Details for Patent: 9,370,525

Title:	Modified release preparations containing oxcarbazepine and derivatives thereof
Abstract:	Controlled-release preparations of oxcarbazepine and derivatives thereof for once-a-day administration are disclosed. The inventive compositions comprise solubility- and/or release enhancing agents to provide tailored drug release profiles, preferably sigmoidal release profiles. Methods of treatment comprising the inventive compositions are also disclosed.
Inventor(s):	Bhatt; Padmanabh P. (Rockville, MD), Kidane; Argaw (Montgomery Village, MD), Edwards; Kevin (Lovettsville, VA)
Assignee:	Supernus Pharmaceuticals, Inc. (Rockville, MD)
Filing Date:	Jul 23, 2015
Application Number:	14/807,165
Claims:	1. A pharmaceutical formulation for once-a-day administration comprising oxcarbazepine in a solid homogeneous matrix comprising at least one release promoting agent comprising a polymer having pH-dependent solubility selected from the group consisting of cellulose acetate phthalate, cellulose acetate succinate, methylcellulose phthalate, ethylhydroxycellulose phthalate, polyvinylacetate phthalate, polyvinylbutyrate acetate, vinyl acetate-maleic anhydride copolymer, styrene-maleic mono-ester copolymer, Eudagrit L100-55 (Methacrylic Acid--Ethyl Acrylate Copolymer (1:1)), and methyl acrylate-methacrylic acid copolymers. 2. The formulation of claim 1, further comprising at least one agent that enhances the solubility of oxcarbazepine selected from the group consisting of surface active agents, complexing agents, cyclodextrins, and pH modifying agents. 3. The formulation of claim 2, wherein the surface active agent is selected from the group consisting of sodium docusate, sodium lauryl sulfate, sodium stearyl fumarate, polyethylene oxide (PEO) modified sorbitan monoesters, fatty acid sorbitan esters, polyethylene oxide-polypropylene oxide-(poly(ethylene oxide)) block copolymers, or combinations thereof. 4. The formulation of claim 1, wherein the solid homogenous matrix comprises a matrix-forming polymer selected from the group consisting of cellulosic polymers, alginates, gums, cross-linked polyacrylic acid, carageenan, polyvinyl pyrrolidone, polyethylene oxides, and polyvinyl alcohol. 5. The formulation of claim 4, wherein the cellulosic polymers are selected from the group consisting of hydroxypropylmethylcellulose (HPMC), hydroxypropylcellulose (HPC), hydroxyethylcellulose (HEC), methylcellulose (MC), powdered cellulose, cellulose acetate, sodium carboxymethylcellulose, calcium salt of carboxymethylcellulose, and ethylcellulose. 6. The formulation of claim 1, wherein the matrix-forming polymer is present in the amount of from 1% to 50% by weight of the formulation. 7. The formulation of claim 1, wherein the polymer having pH dependent solubility remains intact at pH values of below 4 and dissolves at pH values of more than 4. 8. The formulation of claim 7, wherein the polymer having pH dependent solubility dissolves at pH values of more than 5. 9. The formulation of claim 8, wherein the polymer having pH dependent solubility dissolves at pH values of more than 6. 10. The formulation of claim 2, wherein the release promoting agent is incorporated in an amount from 10% to 90% by weight of the formulation, and the agent that enhances the solubility of oxcarbazepine is incorporated in an amount from 1% to 80% by weight of the formulation. 11. The formulation of claim 10, wherein the release promoting agent is incorporated in an amount from 30% to 70% by weight of the formulation, and the agent that enhances the solubility of oxcarbazepine is incorporated in an amount from 1% to 80% by weight of the formulation. 12. The formulation of claim 1, further comprising a lubricant selected from the group consisting of magnesium stearate, calcium stearate, zinc stearate, stearic acid, polyethylene glycol, leucine, glyceryl behenate, sodium stearyl fumarate, hydrogenated vegetable oils, and waxes. 13. The formulation of claim 12, wherein the wax is selected from the group consisting of beeswax, carnuba wax, cetyl alcohol, glyceryl stearate, glyceryl palmitate, and stearyl alcohol. 14. The formulation of claim 12, wherein the lubricant is incorporated in an amount of from 0.1% to 20% by weight of the formulation. 15. The formulation of claim 1, wherein the amount of oxcarbazepine is effective to produce a steady state blood level of monohydroxy derivative of oxcarbazepine in the range of about 2 .mu.g/ml to about 10 .mu.g/ml. 16. The formulation of claim 1, wherein the formulation is effective in minimizing fluctuations between C.sub.min and C.sub.max of monohydroxy derivative of oxcarbazepine. 17. The formulation of claim 16, which provides C.sub.max levels of monohydroxy derivative of oxcarbazepine in the range of about 6 .mu.g/ml to about 10 .mu.g/ml and C.sub.min levels of monohydroxy derivative of oxcarbazepine in the range of about 2 .mu.g/ml to about 5 .mu.g/ml. 18. The formulation of claim 1, wherein the amount of oxcarbazepine is 600 mg. 19. The formulation of claim 1, in the form of pellets, tablets, granules or capsules. 20. The formulation of claim 19 in the form of tablets. 21. The formulation of claim 20, wherein the tablets comprises 600 mg of oxcarbazepine.