WO2003035040A1 - Methods of treatment using a gastric retained gabapentin dosage - Google Patents

Methods of treatment using a gastric retained gabapentin dosage Download PDF

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Publication number
WO2003035040A1
WO2003035040A1 PCT/IB2002/005440 IB0205440W WO03035040A1 WO 2003035040 A1 WO2003035040 A1 WO 2003035040A1 IB 0205440 W IB0205440 W IB 0205440W WO 03035040 A1 WO03035040 A1 WO 03035040A1
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Prior art keywords
dosage form
gabapentin
daily
administered
dosage
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PCT/IB2002/005440
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English (en)
French (fr)
Inventor
Bret Berner
Sui Yuen Eddie Hou
Gloria M. Gusler
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Assertio Holdings Inc
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Depomed Inc
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Application filed by Depomed Inc filed Critical Depomed Inc
Priority to JP2003537607A priority Critical patent/JP5421511B2/ja
Priority to EP02781665.1A priority patent/EP1439825B2/en
Priority to AU2002348828A priority patent/AU2002348828B2/en
Priority to MXPA04003946A priority patent/MXPA04003946A/es
Priority to DK02781665.1T priority patent/DK1439825T4/en
Priority to CA2464322A priority patent/CA2464322C/en
Publication of WO2003035040A1 publication Critical patent/WO2003035040A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/0012—Galenical forms characterised by the site of application
    • A61K9/0053—Mouth and digestive tract, i.e. intraoral and peroral administration
    • A61K9/0065—Forms with gastric retention, e.g. floating on gastric juice, adhering to gastric mucosa, expanding to prevent passage through the pylorus
    • 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
    • A61K31/185—Acids; Anhydrides, halides or salts thereof, e.g. sulfur acids, imidic, hydrazonic or hydroximic acids
    • A61K31/19—Carboxylic acids, e.g. valproic acid
    • A61K31/195—Carboxylic acids, e.g. valproic acid having an amino group
    • 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
    • A61K31/185—Acids; Anhydrides, halides or salts thereof, e.g. sulfur acids, imidic, hydrazonic or hydroximic acids
    • A61K31/19—Carboxylic acids, e.g. valproic acid
    • A61K31/195—Carboxylic acids, e.g. valproic acid having an amino group
    • A61K31/197—Carboxylic acids, e.g. valproic acid having an amino group the amino and the carboxyl groups being attached to the same acyclic carbon chain, e.g. gamma-aminobutyric acid [GABA], beta-alanine, epsilon-aminocaproic acid or pantothenic acid
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K45/00—Medicinal preparations containing active ingredients not provided for in groups A61K31/00 - A61K41/00
    • A61K45/06—Mixtures of active ingredients without chemical characterisation, e.g. antiphlogistics and cardiaca
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/0002—Galenical forms characterised by the drug release technique; Application systems commanded by energy
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P25/00—Drugs for disorders of the nervous system
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P25/00—Drugs for disorders of the nervous system
    • A61P25/02—Drugs for disorders of the nervous system for peripheral neuropathies
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P25/00—Drugs for disorders of the nervous system
    • A61P25/04—Centrally acting analgesics, e.g. opioids
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P25/00—Drugs for disorders of the nervous system
    • A61P25/06—Antimigraine agents
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P25/00—Drugs for disorders of the nervous system
    • A61P25/08—Antiepileptics; Anticonvulsants
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P25/00—Drugs for disorders of the nervous system
    • A61P25/14—Drugs for disorders of the nervous system for treating abnormal movements, e.g. chorea, dyskinesia
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P25/00—Drugs for disorders of the nervous system
    • A61P25/18—Antipsychotics, i.e. neuroleptics; Drugs for mania or schizophrenia
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P25/00—Drugs for disorders of the nervous system
    • A61P25/24—Antidepressants
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P29/00—Non-central analgesic, antipyretic or antiinflammatory agents, e.g. antirheumatic agents; Non-steroidal antiinflammatory drugs [NSAID]
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/20—Pills, tablets, discs, rods
    • A61K9/2004—Excipients; Inactive ingredients
    • A61K9/2022—Organic macromolecular compounds
    • A61K9/2031—Organic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polyethylene glycol, polyethylene oxide, poloxamers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/20—Pills, tablets, discs, rods
    • A61K9/2004—Excipients; Inactive ingredients
    • A61K9/2022—Organic macromolecular compounds
    • A61K9/205—Polysaccharides, e.g. alginate, gums; Cyclodextrin
    • A61K9/2054—Cellulose; Cellulose derivatives, e.g. hydroxypropyl methylcellulose
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/48—Preparations in capsules, e.g. of gelatin, of chocolate

Definitions

  • the present invention relates to the use of gabapentin in a gastric retained dosage form. More specifically, the invention relates to the use of such dosage form to treat epilepsy and other disease states.
  • Gabapentin (l-(aminomethyl)cyclohexaneacetic acid) is an anti-epileptic drug that is currently available in 100 mg, 300 mg and 400 mg hard shell capsule as well as 600 mg and 800 mg tablet dosage forms, with recommended dosing of 900 mg to 1800 mg total daily dose in three divided dosages.
  • the oral bioavailability is dose-dependent, with is approximately 60% bioavailability for a dose in the range of 300-400 mg, but with only
  • a controlled release dosage form would lower the maximum plasma concentration, and this may result in reduced side effects.
  • gabapentin is absorbed high in the gastrointestinal tract, by means of a saturable transport mechanism, a gastric retained dosage form is particularly beneficial for delivery of gabapentin since the dosage form would be able to keep the drug in the region of absorption and show improved bioavailability by virtue of the slower release rate that avoids saturation of the carrier mediated transport of conventional dosages.
  • One aspect of the invention relates to a method of treating epilepsy comprising administering a therapeutically effective amount of gabapentin or a pharmaceutically acceptable salt thereof, in a gastric retained dosage form to a mammal in need of such treatment.
  • the invention relates to a method of treating a disease state, such as epilepsy, by administering gabapentin in a once- or twice-daily gastric retained dosage form.
  • the gastric retained dosage form is particularly beneficial for delivery of gabapentin due to its prolonged transit in the upper gastrointestinal tract, which allows the drug to be absorbed adequately in the preferred region of absorption.
  • a gastric retained dosage form increases the t max and allows for a smoother, more prolonged anti-spasmolytic effect.
  • This dosage form also lowers the C m a and may result in reduced incidence and/or severity of CNS side effects of the drug, such as somnolence, ataxia, fatigue and dizziness.
  • the instant invention is a method of treating a disease state comprising administering a therapeutically effective amount of gabapentin, or a pharmaceutically acceptable salt thereof, once- or twice-daily in a gastric retained dosage form to a mammal in need of such treatment.
  • treating covers treating the specified disease in a mammal, particularly a human, and includes:
  • One embodiment of the invention relates to an improved method of administering a therapeutically effective amount of gabapentin to a patient in need thereof, the improvement comprising administering gabapentin or a pharmaceutically acceptable salt thereof, in a gastric retained dosage form.
  • inventions relate to methods of treating specific disease states comprising administering a therapeutically effective amount of gabapentin or a pharmaceutically acceptable salt thereof, in a gastric retained dosage form to a mammal in need of such treatment.
  • Such methods find utility in treating numerous disease states that are currently being treated with conventional immediate release formulations of gabapentin and include, by way of illustration and not limitation, epilepsy; neuropathic pain; psychiatric disorders such as bipolar disorder and panic disorder; movement disorders such as restless leg syndrome, periodic movement disorder of sleep, essential tremor and acquired nystagmus; and prophylaxis of migraine headaches.
  • the invention also contemplates administering one or more additional therapeutic agents with the gabapentin treatment.
  • additional therapeutic agents will depend upon the specific disease state being treated, and are described in detail below.
  • the active ingredient in the method of the invention is gabapentin.
  • Gabapentin is preferably used in the free amphoteric form.
  • Pharmaceutically acceptable salt forms that retain the biological effectiveness and properties of gabapentin and are not biologically or otherwise undesirable can also be used and may show superior bioavailability.
  • the term "gabapentin” is intended to include the agent itself, as well as its pharmaceutically acceptable salts.
  • Pharmaceutically acceptable salts may be amphoteric and may be present in the form of internal salts. Gabapentin may form acid addition salts and salts with bases.
  • Exemplary acids that can be used to form such salts include, by way of example and not limitation, mineral acids such as hydrochloric, hydrobromic, sulfuric or phosphoric acid or organic acids such as organic sulfonic acids and organic carboxylic acids.
  • Salts formed with inorganic bases include, for example, the sodium, potassium, lithium, ammonium, calcium, and magnesium salts.
  • Salts derived from organic bases include, for example, the salts of primary, secondary and tertiary amines, substituted amines including naturally- occurring substituted amines, and cyclic amines, including isopropylamine, trimethylamine, diethylamine, triethylamine, tripropylamine, ethanolamine, 2-dimethyl aminoethanol, tromethamine, lysine, arginine, histidine, caffeine, procaine, hydrabamine, choline, betaine, ethylenediamine, glucosamine, N-alkylglucamines, theobromine, purines, piperazine, piperidine, N-ethylpiperidine, fumarate, maleate, succinate, acetate and oxalate.
  • isopropylamine trimethylamine, diethylamine, triethylamine, tripropylamine, ethanolamine, 2-dimethyl aminoethanol, tromethamine, lysine,
  • the methods of the invention also contemplate the addition of one or more therapeutic agents with the gabapentin treatment.
  • additional therapeutic agents can be other anti-epileptics or anticonvulsants, which include, by way of illustration and not limitation, hydantoins, iminostilbenes, valproates, phenyltriazines, barbiturates, deoxybarbiturates, benzodiazepines and carbamates.
  • additional agents are preferably hydantoins, iminostilbenes, valproates or phenyltriazines.
  • hydantoin anticonvulsants include ethotoin, fosphenytoin, mephenytoin, and, preferably, phenytoin.
  • An examples of a suitable iminostilbene is carbamazepine.
  • suitable valproates include valprioic acid and sodium valproate.
  • An exemplary suitable phenyltriazine is lamotrigene.
  • a suitable barbiturate is phenobarbital and an exemplary deoxybarbiturate is primidone.
  • An example of a suitable benzodiazepine is clorazepate.
  • a suitable carbamate is felbamate.
  • such additional therapeutic agents can be selected from the group consisting of other anticonvulsants, tricyclic antidepressants, levadopa, and opioids.
  • Suitable anticonvulsants include carbamazepine, phenytoin and lamotrigine.
  • Suitable tricyclic antidepressants include amitriptyline, imipramine, clomipramine and desipramine.
  • suitable opioids include oxycodone and tramadol.
  • such additional therapeutic agents can be selected from the group consisting of lithium, carbamazepine, valproate, trifluoperazine, clonazepam, risperidone, lorazepam, venlafaxine, clozapine, olanzapine, benzodiazepines, neuroleptics, tricyclic antidepressants, selective en reuptake inhibitor (SSRI's), buprupion, and nefadone.
  • SSRI's selective en reuptake inhibitor
  • buprupion and nefadone.
  • such additional therapeutic agents can be selected from the group consisting of lithium, carbamazepine, valproate, trifluoperazine, clonazepam, risperidone, lorazepam, venlafaxine, clozapine, olanzapine, benzodiazepines, and neuroleptics.
  • such additional therapeutic agents can be selected from the group consisting of tri-cyclic anti-depressants, SSRI's, bupropion, venlaxatine, and nefadone.
  • such additional therapeutic agents can be selected from the group consisting of diazepam, and oxazepam.
  • such additional therapeutic agents can be selected from the group consisting of benzodiazepines, dopaminergic agents, and opiates, particularly levodopa/carbidopa and clonazepam.
  • additional therapeutic agents can be selected from the group consisting of tricyclic antidepressants (amitriptyline, doxepin, imipramine, maprotiline, protriptyline, desipramine), SSRI (fluoxetine), triptine (sumatriptan, etc.), and ergotamine.
  • terapéuticaally effective amount refers to that amount which is sufficient to effect treatment, when administered to a mammal in need of such treatment.
  • the therapeutically effective amount will vary depending on the subject being treated, the severity of the disease state and the manner of administration, and may be determined routinely by one of ordinary skill in the art.
  • gabapentin may be used at doses appropriate for treating epilepsy or neuropathic pain with immediate release dosage forms.
  • the gastric retained dosage form is designed to provide for bioavailability of gabapentin at a level greater than or equal to 80% (>80%) relative to an equal dose of an immediate release dosage form.
  • the method of the invention will involve administering gabapentin on a once- or twice-daily basis for as long as the condition persists.
  • An effective dosage of gabapentin for the treatment of epilepsy is typically in the range of about 300-3600 mg/day, typically about 900-2400 mg/day, more typically about
  • An effective dosage of gabapentin for the treatment of neuropathic pain is typically in the range of about 100-4800 mg/day, typically about 300-3600 mg/day, more typically about 900-2400 mg/day.
  • An effective dosage of gabapentin for the treatment of psychiatric disorders is typically in the range of about 100-4800 mg/day, more typically about 900-3600 mg/day.
  • An effective dosage of gabapentin for the treatment of movement disorders is typically in the range of about 100-4000 mg/day, typically about 200-2700 mg day, more typically about 500-2700 mg/day.
  • An effective dosage of gabapentin for the prophylactic treatment of migraine headaches is typically in the range of about 200-4000 mg/day, typically about 500-3600 mg/day, more typically about 900-2400 mg/day.
  • the methods of the invention provide a once- or twice-daily dose of the gabapentin gastric retained dosage form.
  • the dosage can be administered at any time, but it is preferred that the dosage is administered at the same approximate time each day and in approximately 12 hour intervals for the duration of treatment.
  • the gastric retained dosage form be taken with food, for example with the morning or evening meals.
  • gabapentin is administered once- daily, for example, in the morning (e.g., upon rising or with the morning meal) or in the evening (e.g., with the evening meal or near bedtime).
  • gabapentin is administered twice-daily, for example, with the first dose being in the morning (e.g., upon rising or with the morning meal) and the second dose being in the evening (e.g., with the evening meal or near bedtime),
  • the method of administering a therapeutically effective amount of gabapentin in a gastric retained dosage form further includes administering one or more additional therapeutic agents.
  • the additional therapeutic agents can be administered at the same time or at a different time than the administration of gabapentin, and will depend upon the nature of the disease being treated as well as the agent itself. For example, when the additional agent is another anti-epileptic, a twice-daily dose is sufficient and it may be administered at the same time or at a different time than gabapentin. For purposes of facilitating patient compliance, administration of any of the aforementioned additional agents at the same time is preferred.
  • gastric retained dosage forms that contain hydrophilic polymers that swell to a size such that the dosage form is retained in the fed mode.
  • the gastric retained dosage form can contain polymers with a high swelling capacity such as polyethylene oxide, hydroxyethylcellulose and hydroxypropylmethylcellulose.
  • the polymers are preferably of a moderate to high molecular weight (4xl0 3 to greater that 10 7 ) to enhance swelling and provide control of the release of gabapentin.
  • a hydroxypropylmethylcellulose polymer of such molecular weight is utilized so that the viscosity of a 1% aqueous solution is about 4000 cps to greater than 100,000 cps.
  • suitable polyethylene oxide polymers are those having molecular weights (viscosity average) on the order of 2-7 million.
  • a typical dosage form should swell to approximately 115% of its original volume within one hour after administration, and at a later time should swell to a volume that is 130% or more of the original volume.
  • Fillers, binders, lubricants and other additives may also be included in the gastric retained dosage form, such as are well known to those of skill in the art.
  • a typical dosage form would provide for a drug delivery profile such that gabapentin both on an in vivo and in vitro basis, is delivered for at least 5 hours, and typically over a time period of about 8-10 hours.
  • the gastric retained dosage form of gabapentin is a capsule dosage form that allows for the extended release of gabapentin in the stomach and comprises: (a) at least one component that expands on contact with gastric juice and contains an agent capable of releasing carbon dioxide or nitrogen, gabapentin or a pharmaceutically acceptable salt thereof; (b) at least one hydrophilic membrane in the form of a sachet which contains component (a), expands by inflation, floats on the aqueous phase in the stomach and is permeable to gastric juice and; (c) capsule dosage form which contains components (a) and (b) and which disintegrates without delay in the stomach under the action of gastric juice.
  • Component (a) may also contain a pharmaceutically acceptable hydrophilic swelling agent such as lower alkyl ethers of cellulose, starches, water-soluble aliphatic or cyclic poly-N-vinylamides, polyvinyl alcohols, polyacrylates, polymethacrylates, polyethylene glycols and mixtures thereof, as well as other materials used in the manufacture of pharmaceutical dosage forms. Further details regarding an example of this type of dosage form can be found in Sinnreich, US Patent No. 4,996,058.
  • the gastric retained dosage form of gabapentin is an extended release oral drug dosage form for releasing gabapentin into the stomach, duodenum and small intestine of a patient, and comprises: a single or a plurality of solid particles consisting of gabapentin or a pharmaceutically acceptable salt thereof dispersed within a polymer that (i) swells unrestrained dimensionally by imbibing water from gastric fluid to increase the size of the particles to promote gastric retention in the stomach of the patient in which the fed mode has been induced; (ii) gradually the gabapentin diffuses or the polymer erodes over a time period of hours, where the diffusion or erosion commences upon contact with the gastric fluid; and (iii) releases gabapentin to the stomach, duodenum and small intestine of the patient, as a result of the diffusion or polymeric erosion at a rate corresponding to the time period.
  • Exemplary polymers include polyethylene oxides, alkyl substituted cellulose materials and combinations thereof, for example, high molecular weight polyethylene oxides and high molecular weight or viscosity hydroxypropylmethylcellulose materials. Further details regarding an example of this type of dosage form can be found in Shell, et al, US Patent No. 5,972,389 and Shell, et al., WO 9855107.
  • a bi-layer tablet releases gabapentin to the upper gastrointestinal tract from an active containing layer, while the other layer is a swelling or floating layer. Details of this dosage may be found in Franz, et al., US Patent No. 5,232,704. This dosage form may be surrounded by a band of insoluble material as described by Wong, et al, US Patent No. 6,120,803.
  • Another embodiment of the invention uses a gastric retained swellable, sustained- release tablet having a matrix comprised of poly(ethylene oxide) and hydroxypropylmethylcellulose.
  • This dosage form is illustrated in Example 1 and further details may be found in Gusler, et al., "Optimal Polymer Mixtures For Gastric Retentive Tablets," filed on like date herewith and identified as Attorney Docket No. 15662- 001700US, the disclosure of which is incorporated herein by reference.
  • these agents can either be administered in the gastric retained dosage form that includes gabapentin or can be administered in a dosage form that is separate from gabapentin.
  • Exemplary dosage forms are described below.
  • dosages can be any suitable formulation as are well known in the art.
  • the agent may be incorporated in the gabapentin gastric retained dosage form or be administered in a separate gastric retained or other controlled release formulation dosage form.
  • the agent may be incorporated in a coating around the gabapentin gastric retained dosage form or in a separate layer of a bilayer tablet, the agent may be simply enclosed in the capsule of the aforementioned gabapentin gastric retained capsule dosage form, or the agent may be administered in a separate immediate release dosage form.
  • dosage forms contain the additional agent (another anti-epileptic or anticonvulsant agent) in combination with one or more pharmaceutically acceptable ingredients.
  • the carrier may be in the form of a solid, semi-solid or liquid diluent, or a capsule.
  • amount of active agent is about 0J-95wt%, more typically about 1- 50wt%.
  • Actual methods of preparing such dosage forms are known, or will be apparent, to those skilled in this art; for example, see Remington's Pharmaceutical Sciences, Mack
  • the dosage form to be administered will, in any event, contain a quantity of the additional therapeutic agent(s) in an amount effective to alleviate the symptoms of the subject being treated.
  • the agent may be mixed with solid, powdered ingredients, such as lactose, microcrystalline cellulose, maltodextrin, saccharose, sorbitol, mannitol, starch, amylopectin, cellulose derivatives, gelatin, or another suitable ingredient, as well as with disintegrating agents and lubricating agents such as magnesium stearate, calcium stearate, sodium stearyl fumarate and polyethylene glycol waxes.
  • disintegrating agents and lubricating agents such as magnesium stearate, calcium stearate, sodium stearyl fumarate and polyethylene glycol waxes.
  • Soft gelatin capsules may be prepared by mixing the active agent and vegetable oil, fat, or other suitable vehicle.
  • Hard gelatin capsules may contain granules of the active agent, alone or in combination with solid powdered ingredients such as lactose, saccharose, sorbitol, mannitol, potato starch, corn starch, amylopectin, cellulose derivatives or gelatin.
  • Liquid preparations for oral administration may be prepared in the form of syrups or suspensions, e.g. solutions or suspensions containing about 0.2-20wt% of the active agent and the remainder consisting of sugar or sugar alcohols and a mixture of ethanol, water, glycerol, propylene glycol and polyethylene glycol. If desired, such liquid preparations may contain coloring agents, flavoring agents, saccharin and carboxymethyl cellulose or other thickening agents.
  • Liquid preparations for oral administration may also be prepared in the form of a dry powder to be reconstituted with a suitable solvent prior to use.
  • the method of the invention includes administering another anti-epileptic or an anticonvulsant agent
  • dosage forms that can be administered.
  • other formulations can be readily designed based upon knowledge in the art, and include the gastric-retained delivery systems described above.
  • Typical dosage forms of the other anti-epileptics or anticonvulsants suitable for use in the invention include tablets, capsules, oral suspensions and syrup.
  • One of skill in the art can readily prepare one of these exemplary formulations or the other anti-epileptic can be administered by means of one of the numerous commercially available products, examples of which are provided below.
  • Commercially available hydantoin anticonvulsants include, for example, Peganone®
  • Typical dosage forms of the antineuralgics suitable for use in the invention include tablets, capsules and oral suspensions.
  • One of skill in the art can readily prepare one of these exemplary formulations or the antineuralgic can be administered by means of one of the numerous commercially available products , examples of which are provided below.
  • Commercially available antineuralgics include, for example, Atretol® (carbamazepine, Elan).
  • Tablets were manufactured using a dry blend process, and hand made on a Carver 'Auto C Press (Fred Carver, Inc., Indiana).
  • the dry blend process consisted of blending all of the ingredients in a plastic bag, and compressing into a 1000 mg tablet (600 mg gabapentin dose) using a 0J086" x 0.3937" Mod Oval die (Natoli Engineering).
  • the parameters for the operation of the Carver 'Auto C Press were as follows: 4000 lbs. force, 0 second dwell time (the setting on the Carver Press), and 100% pump speed.
  • Tablets were manufactured using a dry blend process, and hand made on a Carver 'Auto C Press (Fred Carver, Inc., Indiana).
  • the dry blend process consisted of blending all of the ingredients in a plastic bag, and compressing into a 600 mg tablet (300 mg gabapentin) using a 0.6299" x 0.3937" Mod Oval die (Natoli Engineering).
  • the parameters for the operation of the Carver 'Auto C Press were as follows: -2000-2500 lbs. force, 0 second dwell time (the setting on the Carver Press), and 100% pump speed.
  • Active gabapentin
  • PEO Coagulant poly(ethylene oxide), grade PolyOx Coagulant, NF FP grade, manufactured by Union Carbide/Dow Chemical Company
  • Methocel K15M hydroxypropylmethylcellulose, grade Methocel K15M, premium, manufacture by Dow Chemical Company
  • M.St. magnesium stearate, NF supplied by Spectrum Chemical Company
  • the dissolution was determined in USP apparatus I (40 mesh baskets), 100 rpm, in deionized water. Samples, 5 ml at each time-point, were taken without media replacement at 1, 2, 4 and 8 hours.
  • GR Gastric Retentive
  • Gabapentin was obtained from Plantex U.S.A. (Englewood Cliffs, NJ). Methocel brand hydroxypropyl methylcellulose (also known as hypromellose), and Sentry ® PolyOx ® brand polyethylene oxide were obtained from Dow Chemical (Midland, Michigan). Methocel E5, premium is a USP type 2910 hydroxypropyl methylcellulose with number average molecular weight of on the order of 6000-8000 and a viscosity of 5 cps as a 2% aqueous solution at 20 ° C.
  • Methocel ® K4M and Methocel ® K15M are USP type 2208 hydroxypropyl methylcellulose with viscosities of 4000 cps and 15,000 cps, respectively, as a 2% aqueous solution at 20 ° C, and number average molecular weights on the order of 80,000 and 100,000, respectively.
  • Sentry ® PolyOx ® WSR 301, NF FP, Sentry ® PolyOx ® WSR Coagulant, NF FP and Sentry ® PolyOx ® WSR 303, NF FP have viscosity-average molecular weights of approximately 4,000,000, 5,000,000 and 7,000,000, respectively.
  • Avicel PH-101, NF is microcrystalline cellulose supplied by FMC Corporation (Philadelphia, PA). Magnesium stearate, NF was supplied by Spectrum Quality Products (New Brunswick, NJ).
  • Example 4 The pharmacokinetic profiles of the three formulations described in Example 3, administered as a 600-mg dose, were compared to Neurontin ® immediate release 300-mg capsule in a randomized four-way cross-over experiment involving 15 healthy volunteers. Each subject was administered treatment of 600-mg gabapentin as one of the three GRTM formulations (1 X 600-mg tablet or 2 X 300-mg tablet) or Neurontin ® capsules (2 X 300- mg) within 5 minutes of completing a high fat breakfast (FDA breakfast). Plasma samples were taken up to 48 hours post-dose.
  • Figure 2 below illustrates the average plasma profile for the four treatments administered, and the pharmacokinetic data are summarized in tabulated form below.
  • Figure 2 illustrates the average plasma profile for the four treatments administered, and the pharmacokinetic data are summarized in tabulated form below. Figure 2

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