SPL Set ID: bed99c2a-4266-4a2c-bb0f-7643fdafff78

Terazosin hydrochloride USP, an alpha-1-selective adrenoceptor blocking agent, is a quinazoline derivative represented by the following chemical name, molecular formula and structural formula: Piperazine, 1-(4-amino-6,7-dimethoxy-2-quinazolinyl)-4-[(tetrahydro-2-furanyl)carbonyl]-, monohydrochloride, dihydrate. C 19 H 25 N 5 O 4 HCl 2H 2 O. Terazosin hydrochloride, USP is a white to pale yellow, crystalline powder. Soluble in methanol, sparingly soluble in water, slightly soluble in alcohol and in 0.1 N hydrochloric acid, very slightly soluble in isotonic saline solution and in chloroform and practically insoluble in acetone and in hexanes and has a molecular weight of 459.93. Each capsule, for oral administration, contains the following inactive ingredients: colloidal silicon dioxide, lactose monohydrate, magnesium stearate, and pregelatinized starch. The gelatin capsule contains gelatin, sodium lauryl sulfate, and titanium dioxide. The 1 mg shell also contains ferric oxide black; the 2 mg capsule shell also contains D&C Yellow-10; the 5 mg capsule shell also contains D&C Yellow-10, D&C Red-28 and FD&C Red-40; the 10 mg capsule shell also contains D&C Yellow-10 and FD&C Green-3. Imprinting ink contains shellac, propylene glycol, butyl alcohol, potassium hydroxide and black iron oxide. FDA approved dissolution test specifications differ from USP. structure