Claims for Patent: 8,252,332

Summary for Patent: 8,252,332

Title:	Gastric retained gabapentin dosage form
Abstract:	A method of treatment for epilepsy and other disease states is described, which comprises the delivery of gabapentin in a gastric retained dosage form.
Inventor(s):	Berner; Bret (El Granada, CA), Hou; Sui Yuen Eddie (Foster City, CA), Gusler; Gloria M. (Cupertino, CA)
Assignee:
Application Number:	12/749,101
Patent Claims:	1. A dosage form, comprising a matrix comprising gabapentin, wherein upon ingestion of the dosage form gabapentin is released from the matrix into the upper gastrointestinal tract over about 5-12 hours at a rate sufficient to achieve a lower maximum plasma concentration than that provided by an immediate release dosage form comprising an equal amount of gabapentin, and bioavailability of gabapentin is at least 80% of that provided by the immediate release dosage form comprising an equal amount of gabapentin as measured by the area under the plasma concentration-time curve, AUC.sub.inf. 2. The dosage form of claim 1, wherein the time to reach maximum plasma concentration is at least 5.6 hours.+-.34.9%. 3. The dosage form of claim 1, comprising a dose of gabapentin of between about 300-600 mg. 4. The dosage form of claim 1, wherein the matrix is a polymer matrix. 5. The dosage form of claim 4, wherein the polymer matrix is comprised of a swellable, hydrophilic polymer. 6. The dosage form of claim 5, wherein the gabapentin is released from the polymer matrix by diffusion. 7. A dosage form, comprising a matrix comprising 300 mg or 600 mg of gabapentin, wherein upon ingestion of one 600 mg dosage form or two 300 mg dosage forms gabapentin is released from the matrix into the upper gastrointestinal tract over about 5-12 hours at a rate sufficient to achieve a lower maximum plasma concentration than that provided by an immediate release dosage form comprising an equal amount of gabapentin, and bioavailability of gabapentin is at least 80% of that provided by the immediate release dosage form comprising an equal amount of gabapentin as measured by the area under the plasma concentration-time curve, AUC.sub.inf. 8. The dosage form of claim 7, wherein the time to reach maximum plasma concentration is at least 5.6 hours.+-.34.9%. 9. The dosage form of claim 7, wherein the matrix is a polymer matrix. 10. The dosage form of claim 9, wherein the polymer matrix is comprised of a swellable, hydrophilic polymer. 11. The dosage form of claim 10, wherein the gabapentin is released from the polymer matrix by diffusion. 12. A method of treating a condition responsive to a therapeutic dose of gabapentin, comprising: orally administering a dosage form, comprising a matrix comprising gabapentin, wherein upon ingestion of the dosage form gabapentin is released from the matrix into the upper gastrointestinal tract over about 5-12 hours at a rate sufficient to achieve a lower maximum plasma concentration than that provided by an immediate release dosage form comprising an equal amount of gabapentin, and bioavailability of gabapentin is at least 80% of that provided by the immediate release dosage form comprising an equal amount of gabapentin as measured by the area under the plasma concentration-time curve, AUC.sub.inf. 13. The method of claim 12, wherein the time to reach maximum plasma concentration is at least 5.6 hours.+-.34.9%. 14. The method of claim 12, wherein the matrix is a polymer matrix. 15. The method of claim 14, wherein the polymer matrix is comprised of a swellable, hydrophilic polymer. 16. The method of claim 12, wherein the condition is pain. 17. The method of claim 12, wherein the condition is neuropathic pain. 18. The dosage form of claim 1, wherein the gabapentin is released from the matrix at a rate sufficient to achieve a maximum plasma concentration of at least about 3 .mu.g/mL. 19. The dosage form of claim 1, wherein the ratio of the maximum plasma concentration to the plasma concentration at 15 hours after administration is no more than about 2. 20. The dosage form of claim 7, wherein the gabapentin is released from the matrix at a rate sufficient to achieve a maximum plasma concentration of at least about 3 .mu.g/mL. 21. The method of claim 12, wherein the gabapentin is released from the matrix at a rate sufficient to achieve a maximum plasma concentration of at least about 3 .mu.g/mL. 22. A dosage form, comprising a matrix comprising gabapentin, wherein upon ingestion of the dosage form gabapentin is released from the matrix into the upper gastrointestinal tract over about 5-12 hours at a rate sufficient to achieve a longer time to the maximum plasma concentration than that provided by an immediate release dosage form comprising an equal amount of gabapentin, and bioavailability of gabapentin is at least 80% of that provided by the immediate release dosage form comprising an equal amount of gabapentin as measured by the area under the plasma concentration-time curve, AUC.sub.inf. 23. A dosage form, comprising: a matrix comprising 300 mg or 600 mg of gabapentin, wherein upon ingestion of one 600 mg dosage form or two 300 mg dosage forms gabapentin is released from the matrix into the upper gastrointestinal tract over about 5-12 hours at a rate sufficient to achieve a longer time to the maximum plasma concentration than that provided by an immediate release dosage form comprising an equal amount of gabapentin, and bioavailability of gabapentin is at least 80% of that provided by the immediate release dosage form comprising an equal amount of gabapentin as measured by the area under the plasma concentration-time curve, AUC.sub.inf. 24. A method of treating a condition responsive to a therapeutic dose of gabapentin, comprising orally administering a dosage form comprising a matrix comprising gabapentin, wherein gabapentin is released from the matrix into the upper gastrointestinal tract over about 5-12 hours at a rate sufficient to achieve a longer time to the maximum plasma concentration than that provided by an immediate release dosage form comprising an equal amount of gabapentin, and bioavailability of gabapentin is at least 80% of that provided by the immediate release dosage form comprising an equal amount of gabapentin as measured by the area under the plasma concentration-time curve, AUC.sub.inf.