SPL Set ID: b3d6d2a8-97c4-5bad-e053-2a95a90a155d

Oxybutynin chloride extended-release tablet, USP is an antispasmodic, muscarinic antagonist. Each oxybutynin chloride extended-release tablet, USP contains 5 mg, 10 mg, or 15 mg of oxybutynin chloride USP, formulated as a once-a-day controlled-release tablet for oral administration. Oxybutynin chloride is administered as a racemate of R- and S-enantiomers. Chemically, oxybutynin chloride is d,l (racemic) 4-diethylamino-2-butynyl phenylcyclohexylglycolate hydrochloride. The empirical formula of oxybutynin chloride is C 22H 31NO 3•HCl. Its structural formula is: [Chemical Structure] Oxybutynin chloride is a white crystalline solid with a molecular weight of 393.9. It is readily soluble in water and acids, but relatively insoluble in alkalis. Oxybutynin chloride extended-release tablets, USP contains the following inert ingredients: colloidal anhydrous silicon dioxide, hypromellose, lactose monohydrate, magnesium stearate, methacrylic acid copolymer type-c, microcrystalline cellulose, polyethylene glycol, sodium bicarbonate, sodium lauryl sulfate, talc, titanium dioxide, triethyl citrate. Coloring agents are ferric oxide yellow (in all strengths), ferric oxide red (in 5 mg and 10 mg only) and ferric oxide black (in 15 mg only). System Components and Performance Oxybutynin chloride extended-release tablets, USP are formulated to deliver oxybutynin chloride at a controlled rate over approximately 24 hours. The dosage form is comprised of a hydrophilic cellulose polymer matrix tablet surrounded by an enteric coating system. The enteric coat is insoluble in the low pH environment of the stomach. As the tablet passes through the stomach and enters the higher pH environment of the small intestine, the enteric coating dissolves and/or erodes to expose the polymer matrix tablet which swells and releases drug at a controlled rate via diffusion and/or erosion. Oxybutynin chloride extended-release tablets, USP meets USP dissolution test 5.