SPL Set ID: 130c84dc-b598-660f-e063-6294a90a8e46

Terazosin hydrochloride, USP an alpha-1-selective adrenoceptor blocking agent, is a quinazoline derivative represented by the following chemical name and structural formula: (RS)-Piperazine,1-(4-amino-6,7-dimethoxy-2-quinazolinyl)-4-[(tetra-hydro-2-furanyl)carbonyl]-, monohydrochloride, dihydrate. Terazosin hydrochloride, USP is a white to pale yellow crystalline powder, slightly soluble in water pH 1.3 (HCl), water pH 12.6 (NaOH), ethanol 95% and chloroform, sparingly soluble in water pH 6, soluble in methanol, and practically insoluble in n-hexane. Its molecular formula is C 19 H 25 N 5 O 4 •HCl•2H 2 O and has a molecular weight of 459.93 g/mole. Each capsule, for oral administration, contains terazosin hydrochloride, USP equivalent to 1 mg, 2 mg, 5 mg, or 10 mg of terazosin. In addition, each capsule contains the following inactive ingredients: Colloidal silicon dioxide, lactose monohydrate, magnesium stearate, and pregelatinized starch. The capsule shell contains D&C yellow no. 10 (2 mg, 5 mg and 10 mg), D&C red no. 28 (5 mg), FD& C green no. 3 (10 mg), FD&C red no. 40 (5 mg), gelatin, iron oxide black (1 mg), sodium lauryl sulfate, and titanium dioxide. The capsules are printed with black ink composed of ammonia solution, black iron oxide, potassium hydroxide, propylene glycol, and shellac. FDA approved dissolution test specifications differ from USP. image description