ABSTRACT EXTENDED RELEASE OSMOTIC DOSAGE FORM COMPRISING HIGH METHYLPHENIDATE HYDROCHLORIDE LOAD The present invention provides an extended release osmotic tablet dosage form comprising methylphenidate hydrochloride (MPH). The dosage form comprises a core tablet comprising methylphenidate hydrochloride in an amount of more than 8% by weight of the core tablet a semipermeable membrane surrounding the core tablet, and an immediate release drug coat comprising methylphenidate hydrochloride surrounding the semipermeable membrane.