SPL Set ID: 85ef422d-af27-4126-9841-6892af1871d6

Methylphenidate hydrochloride extended-release tablets, USP are a central nervous system (CNS) stimulant. Methylphenidate hydrochloride extended-release tablets, USP are available in four tablet strengths. Each extended-release tablet for once-a-day oral administration contains 18 mg, 27 mg, 36 mg, or 54 mg of methylphenidate hydrochloride, USP and is designed to have a 12-hour duration of effect. Chemically, methylphenidate hydrochloride, USP is d,l (racemic) methyl α-phenyl-2-piperidineacetate hydrochloride. Its molecular formula is C 14 H 19 NO 2 •HCl. Its structural formula is: Methylphenidate hydrochloride, USP is a white, odorless crystalline powder. Its solutions are acid to litmus. It is freely soluble in water and in methanol, soluble in alcohol, and slightly soluble in chloroform and in acetone. Its molecular weight is 269.77. Methylphenidate hydrochloride extended-release tablets, USP also contain the following inert ingredients: colloidal silicon dioxide, fumaric acid, hypromellose 2208, hypromellose 2910, lactose monohydrate, magnesium stearate, methacrylic acid copolymer Type A, methacrylic acid copolymer Type B, talc, titanium dioxide, and triethyl citrate. The 18 mg strength also contains iron oxide red, iron oxide yellow, polyethylene glycol 3350, and polyvinyl alcohol. The 27 mg strength also contains FD&C Blue #2/Indigo Carmine Aluminum Lake, iron oxide black, iron oxide yellow, polyethylene glycol 3350, and polyvinyl alcohol. The 36 mg strength also contains triacetin. The 54 mg strength also contains iron oxide red, polyethylene glycol 3350, and polyvinyl alcohol. The imprinting ink contains ammonium hydroxide, iron oxide black, propylene glycol, and shellac. Meets USP Dissolution Test 11. Structural Formula 11.1 System Components and Performance Methylphenidate hydrochloride extended-release tablets uses osmotic pressure to deliver methylphenidate HCl at a controlled rate. The system, which resembles a conventional tablet in appearance, comprises an osmotically active trilayer core surrounded by a semipermeable membrane with an immediate-release drug overcoat. The trilayer core is composed of two drug layers containing the drug and excipients, and a push layer containing osmotically active components. There is a precision-laser drilled orifice on the drug-layer end of the tablet. In an aqueous environment, such as the gastrointestinal tract, the drug overcoat dissolves within one hour, providing an initial dose of methylphenidate. Water permeates through the membrane into the tablet core. As the osmotically active polymer excipients expand, methylphenidate is released through the orifice. The membrane controls the rate at which water enters the tablet core, which in turn controls drug delivery. Furthermore, the drug release rate from the system increases with time over a period of 6 to 7 hours due to the drug-concentration gradient incorporated into the two drug layers of methylphenidate hydrochloride extended-release tablets. The biologically inert components of the tablet remain intact during gastrointestinal transit and are eliminated in the stool as a tablet shell along with insoluble core components. It is possible that Methylphenidate hydrochloride extended-release tablets may be visible on abdominal x-rays under certain circumstances, especially when digital enhancing techniques are utilized.