SPL Set ID: 71985eb4-07df-41c9-8b9a-85f39e92b7d0

Paliperidone extended-release tablets contain paliperidone, an atypical antipsychotic belonging to the chemical class of benzisoxazole derivatives. Paliperidone extended-release tablets contain a racemic mixture of (+)- and (-)- paliperidone. The chemical name is (±)-3-[2-[ 4-(6-fluoro-1 ,2-benzisoxazol-3-yl)-1-piperidinyl]ethyl]-6,7,8,9-tetrahydro-9-hydroxy-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one. Its molecular formula is C 23 H 27 FN 4 O 3 and its molecular weight is 426.48. The structural formula is: Paliperidone is sparingly soluble in 0.1 N HCl and in methylene chloride practically insoluble in water, in 0.1N NaOH, and in hexane and slightly soluble in N,N-dimethyl formamide and in tetrahydrofuran. Paliperidone extended-release tablets are intended for oral administration and are available in 1.5 mg (brown), 3 mg (white to off-white), 6 mg (yellow), and 9 mg (pink) strengths. Paliperidone extended-release tablets utilize OROS® osmotic drug-release technology. Inactive ingredients are polyethylene oxide, microcrystalline cellulose, povidone, butylated hydroxytoluene, colloidal silicone dioxide, magnesium stearate, sodium chloride, ferric oxide, hydroxypropyl cellulose, cellulose acetate, polyethylene glycol. Film coating contains hypromellose, titanium dioxide, and for 1.5 mg polyethylene glycol/macrogol MW 400, iron oxide yellow, iron oxide red. For 3 mg polyethylene glycol/macrogol MW 400. for 6 mg polyethylene glycol/macrogol 8000, talc, iron oxide yellow, black iron oxide. for 9 mg polyethylene glycol/macrogol MW 400, iron oxide yellow, iron oxide red. For imprinting, ink contains shellac glaze, propylene glycol and black iron oxide. Delivery System Components and Performance Paliperidone extended-release tablets use osmotic pressure to deliver paliperidone at a controlled rate. The delivery system, which resembles a round-shaped tablet in appearance, consists of an osmotically active bilayer core surrounded by a subcoat and semipermeable membrane. The bilayer core is composed of one drug layer containing the drug and excipients, and a push layer containing osmotically active components. There is one precision laser-drilled orifice on the drug-layer dome of the tablet. Each tablet strength has a different colored water-dispersible overcoat and print markings. In an aqueous environment, such as the gastrointestinal tract, the water-dispersible color overcoat erodes quickly. Water then enters the tablet through the semipermeable membrane that controls the rate at which water enters the tablet core, which, in turn, determines the rate of drug delivery. The hydrophilic polymers of the core hydrate and swell, creating a gel containing paliperidone that is then pushed out through the tablet orifices. 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. structure