Patent ID: 8580310

Claim:
An oral controlled release formulation comprising a plurality of multi-layer release beads, each bead comprising: (i) an immediate release core comprising a first portion of an effective dose of methylphenidate or a pharmaceutically acceptable salt thereof coated over an inert pharmaceutically acceptable bead; (ii) a controlled release layer coated over the core, the controlled release layer comprising a hydrophobic material in an amount sufficient to provide a controlled release of the first portion of the methylphenidate over a predetermined period of time, the hydrophobic material selected from the group consisting of an alkylcellulose, an acrylic polymer and mixtures thereof; (iii) a release delaying layer coated over the controlled release layer, the release delaying layer comprising a pH-dependent polymer in an amount sufficient to delay release of the first portion of the effective dose of methylphenidate or the pharmaceutically acceptable salt thereof until after the formulation passes through the stomach; and (iv) an outer layer coated over the release delaying layer, the outer layer comprising a second portion of the effective dose of methylphenidate or the pharmaceutically acceptable salt thereof; wherein the formulation provides: (a) a maximum plasma concentration of methylphenidate at about 0.5 to about 4 hours after an oral administration to a human patient, (b) a plasma concentration of methylphenidate which does not differ by more than 20% during a measuring interval, wherein the measuring interval is from about 2 hours to about 6 hours, (c) the plasma concentration of methylphenidate which is below effective plasma concentrations in said human patient at about 8 to 12 hours after the oral administration, and (d) an in-vitro dissolution as follows: Time % Methylphenidate (hours) Dissolved 0.25 0-45% 1 5-50% 4 40-90% 8 NLT 60% 12 NLT 80%.