SPL Set ID: 7b269778-803b-4ce2-a8c0-636fb131d16a

Paliperidone extended-release tablets contains paliperidone USP, an atypical antipsychotic belonging to the chemical class of benzisoxazole derivatives. Paliperidone, USP contains 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 426.49. The structural formula is: Paliperidone, USP is sparingly soluble in 0.1N HCl and methylene chloride; practically insoluble in water, 0.1N NaOH, and hexane; and slightly soluble in N,N-dimethylformamide. Paliperidone extended-release tablets are intended for oral administration and are available in 1.5 mg (brown), 3 mg (white), 6 mg (light beige), and 9 mg (pink) strengths. Inactive ingredients are colloidal silicon dioxide, fumaric acid, hypromellose, lactose monohydrate, macrogol, magnesium stearate, methacrylic acid copolymer, microcrystalline cellulose, polyethylene oxides, povidone, talc and triethyl citrate. The 1.5 mg tablets also contain iron oxide black, iron oxide red and iron oxide yellow. The 6 mg tablets also contain iron oxide red and iron oxide yellow. The 9 mg tablets also contain iron oxide black, iron oxide red and iron oxide yellow. Delivery System Components and Performance Paliperidone extended-release tablets use a hydrophilic matrix core and pH dependent enteric coating to deliver paliperidone, USP at a controlled rate. The delivery system consists of an inner core composed of the drug, rate controlling polymers and other excipients. The core is coated with multiple layers comprising of delayed release polymer and a drug layering polymer system. Each tablet strength has a different colored coating. In an aqueous environment, such as the gastrointestinal tract, the water-dispersible overcoat erodes quickly. The combination of the coating layers ensures an initial drug release, while delaying exposure of the matrix core. Upon attaining the intended pH, the delayed release coating dissolves, the hydrophilic polymers of the core hydrate and swell forming a gel like barrier that regulates the rate at which the drug is released from the tablet, ensuring a steady and prolonged delivery. chem structure