USRE40707E1 - Use of carbazole compounds for the treatment of congestive heart failure - Google Patents

Use of carbazole compounds for the treatment of congestive heart failure Download PDF

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USRE40707E1
USRE40707E1 US10/721,022 US72102203A USRE40707E US RE40707 E1 USRE40707 E1 US RE40707E1 US 72102203 A US72102203 A US 72102203A US RE40707 E USRE40707 E US RE40707E
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carvedilol
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Mary Ann Lukas-Laskey
Robert Ruffolo, Jr.
Neil Howard Shusterman
Gisbert Spooner
Klaus Strein
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SmithKline Beecham Cork Ltd
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/40—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with one nitrogen as the only ring hetero atom, e.g. sulpiride, succinimide, tolmetin, buflomedil
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/40—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with one nitrogen as the only ring hetero atom, e.g. sulpiride, succinimide, tolmetin, buflomedil
    • A61K31/403—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with one nitrogen as the only ring hetero atom, e.g. sulpiride, succinimide, tolmetin, buflomedil condensed with carbocyclic rings, e.g. carbazole
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/70—Carbohydrates; Sugars; Derivatives thereof
    • A61K31/7042—Compounds having saccharide radicals and heterocyclic rings
    • A61K31/7048—Compounds having saccharide radicals and heterocyclic rings having oxygen as a ring hetero atom, e.g. leucoglucosan, hesperidin, erythromycin, nystatin, digitoxin or digoxin
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P9/00—Drugs for disorders of the cardiovascular system
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P9/00—Drugs for disorders of the cardiovascular system
    • A61P9/04—Inotropic agents, i.e. stimulants of cardiac contraction; Drugs for heart failure

Definitions

  • the present invention relates to a new method of treatment using compounds which are dual non-selective ⁇ -adrenoceptor and ⁇ 1 -adrenoceptor antagonists in particular the carbazolyl-(4)-oxypropanolamine compounds of Formula I, preferably carvedilol, for decreasing the mortality of patients suffering from congestive heart failure (CHF).
  • compounds which are dual non-selective ⁇ -adrenoceptor and ⁇ 1 -adrenoceptor antagonists in particular the carbazolyl-(4)-oxypropanolamine compounds of Formula I, preferably carvedilol, for decreasing the mortality of patients suffering from congestive heart failure (CHF).
  • CHF congestive heart failure
  • the invention also relates to a method of treatment using compounds which are dual non-selective ⁇ -adrenoceptor and ⁇ 1 -adrenoceptor antagonists, in particular the carbazolyl-(4)-oxypropanolamine compounds of Formula I, preferably carvedilol, in conjunction with one or more other therapeutic agents, said agents being selected from the group consisting of angiotensin converting enzyme (ACE) inhibitors, diuretics, and cardiac glycosides, for decreasing the mortality of patients suffering from CHF.
  • ACE angiotensin converting enzyme
  • the invention further relates to an incremental application scheme for administering compounds which are ⁇ -adrenoreceptor and ⁇ 1 -adrenoreceptor antagonists.
  • Congestive heart failure occurs as a result of impaired pumping capability of the heart and is associated with abnormal retention of water and sodium.
  • treatment of chronic mild failure has included limitation of physical activity, restriction of salt intake, and the use of a diuretic. If these measures are not sufficient, a cardiac glycoside, which is an agent that increases the force of mycardial contraction, is typically added to the treatment regimen.
  • angiotensin converting enzyme inhibitors which are compounds that prevent the conversion of angiotensin I into the pressor-active angiotensin II, are prescribed for chronic treatment of congestive heart failure, in conjunction with a diuretic, a cardiac glycoside, or both.
  • congestive heart failure is a well-known cardiac disorder which results in an excess mortality. Applefeld, M. M., (1986) Am. J. Med. 80, Suppl. 2B, 73-77. Therefore, therapeutic agents that would decrease the mortality resulting from CHF in patients suffering therefrom are highly desirable.
  • the present invention provides a new use of compounds which are dual non-selective ⁇ -adrenoceptor and ⁇ 1 -adrenoceptor antagonists for the preparation of medicaments for the treatment of congestive heart failure.
  • the carbazolyl-(4)-oxypropanolamine compounds of Formula I are preferred, alone or in conjunction with one or more other therapeutic agents, said agents being selected from the group consisting of ACE inhibitors, diuretics, and cardiac glycosides, as therapeutics for decreasing mortality resulting from congestive heart failure in mammals.
  • the present invention preferably provides a method of treatment, alone or in conjunction with one or more other therapeutic agents, said agents being selected from the group consisting of ACE inhibitors, diuretics, and cardiac glycosides, for the compound of Formula I wherein R 1 is —H, R 2 is —H, R 3 is —H, R 4 is —H, X is 0, Ar is phenyl, R 5 is ortho —OCH 3 , and R 6 is —H, said compound being better known as carvedilol, which is (1-(carbazol-4-yloxy-3-[[2-(2-methoxyphenoxy) ethyl]amino]2-propanol), or a pharmaceutically acceptable salt thereof.
  • This patent further discloses a compound of Formula I, better known as carvedilol, which is (1-(carbazol-4-ylxoy-3-[[2-(2-methoxyphenoxy)ethyl]amino](2-propanol), having the structure shown in Formula II
  • Formula I compounds are novel multiple action drugs useful in the treatment of mild to moderate hypertension.
  • Carvedilol is known to be both a competitive non-selective ⁇ -adrenoceptor antagonist and a vasodilator, and is also a calcium channel antagonist at higher concentrations.
  • the vasodilatory actions of carvedilol result primarily from ⁇ 1 -adrenoceptor blockade, whereas the ⁇ -adrenoceptor blocking activity of the drug prevents reflex tachycardia when used in the treatment of hypertension.
  • These multiple actions of carvedilol are responsible for the antihypertensive efficacy of the drug in animals, particularly in humans. See Willette, R.
  • the antihypertensive action of carvedilol is mediated primarily by decreasing total pheripheral vascular resistance without causing the concomitant reflex changes in heart rate commonly associated with other antihypertensive agents.
  • Ruffolo, R. R., Jr. Gellai, M., Hieble, J. P. Willette, R. N. & Nichols, A. I. (1990) Eur. J. Clin. Pharmacol., 38, S82-S88.
  • Carvedilol also markedly reduces infarct size in rat, canine and porcine models of acute myocardial infarction, Ruffolo, R. R., Jr., et al., Drugs of Today, supra, possibly as a consequence of its antioxidant action in attenuating oxygen free radical-initiated lipid peroxidation, Yue, T. L., et al. supra.
  • the desirable therapeutic effect of the compounds of Formula I, particularly carvedilol may be augmented by using any one of said compounds: or any pharmaceutically acceptable salt of said compounds, in conjunction with ACE inhibitors, diuretics, and cardiac glycosides, which are effective therapeutic agents for the treatment of CHF.
  • the preferred ACE inhibitors of the present invention are selected from the group consisting of captopril, lisinopril, fosinopril and enalapril, or any pharmaceutically acceptable salts thereof and the preferred diuretics of the present invention are hydrochlorothiazide furosemide, or torasemide or any pharmaceutically acceptable salts thereof
  • the preferred cardiac glycosides of the present invention are digoxin, ⁇ -methyldigoxin or digitoxin.
  • the desirable therapeutic benefits of the compounds of Formula I, particularly carvedilol, are additive with those of such ACE inhibitors, or diuretics, or cardiac glycosides when administered in combination therewith.
  • Captopril is commercially available from E. R. Squibb & Sons. Inc.
  • Lisinopril, enalapril and hydrochlorothiazide are commercially available from Merck & Co. Furosemide is commercially available from Hoechst-Roussel Pharmaceuticals, Inc. Digoxin is commercially available from Burrough Wellcome Co. and Boehringer Mannheim GmbH, Digitoxin, ⁇ -Methyldigoxin, fosinopril and torasemide are commercially available from Boehringer Mannheim GmbH.
  • Compounds of Formula I may be conveniently prepared as described in U.S. Pat. No. 4,503,067.
  • Carvedilol is commercially available from SmithKline Beecham Corporation and Boehringer Mannheim GmbH (Germany).
  • compositions of the compounds of Formula I may be administered to patients according to the present invention in any medically acceptable manner, preferably orally.
  • the pharmaceutical composition will be in the form of a sterile injectable liquid stored in a suitable container such as an ampoule, or in the form of an aqueous or nonaqueous liquid suspension.
  • suitable container such as an ampoule
  • the nature and composition of the pharmaceutical carrier, diluent or excipient will, of course, depend on the intended route of administration, for example whether by intravenous or intramuscular injection.
  • compositions of the compounds of Formula I for use according to the present invention may be formulated as solutions of lyophilized powders for parental administration.
  • Powders may be reconstituted by addition of a suitable diluent or other pharmaceutically acceptable carrier prior to use.
  • the liquid formulation is generally a buffered, isotonic, aqueous solution.
  • suitable diluents are normal isotonic saline solution, standard 5% dextrose in water or buffered sodium or ammonium acetate solution.
  • Such formulation is especially suitable for parenteral administration, but may also be used for oral administration or contained in a metered dose inhaler or nebulizer for insufflation. It may be desirable to add excipients such as ethanol, polyvinylpyrrolidone, gelatin, hydroxy cellulose, acacia, polyethylene glycol, mannitol, sodium chloride or sodium citrate.
  • these compounds may be encapsulated, tableted or prepared in a emulsion or syrup for oral administration.
  • Pharmaceutically acceptable solid or liquid carriers may be added to enhance or stabilize the composition, or to facilitate preparation of the composition.
  • Liquid carriers include syrup, peanut oil, olive oil, glycerin, saline, ethanol, and water.
  • Solid carriers include starch, lactose, calcium sulfate dehydrate, terra alba, magnesium stearate or stearic acid, talc, pectin, acacia, agar or gelatin.
  • the carrier may also include a sustained release material such as glyceryl monostearate or glyceryl distearate, alone or with a wax.
  • the amount of solid carrier varies but, preferably, will be between about 20 mg to about 1 g per dosage unit.
  • the pharmaceutical preparations are made following the conventional techniques of pharmacy involving milling, mixing, granulating, and compressing, when necessary, for tablet forms: or milling, mixing and filling for hard gelatin capsule forms.
  • a liquid carrier When a liquid carrier is used, the preparation will be in the form of a syrup, elixir, emulsion or an aqueous or non-aqueous suspension.
  • Such a liquid formulation may be administered directly p.o. or filled into a soft gelatin capsule.
  • Compounds having the above-mentioned dual properties are preferably administered following a three-stage application scheme.
  • This scheme is characterized by the fact that incremental dosages of the active ingredient are administered to patients over a certain period of time, until the regular maintenance dosage is received. If this maintenance dosage is defined as the setting value being 100%, it was found that the application regimen in a first phase should extend for a period of 7-28 days, whereby only 10-30% of the setting dose are administered. Following this phase, a second application regimen should follow, wherein a dosage of 20-70% of the setting dose is administered to the patient for a period of 7-28 days. After termination of this phase, the third application period follows, wherein the daily complete setting dose (maintenance dose) is administered. The daily maintenance does can vary between 10-100 mg of said active ingredient.
  • dosing in humans for the treatment of disease according to the present invention should not exceed a dosage range of from about 3.125 to about 50 mg of the compounds of Formula I, particularly carvedilol, preferably given twice daily.
  • the patient should be started on a low dosage regimen of the described compound of Formula I, particularly carvedilol, and monitored for well-known symptoms of intolerance, e.g., fainting, to such compound. Once the patient is found to tolerate such compound, the patient should be brought slowly and incrementally up to the maintenance dose.
  • the preferred course of treatment is to start the patient on a dosage regimen with formulations which contain either 3.125 or 6.25 mg of active compound per single unit, preferably given twice daily, for 7-28 days.
  • the choice of initial dosage most appropriate for the particular patient is determined by the practitioner using well-known medical principles, including, but not limited to, body weight.
  • the dosage is doubled at the end of the two weeks and the patient is maintained at the new, higher dosage for an additional period, preferably to two more weeks, and observed for signs of intolerance.
  • This course is continued until the patient is brought to a maintenance dose.
  • the preferred maintenance dose is 25.0 mg of active compound per single unit, preferably given twice daily, for patients having a body weight of up to 85 kg.
  • the maintenance dose is between about 25.0 mg and about 50.0 mg, preferably given twice daily, preferably about 50.0 mg of active component per single unit, preferably given twice daily.
  • Dosing in humans for the treatment of disease according to the present invention includes the combination of compounds of Formula I with conventional agents.
  • the usual adult dosage of hydrochlorothiazide is 25-100 mg daily as a single dose or divided dose.
  • the recommended starting dose for enalapril is 2.5 mg administered once or twice daily.
  • the usual therapeutic dosing range for enalapril is 5-20 mg daily, given as a single dose or two divided doses.
  • the usual initial daily dosage of captopril is 25 mg three times per day (tid), with most patients having a satisfactory clinical improvement at 50 or 100 mg three times per day (tid).
  • compositions of this invention will vary according to the particular composition formulated, the mode of administration, the particular site of administration and the host being treated.
  • CHF heart failure
  • 1052 patients with CHF were prospectively enrolled into a multicenter trial program, in which the patients were randomly assigned (double-blind) to 6-12 months' treatment with placebo (PBO) or carvedilol (CRV).
  • PBO placebo
  • CRV carvedilol
  • Class II CHF patients with cardiac disease resulting in slight or moderate limitation of physical activity. They are comfortable at rest. Ordinary physical activity results in fatigue, palpitations, dyspnea, or anginal pain.
  • Class III CHF patients with cardiac disease resulting in marked limitations of physical activity. They are comfortable at rest. Less than ordinary physical activity results in fatigue, palpitations, dyspnea, or anginal pain.
  • Class IV CI patients with cardiac disease resulting in inability to carry on any physical activity without discomfort. Symptoms or cardiac insufficiency, or of the anginal syndrome. By “less than ordinary physical activity” is meant climbing, one flight of stairs, or walking two hundred yards.
  • ACE inhibitors and/or digoxin were stratified on the basis of baseline submatrixal exercise performance, into one of four trials:
  • Randomization was preceded by a screening and challenge period common to the four protocols.
  • the purpose of the screening period was to quality patients for study entry obtain reproducible baseline measurements, and stratify patients into the appropriate trial based on submaximal exercise testing.
  • Patients tolerating low-dose carvedilol were then randomized to blinded medication (carvedilol or placebo) with the dose titrated over several weeks in the range of 6.25 to 50 mg b.i.d. (or equivalent level of placebo).
  • the maintenance phase of each study ranged from six to 12 months, after which patients had the option of receiving open-label carvedilol in an extension study.
  • the overall mortality results for the program are shown in Table 2. All deaths that occurred during the intent-to-treat period are included. Treatment with carvedilol resulted in a 67% reduction in the risk of all-cause mortality. Analysis of mortality by certain baseline characteristics shows this to be a broad effect regardless of severity or etiology of CI. The effect was uniform in patients with mild heart failure or moderate to severe heart failure. Similarly, the mortality reduction was equivalent in patients with ischemic or non-ischemic heart failure.

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Abstract

A method of treatment using carvedilol is disclosed, wherein the carvedilol decreases the risk of mortality caused by congestive heart failure in patients. The patients are titrated with low amounts of carvedilol, with the initial titration dosage being only 10 to 30% of the daily maintenance dose.

Description

This application is a 371 of PCT/EP96/00498 filed Feb. 7, 1996.
FIELD OF THE INVENTION
The present invention relates to a new method of treatment using compounds which are dual non-selective β-adrenoceptor and α1-adrenoceptor antagonists in particular the carbazolyl-(4)-oxypropanolamine compounds of Formula I, preferably carvedilol, for decreasing the mortality of patients suffering from congestive heart failure (CHF). The invention also relates to a method of treatment using compounds which are dual non-selective β-adrenoceptor and α1-adrenoceptor antagonists, in particular the carbazolyl-(4)-oxypropanolamine compounds of Formula I, preferably carvedilol, in conjunction with one or more other therapeutic agents, said agents being selected from the group consisting of angiotensin converting enzyme (ACE) inhibitors, diuretics, and cardiac glycosides, for decreasing the mortality of patients suffering from CHF. The invention further relates to an incremental application scheme for administering compounds which are β-adrenoreceptor and α1-adrenoreceptor antagonists.
BACKGROUND OF THE INVENTION
Congestive heart failure occurs as a result of impaired pumping capability of the heart and is associated with abnormal retention of water and sodium. Traditionally, treatment of chronic mild failure has included limitation of physical activity, restriction of salt intake, and the use of a diuretic. If these measures are not sufficient, a cardiac glycoside, which is an agent that increases the force of mycardial contraction, is typically added to the treatment regimen.
Subsequently, angiotensin converting enzyme inhibitors, which are compounds that prevent the conversion of angiotensin I into the pressor-active angiotensin II, are prescribed for chronic treatment of congestive heart failure, in conjunction with a diuretic, a cardiac glycoside, or both.
Also, congestive heart failure is a well-known cardiac disorder which results in an excess mortality. Applefeld, M. M., (1986) Am. J. Med. 80, Suppl. 2B, 73-77. Therefore, therapeutic agents that would decrease the mortality resulting from CHF in patients suffering therefrom are highly desirable.
SUMMARY OF THE INVENTION
The present invention provides a new use of compounds which are dual non-selective β-adrenoceptor and α1-adrenoceptor antagonists for the preparation of medicaments for the treatment of congestive heart failure. In particular, the carbazolyl-(4)-oxypropanolamine compounds of Formula I are preferred, alone or in conjunction with one or more other therapeutic agents, said agents being selected from the group consisting of ACE inhibitors, diuretics, and cardiac glycosides, as therapeutics for decreasing mortality resulting from congestive heart failure in mammals. In particular, the present invention preferably provides a method of treatment, alone or in conjunction with one or more other therapeutic agents, said agents being selected from the group consisting of ACE inhibitors, diuretics, and cardiac glycosides, for the compound of Formula I wherein R1 is —H, R2 is —H, R3 is —H, R4 is —H, X is 0, Ar is phenyl, R5 is ortho —OCH3, and R6 is —H, said compound being better known as carvedilol, which is (1-(carbazol-4-yloxy-3-[[2-(2-methoxyphenoxy) ethyl]amino]2-propanol), or a pharmaceutically acceptable salt thereof.
DETAILED DESCRIPTION OF THE INVENTION
U.S. Pat. No. 4,503,067 discloses carbazolyl-(4)-oxypropanolamine compounds of Formula I:
TABLE 1
U.S. Carvedilol Heart Failure Trials-Baseline Characteristics
Placebo Carvedilol
Characteristic (n = 356) (n = 624)
Age, mean + SD (years) 59.9 + 11.7 58.8 − 11.8
Sex (% men) 62% 62%
Etiology (% inchemic) 43% 40%
Severity of CHF
Class II 41% 41%
Class III-IV 40% 39%
Unknown 19% 20%
LV ejection fraction, mean + SD 0.22 + 0.07 0.23 − 0.08
6 Minute walk (m + SD) 373 + 88  379 + 81 
Blood pressure (mmHg) 115/73 115/73
Heart rate (bpm + SD) 85 ± 13 86 ± 13

wherein
    • R1 is hydrogen, lower alkanoyl of up to 6 carbon atoms or aroyl selected from benzoyl, and naphthoyl;
    • R2 is hydrogen, lower alkyl of up to 6 carbon atoms or arylakyl selected from benzyl, phenylethyl and phenylpropyl;
    • R3 is hydrogen or lower alkyl of up to 6 carbon atoms,
    • R4 is hydrogen or lower alkyl of up to 6 carbon atoms, or when X is oxygen, R4 together with R5 can represent —CH2—O—;
    • X is a valency bond, —CH2, oxygen or sulfur;
    • Ar is selected from phenyl naphthyl, indanyl and tetrahydronaphthyl;
    • R5 and R6 are individually selected from hydrogen, fluorine, chlorine, bromine, hydroxyl, lower alkyl of up to 6 carbon atoms, a —CONH2— group, lower alkoxy of up to 6 carbon atoms, benzyloxy, lower alkylthio of up to 6 carbon atoms, lower alkysulphonyl of up to 6 carbon atoms and lower alkylsulphonyl of up to 6 carbon atoms; or
    • R5 and R6 together represent methylenedioxy; and pharmaceutically acceptable salts thereof.
This patent further discloses a compound of Formula I, better known as carvedilol, which is (1-(carbazol-4-ylxoy-3-[[2-(2-methoxyphenoxy)ethyl]amino](2-propanol), having the structure shown in Formula II
TABLE 2
Evaluation of Mortality in U.S. Carvedilol CHF Studies
Risk reduction
Carvedilol Placebo (95% Cl) p value*
All Cause Mortality 18/624 29/356 67% <0.001 
(2.9%) (8.2%) (42-81)
Class II CHF  7/361 12/202 68% 0.015
(1.9%) (5.9%) (20-97)
Class III-IV CHF 11/263 17/154 66% 0.004
(4.2%) (11.0%)  (30-84)
Ischemic Etiology 10/311 16/178 67% 0.003
(3.2%) (8.9%) (32-85)
Non-Ischemic  8/313 13/178 67% 0.014
Etiology (2.5%) (7.3%) (20-86)
*Cochran-Mantel-Haenael Antaysia
Formula I compounds, of which carvedilol is exemplary, are novel multiple action drugs useful in the treatment of mild to moderate hypertension. Carvedilol is known to be both a competitive non-selective β-adrenoceptor antagonist and a vasodilator, and is also a calcium channel antagonist at higher concentrations. The vasodilatory actions of carvedilol result primarily from α1-adrenoceptor blockade, whereas the β-adrenoceptor blocking activity of the drug prevents reflex tachycardia when used in the treatment of hypertension. These multiple actions of carvedilol are responsible for the antihypertensive efficacy of the drug in animals, particularly in humans. See Willette, R. N., Sauermelch, C. F. & Ruffolo, R. R., Jr. (1990) Eur. J. Pharmacol., 176, 237-240; Nichols, A. J., Gellai, M. & Ruffolo, R. R. Jr. (1991) Fundam. Clin. Pharmacol., 5, 25-38; Ruffolo, R. R. Ir., Gellai, M., Hieble, J. P., Willette, R. N. & Nichols, A. J. (1990) Eur. J. Clin. Pharmacol., 38, S82-588, Ruffolo, R. R., Ir., Boyle, D. A., Venuti, R. P, & Lukas, M. A. (1990) Drugs of Today, 27, 465-492; and Yue, T.-L., Cheng, H., Lysko, P. G., Mckenna, P. J., Feuerstein, R., Gu, I., Lysko, K. A., Davis, L. L. & Feuerstein, G. (1992) J. Pharmacol Exp. Ther., 263, 92-98.
The antihypertensive action of carvedilol is mediated primarily by decreasing total pheripheral vascular resistance without causing the concomitant reflex changes in heart rate commonly associated with other antihypertensive agents. Willette, R. N., et al. supra; Nichols, A. J., et al. supra. Ruffolo, R. R., Jr., Gellai, M., Hieble, J. P. Willette, R. N. & Nichols, A. I. (1990) Eur. J. Clin. Pharmacol., 38, S82-S88. Carvedilol also markedly reduces infarct size in rat, canine and porcine models of acute myocardial infarction, Ruffolo, R. R., Jr., et al., Drugs of Today, supra, possibly as a consequence of its antioxidant action in attenuating oxygen free radical-initiated lipid peroxidation, Yue, T. L., et al. supra.
Recently, it has been discovered in clinical studies that pharmaceutical compounds which are dual non-selective β-adrenoceptor and α1-adrenoceptor antagonists, in particular the compounds of Formula I, preferably carvedilol, alone or in conjunction with conventional agents, said agents being ACE inhibitors, diuretics, and cardiac glycosides, are effective therapeutic agents for treating CHF. The use of agents, such as carvedilol in treating CHF is surprising, since, in general, β-blockers are contraindicated in patients suffering from heart failure, because β-blockers are known to have undesirable cardiodepressive effects. The most surprising observation from the studies in which the instant compounds were used to treat CHF is that said compounds, in particular carvedilol, are able to decrease the mortality resulting from CHF in humans by about 67 percent. Furthermore, this result is present across all classifications of CHF and both etiologies (eschemic and non-eschemic). This result is surprising since two recent mortality studies using the β-blockers metoprolol (Waagstein, et al., (1993) Lancet, 342, 1441-1446) and bisoprolol (CIBIS investigators and committees, (1994) Circulation, 90, 1765-1773) in the treatment of CHF showed no difference in mortality between drug-treated patients and placebo-treated patients.
According to the method of treatment of the present invention, the desirable therapeutic effect of the compounds of Formula I, particularly carvedilol, may be augmented by using any one of said compounds: or any pharmaceutically acceptable salt of said compounds, in conjunction with ACE inhibitors, diuretics, and cardiac glycosides, which are effective therapeutic agents for the treatment of CHF. In particular, the preferred ACE inhibitors of the present invention are selected from the group consisting of captopril, lisinopril, fosinopril and enalapril, or any pharmaceutically acceptable salts thereof and the preferred diuretics of the present invention are hydrochlorothiazide furosemide, or torasemide or any pharmaceutically acceptable salts thereof The preferred cardiac glycosides of the present invention are digoxin, β-methyldigoxin or digitoxin. The desirable therapeutic benefits of the compounds of Formula I, particularly carvedilol, are additive with those of such ACE inhibitors, or diuretics, or cardiac glycosides when administered in combination therewith. Captopril is commercially available from E. R. Squibb & Sons. Inc. Lisinopril, enalapril and hydrochlorothiazide are commercially available from Merck & Co. Furosemide is commercially available from Hoechst-Roussel Pharmaceuticals, Inc. Digoxin is commercially available from Burrough Wellcome Co. and Boehringer Mannheim GmbH, Digitoxin, β-Methyldigoxin, fosinopril and torasemide are commercially available from Boehringer Mannheim GmbH.
Compounds of Formula I may be conveniently prepared as described in U.S. Pat. No. 4,503,067. Carvedilol is commercially available from SmithKline Beecham Corporation and Boehringer Mannheim GmbH (Germany).
Pharmaceutical compositions of the compounds of Formula I, including carvedilol, alone or in combination with ACE inhibitors, or diuretics, or cardiac glycosides may be administered to patients according to the present invention in any medically acceptable manner, preferably orally. For parental administration, the pharmaceutical composition will be in the form of a sterile injectable liquid stored in a suitable container such as an ampoule, or in the form of an aqueous or nonaqueous liquid suspension. The nature and composition of the pharmaceutical carrier, diluent or excipient will, of course, depend on the intended route of administration, for example whether by intravenous or intramuscular injection.
Pharmaceutical compositions of the compounds of Formula I for use according to the present invention may be formulated as solutions of lyophilized powders for parental administration. Powders may be reconstituted by addition of a suitable diluent or other pharmaceutically acceptable carrier prior to use. The liquid formulation is generally a buffered, isotonic, aqueous solution. Examples of suitable diluents are normal isotonic saline solution, standard 5% dextrose in water or buffered sodium or ammonium acetate solution. Such formulation is especially suitable for parenteral administration, but may also be used for oral administration or contained in a metered dose inhaler or nebulizer for insufflation. It may be desirable to add excipients such as ethanol, polyvinylpyrrolidone, gelatin, hydroxy cellulose, acacia, polyethylene glycol, mannitol, sodium chloride or sodium citrate.
Alternatively, these compounds may be encapsulated, tableted or prepared in a emulsion or syrup for oral administration. Pharmaceutically acceptable solid or liquid carriers may be added to enhance or stabilize the composition, or to facilitate preparation of the composition. Liquid carriers include syrup, peanut oil, olive oil, glycerin, saline, ethanol, and water. Solid carriers include starch, lactose, calcium sulfate dehydrate, terra alba, magnesium stearate or stearic acid, talc, pectin, acacia, agar or gelatin. The carrier may also include a sustained release material such as glyceryl monostearate or glyceryl distearate, alone or with a wax. The amount of solid carrier varies but, preferably, will be between about 20 mg to about 1 g per dosage unit. The pharmaceutical preparations are made following the conventional techniques of pharmacy involving milling, mixing, granulating, and compressing, when necessary, for tablet forms: or milling, mixing and filling for hard gelatin capsule forms. When a liquid carrier is used, the preparation will be in the form of a syrup, elixir, emulsion or an aqueous or non-aqueous suspension.
Such a liquid formulation may be administered directly p.o. or filled into a soft gelatin capsule.
Compounds having the above-mentioned dual properties are preferably administered following a three-stage application scheme. This scheme is characterized by the fact that incremental dosages of the active ingredient are administered to patients over a certain period of time, until the regular maintenance dosage is received. If this maintenance dosage is defined as the setting value being 100%, it was found that the application regimen in a first phase should extend for a period of 7-28 days, whereby only 10-30% of the setting dose are administered. Following this phase, a second application regimen should follow, wherein a dosage of 20-70% of the setting dose is administered to the patient for a period of 7-28 days. After termination of this phase, the third application period follows, wherein the daily complete setting dose (maintenance dose) is administered. The daily maintenance does can vary between 10-100 mg of said active ingredient.
In case of carvedilol, dosing in humans for the treatment of disease according to the present invention should not exceed a dosage range of from about 3.125 to about 50 mg of the compounds of Formula I, particularly carvedilol, preferably given twice daily. As one of the ordinary skill in the art will readily comprehend, the patient should be started on a low dosage regimen of the described compound of Formula I, particularly carvedilol, and monitored for well-known symptoms of intolerance, e.g., fainting, to such compound. Once the patient is found to tolerate such compound, the patient should be brought slowly and incrementally up to the maintenance dose. The preferred course of treatment is to start the patient on a dosage regimen with formulations which contain either 3.125 or 6.25 mg of active compound per single unit, preferably given twice daily, for 7-28 days. The choice of initial dosage most appropriate for the particular patient is determined by the practitioner using well-known medical principles, including, but not limited to, body weight. In the event that the patient exhibits medically acceptable tolerance of the compound for two weeks, the dosage is doubled at the end of the two weeks and the patient is maintained at the new, higher dosage for an additional period, preferably to two more weeks, and observed for signs of intolerance. This course is continued until the patient is brought to a maintenance dose. The preferred maintenance dose is 25.0 mg of active compound per single unit, preferably given twice daily, for patients having a body weight of up to 85 kg. For patients having a body weight of over 85 kg, the maintenance dose is between about 25.0 mg and about 50.0 mg, preferably given twice daily, preferably about 50.0 mg of active component per single unit, preferably given twice daily.
The present invention relates also to method of treatment for decreasing mortality resulting from congestive heart failure in mammals comprising internally administering to said mammal in need thereof an effective amount of carvedilol according to the following schedule:
    • (a) a pharmaceutical formulation which contains either 3.125 or 6.25 mg carvedilol per single unit for a period of 7-28 days, given once or twice daily.
    • (b) thereafter a pharmaceutical formulation which contains 12.5 mg carvedilol per single unit for a period of additional 7-28 days, given once or twice daily and
    • (c) finally a pharmaceutically formulation which contains either 25.0 or 50.0 mg carvedilol per single unit, given once or twice daily as a maintenance dose.
Dosing in humans for the treatment of disease according to the present invention includes the combination of compounds of Formula I with conventional agents. For example, the usual adult dosage of hydrochlorothiazide is 25-100 mg daily as a single dose or divided dose. The recommended starting dose for enalapril is 2.5 mg administered once or twice daily. The usual therapeutic dosing range for enalapril is 5-20 mg daily, given as a single dose or two divided doses. For most patients the usual initial daily dosage of captopril is 25 mg three times per day (tid), with most patients having a satisfactory clinical improvement at 50 or 100 mg three times per day (tid).
It will be appreciated that the actual preferred dosages of the compounds being used in the compositions of this invention will vary according to the particular composition formulated, the mode of administration, the particular site of administration and the host being treated.
No unacceptable toxicological effects are expected when the compounds of Formula I, including the compound of Formula II, are used according to the present invention. The example which follows is intended in no way to limit the scope of this invention, but is provided to illustrate how to use the compounds of this invention. Many other embodiments will be readily apparent to those skilled in the art.
EXPERIMENTAL
Mortality Studies in CHF Patients
Summary
To determine if β-adrenergic blockade might inhibit the deleterious effects of the sympathetic nervous system on survival in heart failure (CHF), 1052 patients with CHF were prospectively enrolled into a multicenter trial program, in which the patients were randomly assigned (double-blind) to 6-12 months' treatment with placebo (PBO) or carvedilol (CRV). After a common screening period, patients with class II-IV CHF (see next paragraph for the definitions of the classification of CI) and an ejection fraction <0.35 were assigned to one of four protocols based on performance on a 6-minute walk test. PBO or CRV was added to existing therapy with digoxin, diuretics and an ACE inhibitor. All-cause mortality was monitored by a prospectively constituted Data and Safety Monitoring Board (DSMB). After 25 months of enrollment, the DSMB recommended termination of the program because of a favorable effect of CRV on survival. By intention-to-eat, mortality was 8.2% in the PBO group but only 2.9% in the CRV group (P=0.0001. Cochran-Mantel-Haensel analysis). This represented a reduction in risk of death by CRV of 67% (95% CI: 42% to 81%). The treatment effect was similar in patients with class II and class III-IV symptoms. Mortality was reduced in class II patients from 5.9% to 1.9%, a 68% reduction (95% CI: 20% to 97%) [P=0.015,), and in class III-IV patients from 11.0% to 4.2%. a 67% reduction (95% CI 30% to 84%), [P=0.004, a log-rank]. Importantly, the effect of CRV was similar in ischematic heart disease (risk reduced by 67%. P=0.003) and in nonischemic dilated cardiomyopathy (risk reduced by 67%. P=0.014). In conclusion, the addition of CRV to conventional therapy is associated with a substantial (67%) reduction in the mortality of patients with chronic CHF. The treatment effect is seen across a broad range of severity and etiology of disease.
As used herein, by “Class II CHF” is meant patients with cardiac disease resulting in slight or moderate limitation of physical activity. They are comfortable at rest. Ordinary physical activity results in fatigue, palpitations, dyspnea, or anginal pain. By “Class III CHF” is meant patients with cardiac disease resulting in marked limitations of physical activity. They are comfortable at rest. Less than ordinary physical activity results in fatigue, palpitations, dyspnea, or anginal pain. By “Class IV CI” is meant patients with cardiac disease resulting in inability to carry on any physical activity without discomfort. Symptoms or cardiac insufficiency, or of the anginal syndrome. By “less than ordinary physical activity” is meant climbing, one flight of stairs, or walking two hundred yards.
Design of Study
Patients on background therapy with diuretics. ACE inhibitors and/or digoxin were stratified on the basis of baseline submatrixal exercise performance, into one of four trials:
    • study 220, a dose response study in moderate (NYHA II-IV) CHF with exercise testing as a primary endpoint
    • study 221, a dose titration study in moderate (NYHA II-IV) CI with exercise testing as a primary endpoint
    • study 239, a dose titration study in severe (NYHA III-IV) CHF with quality of life as a primary endpoint
    • study 240, a dose titration study in mild (NYHA II—III) CHF with progression of CHF as a primary endpoint
Sixty-four centers in the US participated in the trial program. All sites conducted protocols 239 and 240, while 33 performed protocol 220 and 31 performed protocol 221.
Although each trial had its own individual objectives, the overall program objective defined prospectively was evaluation of all-cause mortality. Based upon a projected enrollment of 1100 patients, the program had 90% power to detect a 50% reduction in mortality (two-sided) between carvedilol and placebo, assuming a mortality rate in the placebo group of 12% over the duration of the trials (α=0.05).
Randomization was preceded by a screening and challenge period common to the four protocols. The purpose of the screening period was to quality patients for study entry obtain reproducible baseline measurements, and stratify patients into the appropriate trial based on submaximal exercise testing. During the challenge period, patients received low-dose open-label carvedilol (6.25 mg b.i.d.) for two weeks. Patients unable to tolerate this dose did not proceed to randomization. Patients tolerating low-dose carvedilol were then randomized to blinded medication (carvedilol or placebo) with the dose titrated over several weeks in the range of 6.25 to 50 mg b.i.d. (or equivalent level of placebo). The maintenance phase of each study ranged from six to 12 months, after which patients had the option of receiving open-label carvedilol in an extension study.
Results
The analysis presented below corresponds to the data set on which the DSMB made the recommendation to terminate the trials. Included in this intent-to-eat analysis are all patients enrolled in the US trials as of Jan. 20, 1965; 624 receiving carvedilol and 356 placebo. An analysis of baseline patient characteristics (Table 1) shows good balance between the randomized groups.
Figure USRE040707-20090505-C00001
The overall mortality results for the program are shown in Table 2. All deaths that occurred during the intent-to-treat period are included. Treatment with carvedilol resulted in a 67% reduction in the risk of all-cause mortality. Analysis of mortality by certain baseline characteristics shows this to be a broad effect regardless of severity or etiology of CI. The effect was uniform in patients with mild heart failure or moderate to severe heart failure. Similarly, the mortality reduction was equivalent in patients with ischemic or non-ischemic heart failure.
Figure USRE040707-20090505-C00002
The foregoing is illustrative of the compounds of this invention. This invention, however, is not limited to the precise embodiment described herein, but encompasses all modification within the scope of the claims which follow.

Claims (16)

1. A method of decreasing a risk of mortality caused by congestive heart failure in a patient in need of such decrease, said method comprising:
administering to said patient first dosages at least daily for a period of from 7 to 28 days, said first dosages each comprising carvedilol,
then administering to said patient second dosages at least daily for a period of from 7 to 28 days, said second dosages each containing carvedilol, and
then administering to said patient third dosages daily for a maintenance period to decrease a risk of mortality caused by congestive heart failure, said third dosages each comprising carvedilol, said maintenance period is greater than six months, and said third dosages each comprising a daily maintenance dose in the range of from about 10 mg to about 100 mg of carvedilol,
said first dosages each comprising carvedilol in an amount which is 10-30% of said daily maintenance dose,
said second dosages each comprising carvedilol in an amount which is 20-70% of said daily maintenance dose.
2. The method of claim 1, wherein the daily maintenance dose is about 25 mg or about 50 mg.
3. The method of claim 1, further comprising administering to said patient at least one other therapeutic agent selected from the group consisting of angiotensin converting enzyme inhibitors, diuretics and cardiac glycosides.
4. The method of claim 3, wherein the angiotensin converting enzyme inhibitor is selected from the group consisting of captopril, lisinopril, fosinopril, enalapril and pharmaceutically acceptable salts of captopril, lisinopril, fosinopril and enalapril.
5. The method of claim 3, wherein said diuretic is selected from the group consisting of hydrochlorothiazide, torasemide, furosemide, and pharmaceutically acceptable salts of hydrochlorothiazide, torasemide and furosemide.
6. The method of claim 3, wherein said cardiac glycoside is selected from the group consisting of digoxin, β-methyl-digoxin and digitoxin.
7. A method of decreasing a risk of mortality caused by congestive heart failure in a patient, said method comprising administering to said patient first dosages once or twice daily, for a period of from 7 to 28 days, said first dosages each comprising carvedilol in an amount of about 3.125 mg or 6.25 mg,
then administering to said patient second dosages once or twice daily, for a period of from 7 to 28 days, said second dosages each comprising carvedilol in an amount of about 12.5 mg, and
then administering to said patient maintenance third dosages once or twice daily, said third dosages each comprising carvedilol in an amount of about 25.0 mg or about 50.0 mg.
8. A method as recited in claim 7, wherein at least one of said first, second and maintenance dosages further comprises at least one other therapeutic agent selected from the group consisting of an angiotensin converting enzyme inhibitor, a diuretic and a cardiac glycoside.
9. A method of treating to decrease a risk of mortality resulting from congestive heart failure in a patient in need of such treatment, said method comprising administering to said patient carvedilol, alone or in combination with at least one other therapeutic agent, in unit dosages once or twice daily, for a period of from 7 to 28 days, said unit dosages each comprising a pharmaceutical formulation comprising carvedilol in an amount of about 3.125 mg or about 6.25 mg.
10. A method of treating congestive heart failure in a patient in need of such treatment, said method comprising:
administering to said patient first dosages at least daily for a period of from 7 to 28 days, said first dosages each comprising carvedilol,
then administering to said patient second dosages at least daily for a period of from 7 to 28 days, said second dosages each comprising carvedilol, and
then administering to said patient third dosages daily for a maintenance period, said third dosages each comprising carvedilol, said third dosages each comprising a daily maintenance dose in the range of from about 10 mg to about 100 mg of carvedilol,
said first dosages each comprising carvedilol in an amount which his 10-30% of said daily maintenance dose,
said second dosages each comprising carvedilol in an amount which is 20-70% of said daily maintenance dose.
11. Method of claim 10, wherein carvedilol is administered to the patient once or twice daily.
12. A method according to claim 7, wherein said patient has class II-IV congestive heart failure.
13. A method according to claim 10, wherein said patient has class II-IV congestive heart failure.
14. A method of decreasing a risk of mortality caused by congestive heart failure in a patient, said method comprising administering to said patient first dosages once or twice daily, for a period of from 7 to 28 days, said first dosages each comprising carvedilol in an amount of about 3.125 mg,
then administering to said patient second dosages once or twice daily, for a period of from 7 to 28 days, said second dosages each comprising carvedilol in an amount of about 12.5 mg, and
then administering to said patient maintenance third dosages once or twice daily, said third dosages each comprising carvedilol in an amount of about 25.0 mg or about 50.0 mg.
15. A method according to claim 14, wherein said patient has class II-IV congestive heart failure.
16. A method as recited in claim 14, wherein at least one of said first, second and maintenance dosages further comprises at least one other therapeutic agent selected from the group consisting of an angiotensin converting enzyme inhibitor, a diuretic and a cardiac glycoside.
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US7750036B2 (en) 2003-11-25 2010-07-06 Sb Pharmco Puerto Rico Inc. Carvedilol salts, corresponding compositions, methods of delivery and/or treatment
US10772869B1 (en) 2019-07-24 2020-09-15 ECI Pharmaceuticals, LLC Pharmaceutical compositions including carvedilol and methods of using the same
US10959985B1 (en) 2019-07-24 2021-03-30 ECI Pharmaceuticals, LLC Pharmaceutical compositions including carvedilol and methods of using the same

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