 40 mg/day of Mevacor for four weeks exhibited immediate-release characteristics. No accumulation was observed with Mevacor. As can be ascertained from these results, the accumulation of lovastatin and its latent and active metabolites after chronic once-daily administration of Lovastatin XL was approximately 1.4- to 2-fold. The primary efficacy 25 endpoints defined by the protocol were the changes from baseline of blood lipid values at weeks 3 and 4 (combined) of treatment. Values were also calculated for Weeks 3 and 4 individually and were not combined if the treatment-by-time interaction was significant. Results of this study demonstrated that Lovastatin XL lowered LDL-cholesterol 4.4 ■ percentage points more (p = 0.0605) than MEVACOR at Week 3, 3.6 percentage points more 30 (p = 0.0737) at Week 4, and 3.9 percentage points more (p = 0.0435) when Weeks 3 and 4 are 43 combined (Table 9). When compared with MEVACOR, mean Lovastatin XL HDL-cholesterol values increased 2.7 percentage points more (p = 0.2588) at Week 3 and 3.0 percentage points more (p = 0.2741) at Week 4 of each treatment period, and 3.0 percentage points more (p = 0.1402) with Week 3 and 4 combined. Mean Lovastatin XL total cholesterol values decreased 3.4 percentage points more (p = 0.0245) at Week 3,1.7 percentage points more (p = 0.3422) at Week 4, and 2.5 percentage points more (p = 0.0721) with Week 3 and 4 combined. Mean Lovastatin XL triglyceride values decreased 101.2 percentage points more (p = 0.1067) at Week 3, but increased 3.1 percentage points more (p = 0.5297) at Week 4. Lovastatin XL, at 40 mg daily, produced 41 percent lowering in mean LDL-cholesterol. The magnitude of this reduction was 3.9 percentage points greater (p -0.0435, based on combined Weeks 3 and 4 data) than was produced by an equal dose of MEVACOR. Based on the well-recognized dose-response relationship that doubling the dose of a statin produces approximately a 6 to 7 percentage point further decline in LDL-cholesterol, the 3.9 percentage point differential observed in this trial would, if reproducible, translate to the response expected from a dosage equivalent of MEVACOR of more than 60 In TABLE 6 Mean + SD Values of AUC, Cmx and TTOJ of Lovastatin AUC0.48hr (ng»hr/ml) cnux (ng/ml) (hr) Lovastatin XL MEVACOR Lovastatin XL MEVACOR Lovastatin XL MEVACOR 1 with Dinner/Single Dose 8 33.9+11.8* 26.6+17.0* 3.15+1.24 6.13+2.56 15.5+5.1 2.1+0.6 2 '•with Breakfast/Single Dose 9 54.7+27.7 33.1 + 10.4 3.09+1.48 6.72+2.75 24.0+7.9 2.4+0.9 Fasting/Single Dose 9 90.5+50.0 - 4.86+1.99 — 11.1+5.8 -- 3 with Breakfast/Single Dose 6 78.7+37.9 ... 4.01+2.47 — 16.3+6.4 -- 4 Bedtime/Single Dose 12 49.9+23.5* 4.0+2.0 16.9+6.3 with Dinner/Single Dose 12 - 33.7+21.6* - 6.7+4.0 - 3.0+1.5 Bedtime/Multiple Dose 12 76.6+36.9* - 5.5+2.5 -- 14.2+7.6 - with Dinner/Multiple Dose 12 - 44.7+46.2* — 7.8+8.1 — 3.3+2.2 5 Bedtime/Single Dose (40 mg) 8 53.94+35.55 . 4.03+3.02 __ 14.3+4.5 5 Bedtime/Single Dose (20 mg) 8 34.1+13.7 — 2.03+0.65 13.5+2.8 5 Bedtime/Single Dose (10 mg) 8 14.59+7.78 — 1.04+0.43 — 12.8+2.1 — *AUC0.24hr TABLE 7 Mean + SD Values of AUC, Cmx and T „„„ of Lovastatin Acid AUC0.,ellr (ng»hr/ml) CTOX (ng/ml) (hr) Study Dosing Time/Dose n No. Lovastatin XL MEVACOR Lovastatin XL MEVACOR Lovastatin XL MEVACOR 1 with Dinner/Single Dose 8 47.5+18.9* 42.2+20.3* 4.64+1.89 6.45+4.09 13.8+3.8 3.9+1.0 2 with Breakfast/Single Dose 9 50.3+35.6 41.6±35.1 2.50+1.45 6.88+5.81 20.9+7.8 2.4+0.9 Fasting/Single Dose 9 91.2+59.6 - 4.90+2.32 — 14.7+5.9 - i 3 with Breakfast/Single Dose 6 42.8+12.9 — 2.52+0.97 — 18.7+4.5 4 Bedtime/Single Dose 12 38.6+31.4* -- 2.9+2.5 - 14.5+5.3 -- with Dinner/Single Dose 12 - 84.1+63.1* -- 11.7+6.9 -- 5.7+1.2 Bedtime/Multiple Dose 12 87.1+67.2* - 5.8+4.8 - 11.8+7.4 - with Dinner/Multiple Dose 12 — 82.5+60.3* — 11.9±10.2 — 5.3+1.0 6 Bedtime/Single Dose (40 mg) 8 71.25+61.29 — 3.85+2.68 — 13.0+7.7 — *AUC0_2<H,r TABLE 8 Mean+ SD Value of AUC, Cmax and Tmax of Total and Active HMG-CoA Reductase Inhibitors Total HMG-CoA Reductase Inhibitors Study No. Dosing Time/Dose n AUCa^r (ng«hr/ml) Cm (ng/ml) T A max (hr) Lovastatin XL MEVACOR Lovastatin XL MEVACOR Lovastatin XL MEVACOR 5 Bedtime/Single Dose with Dinner/Single Dose Bedtime/Multiple Dose with Dinner/Multiple Dose 12 12 12 12 136.3+73.3 262.6+159.4 226.9+100.4 251.6+154.1 10.5+5.8 17.3+8.1 31.4+9.4 36.2+20.7 17.3+4.3 13.2+9.4 3.7+2.3 — ( 3.9+2.0 Active HMG-CoA Reductase Inhibitors Study No. Dosing Time/Dose n AUC0.48hr (ng»hr/inl) C_ (ng/ml) T™ (hr) Lovastatin XL MEVACOR Lovastatin XL MEVACOR Lovastatin XL MEVACOR 5 Bedtime/Single Dose 12 83.3+44.7 - 6.4+4.3 - 15.2+4.9 - with Dinner/Single Dose 12 - 178.9+82.9 - 22.4+6.6 - 4.4+2.4 Bedtime/Multiple Dose 12 171.3+122.9 - 13.4+9.1 - 9.5+3.3 - with Dinner/Multiple Dose 12 - 185.9+100.4 - 26.6+14.2 - 4.2+2.1 TABLE 9 •" Mean AUC and Cmax Ratios (40-mg Dose) [Study Nos. 1,2 and 5] Mean AUC0.24hr Ratio' Mean C^ Ratio" Dosing Time/Dose Lovastatin Lovastatin Acid Total Inhibitors Active Inhibitors Lovastatin Lovastatin Acid Total Inhibitors Active Inhibitors Breakfast/ Single Dose (Study 2) 1.56b 1.246 - - 0.76 0.76 - Dinner Time/Single Dose (Study 1) 1.41 1.14 — 0.51 0.77 Bedtime (XL) & Dinner (MEVACOR)/ Single Dose (Study 5) 1.49 0.46 0.56 0.46 0.62 0.23 0.29 0.25 Bedtime (XL) & Dinner (MEVACOR)/ Multiple Dose (Study 5) 1.91 0.86 0.96 0.84 0.84 0.43 0.48 0.47 a Ratio = Lovastatin XL/MEVACOR b Mean AUC0.4Bhr Ratio TABLE 10 Effect of Food on Pharmacokinetics of Lovastatin and Lovastatin Acid [Study No. 2] 5 Lovastatin Treatment AUC0-(8tlr (nR»hr/ml) (ng/ml) T,ae (hr) T™ (hr) 10 Lovastatin XL without breakfast 90.0+50.0 4.86+1.99 1.9+0.6 11.1+5.8 15 Lovastatin XL after breakfast Geometric Mean Ratio" 54.7+27.7 0.60 3.09+1.48 0.61 2.7+1.1 24.0+7.9 i Lovastatin Acid 20 Ik Treatment AUC0-18hr (ng*hr/ml) (ng/ml) T„s (hr) T™, (hr) Lovastatin XL without breakfast 91.2±59.6 4.90+2.32 2.1+0.4 14.7+5.9 25 Lovastatin XL after breakfast 50.3±35.6 2.50+1.45 2.8+1.0 20.9+7.8 GeometricMean Ratio" 0.54 0.49 -- — ' Ratio = Lovastatin XL after breakfast/Lovastatin XL without breakfast 30 Dose Proportionality Study No. 5 was conducted in healthy volunteers receiving separately single oral doses of 10, 20 and 40 mg of Lovastatin XL. Results of this study indicated that, as the dose of Lovastatin XL increased from 10 to 40 mg, the AUC0.48hr and Cmax values of lovastatin appeared to increase linearly (see results for Study No. 5 depicted in Table 6). Figure 12 is a graph of a regression line depicting Cmax plotted against dose for Study No. 5. Figure 13 is a graph of a regression line depicting AUCM8hr plotted against dose for Study No. 5. 50 TABLE 11 Mean +SD (n=12) Values of AUC0-24hr (ng»hr/ml or ng eq»hr/ml) and Cmax (ng/ml or ng eq/ml) after Multiple Oral Doses of Lovastatin XL [Study No. 5] AUC0_24hr c Day 1 Day 28 R* Day 1 Day 28 R* Lovastatin 49.9+23.5 76.6+36.9 1.48 4.0+2.0 5.5+2.5 1.36 Lovastatin acid 38.7+31.4 87.1+67.2 1.88 2.9+2.5 5.8+4.8 1.70 Total of inhibitors of HMG-CoA reductase 136.3+73.3 262.6+159.4 1.82 10.5+5.8 17.3+8.1 1.71 Active inhibitors of HMG-CoA reductase 83.3+44.7 171.3+122.9 1.86 6.4+4.3 13.4+9.1 2.06 * R = Geometric mean ratio of or AUC0.24hr on Day 28 to that on Day 1. 5 10 15 20 25 TABLE 12 Least Squares Means % Change in LDL-CholesteroI, HDL-Cholesterol, Total Cholesterol, and Triglycerides [Study No. 4] Parameter Week n Lovastatin MEVACOR Difference p-value XL LDL-C 3 24 -40.60 -36.19 -4.41 .0605 4 22 -42.48 -38.86 -3.62 .0737 3&4 24 -41.32 -37.45 -3.87 .0435* HDL-C 3 24 +7.73 +5.06 +2.67 .2588 4 22 +8.81 +5.77 +3.04 .2741 3&4 24 +8.19 +5.18 +3.01 .1402 3 24 -27.80 -24.44 -3.36 .0245* Total-C 4 22 -29.27 -27.60 -1.67 .3422 3&4 24 -28.48 -25.99 -2.48 .0721 Trigylcerides 3 24 -20.53 -10.33 -10.20 .1067 4 22 -21.02 -24.14 +3.12 .5297 30 ♦Significant at p<0.05 Analytical Methods 35 Concentrations of lovastatin and lovastatin acid in plasma samples from the first single-dose, safety and pharmacokinetic" study [Study No. 1] were determined by a LC/MS/MS method. The internal standards (mevastatin and mevastatin 6-hydroxyacid) were 52 added to each plasma sample (1 ml). Each sample was extracted on a SPEC-Plus CI8 disc, which was previously conditioned with methanol and water. The disc was then washed with water and formic acid. The analytes were eluted with 70:30 (v:v) methanol:water and 75:25 (v:v) acetonitrile:ethyl acetate. The eluate was then evaporated to dryness and reconstituted 5 in 50/ul of mobile phase (sodium acetate in acetonitrile/water). The sample was injected onto a SCEEX API Hi-Plus LC/MS/MS equipped with a short CI8 HPLC column. The peak area of the m/z 421.3-319.3 product ion of lovastatin acid was measured against the m/z 407.6-305.0 product ion of the internal standard (mevastatin 6-hydroxyacid) using negative ion MRM mode. The peak area of the m/z 427.4-325.0 product ion of lovastatin was 10 measured against the m/z 413,2-311.0 product ion of the internal standard (mevastatin) using positive ion MRM mode. Quantitation was performed using a weighted (1/concentration2) linear least squares regression line generated from plasma calibration standards. The standard lines for lovastatin and lovastatin acid were linear over the concentration range of 0.1-50 ng/ml. The interday precision and accuracy values were 3.7-24.3% relative standard 15 deviation and within 13%, respectively. Concentrations of lovastatin and lovastatin acid in plasma samples from Study Nos. 2-5 were determined by a LC/MS/MS method. The pH of each plasma sample was adjusted with ammonium formate buffer. Lovastatin, lovastatin acid and their corresponding internal 20 standards (d5-lovastatin and d5-lovastatin acid) were extracted using SPE cartridges and eluted with 75% methanol followed by acetonitrile. The extract was dried under nitrogen, reconstituted and injected onto a LC/MS/MS. The peak area of the m/z 423.2-303.2 product ion of lovastatin acid was measured against the m/z 428.2-303.2 product ion of the internal standard (d5-lovastatin acid) using MRM mode. The peak area of the m/z 405.2-285.2 25 product ion of lovastatin was measured against the m/z 410.2-285.2 product ion of the internal standard (d5-lovastatin) using MRM mode. Quantitation was performed using a weighted (1/concentration) linear least squares regression line generated from plasma calibration standards. The standard lines for lovastatin and lovastatin acid were linear over the concentration range of 0.1-20 ng/ml. The interday precision and accuracy values were 30 6.4-9.3% relative standard deviation and within 7%, respectively. 53 An enzymatic assay method was used to determine concentrations of active inhibitors (lovastatin acid + active metabolites of lovastatin) and total inhibitors (lovastatin + lovastatin acid + latent and active metabolites of lovastatin) of HMG-CoA reductase inhibitors in 5 plasma samples from the multiple-dose study [Study No. 4] , An aliquot of each sample was subjected to alkaline hydrolysis to determine the concentration of total inhibitors. Concentrations of active inhibitors were determined in unhydrolyzed samples. The inhibitory activity was measured against lovastatin acid as a standard. Lovastatin acid was used in its ammonium salt form and all results were expressed as nanogram equivalent per milliliter. 10 The standard curves for total and active inhibitors were over the concentration range of 0.5-100 ng eq/ml. The interday precision and accuracy values were 2.64-9.84% relative standard deviation and within 12.5%, respectively. Conclusions 15 1. The bioavailability of Lovastatin XL relative to MEVACOR, in terms of AUC0.24hr or AUCW8hr ratio of lovastatin, is greater than 100% after single-dose administration. The same is true at steady state. However, the relative bioavailability of Lovastatin XL to MEVACOR at steady state, in terms of AUC0.24hr ratio of lovastatin acid or 20 active or total inhibitors of HMG-CoA reductase, is close to or less than 100%. 2. Together with low C^ values, the relative bioavailability of Lovastatin XL indicates that the systemic exposure of patients to active drug and metabolites of lovastatin as well as total inhibitors of HMG-CoA reductase after administration of Lovastatin XL 25 is not higher than that after administration of MEVACOR. 3. Administration of Lovastatin XL following a high-fat breakfast decreases the bioavailability of lovastatin acid. 54 4. As the dose of Lovastatin XL increases from 10 to 40mg, the plasma profiles (including the AUC0.4ghr and Cm„ values) of lovastatin appear to increase linearly. 5. Accumulation of lovastatin and its latent and active metabolites after chronic once-5 daily administration of Lovastatin XL is approximately 1.4- to 2-fold. 6. When compared to MEVACOR, the increased benefit on lipid levels produced by Lovastatin XL is achieved with similar systemic exposure to active (and total) inhibitors of HMC-CoA reductase. No evidence of unfavorable safety and tolerability 10 characteristics is observed. The foregoing description of a preferred embodiment of the invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention precise form disclosed. In certain further preferred emodiments, the 15 controlled release oral lovastatin formulations of the invention may be characterized by other pharmacokinetic values which are set forth in the data provided in the appended examples, which data can be readily gleaned by one of ordinary skill in the art reviewing the appended Tables and Figures. Such pharmacokinetic values may be derived in part based on parameters such as Cmax (ng/mL); Cmin (ng/mL); Tmax (hr); fluctuation (%)(expressed as 20 the difference between Cmax and Cmin expressed as a percentage of Cmin); the area under the curve (AUC); and any combination thereof. Obvious modifications or variations are possible in light of the above 40 teachings. All such obvious modifications and variations are intended to be within the scope of the appended claims. 55 </div>

Claims

<div class="application article clearfix printTableText" id="claims"> What we claim is:

1. A controlled release oral solid dosage form comprising a therapeutically effective amount of lovastatin and a controlled release carrier, said dosage form increasing the bioavailability of lovastatin and not increasing the bioavailability of lovastatin acid, as compared to the same amount of lovastatin administered in an immediate release dosage form, the dosage form providing a reduction in serum cholesterol levels when administered to human patients on a once-a-day basis.

2. A controlled release oral solid dosage form comprising a therapeutically effective amount of lovastatin and a controlled release carrier, wherein the bioavailability of lovastatin and its latent and active metabolites at steady state conditions is about 1.4 to about 2 fold the bioavailability attained by the same amount of lovastatin administered once daily in an immediate release dosage form, the dosage form providing a reduction in serum cholesterol levels when administered to human patients on a once-a-day basis.

3. A controlled release oral solid dosage form comprising a therapeutically effective amount of lovastatin and a controlled release carrier, said dosage form providing an AUC0-24h of lovastatin of greater than 100% of the AUCo-24h provided by the same amount of lovastatin administered in an immediate release dosage form, and said dosage form providing an AUCo-24h of lovastatin acid of less than 100% provided by the same amount of lovastatin administered in an immediate release dosage form, the dosage form providing a reduction in serum cholesterol levels when administered to human patients on a once-a-day basis.

4. A controlled release oral solid dosage form comprising a therapeutically effective amount of lovastatin and a controlled release carrier, said dosage form after administration of a single dose providing a ratio of AUCo-24h of lovastatin to AUCo-24h lovastatin acid of from about 1:1 to about 3.6:1, the dosage form providing a reduction in serum cholesterol levels when administered to human patients on a once-a-day basis.

5. A controlled release oral solid dosage form comprising a therapeutically effective amount of lovastatin and a controlled release carrier, said dosage form after once daily administration for 28 days providing a ratio of AUCo.24h of lovastatin to AUCo-24h of lovastatin acid of from about 0.74:1 to about 2:1, the dosage form providing a reduction in serum cholesterol levels when administered to human patients on a once-a-day basis.

6. A controlled release oral solid dosage form comprising a therapeutically effective amount of lovastatin and a controlled release carrier, said dosage form after administration of a single dose providing a ratio of Cmax of lovastatin to Cmax of lovastatin acid of from about 1.1:1 to about 5:1.

7. A controlled release oral solid dosage form comprising a therapeutically effective amount of lovastatin and a controlled release carrier, said dosage form after once daily administration for 28 days providing a ratio of Cmax of lovastatin to Cmax of lovastatin acid of from about 0.75:1 to about 3:1. the dosage form providing a reduction in serum cholesterol levels when administered to human patients on a once-a-day basis.

8. The controlled release oral solid dosage form of claim 4, wherein the ratio is about 1.3:1.

9. The controlled release oral solid dosage form of claim 5, wherein the ratio is about 0.87:1.

10. The controlled release oral solid dosage form of claim 6, wherein the ratio is about 1.74:1.

11. The controlled release oral solid dosage form of claim 7, wherein the ratio is about 0.95:1.

12. The controlled release oral solid dosage form of claim 1, wherein the Tmax provided by the dosage form is from about 10 to about 32 hours. ANDRX CORPORATION by its Attorneys JAMES & WELLS u Intellectual Prc^~ Office of i\"z" ? k JAU </div>