Patent ID: 9498447
Filing Date: 2016-11-22
CPC Classification: A61K

Claim Text:
1. A solid, oral pharmaceutical composition comprising: a single population of beads, said beads comprising: a core comprising methylphenidate or a pharmaceutical salt thereof; a sustained release layer enclosing the core, wherein the sustained release layer comprises a water-insoluble and water-permeable polymer, a water soluble polymer, a hydrophobic plasticizer, and a hydrophobic binder; and a delayed release layer enclosing the sustained release layer, wherein the delayed release layer comprises a pH dependent polymer or copolymer that is insoluble in aqueous medium at pH lower than 5.5; wherein the formulation provides an 8 hour lag time during which the formulation releases no more than 10% of the total methylphenidate or a pharmaceutical salt thereof followed by a sustained release period of 10-12 hours when the composition is placed in 700 ml aqueous solution of 0.1N HCl pH 1.1, for up to 2 hours followed by 4 hours in sodium phosphate buffer at pH 6.0; followed by 14 hours in sodium phosphate buffer, pH 7.2 at 37° C.±0.5° C., as measured by the USP Apparatus I.