SPL Set ID: 486d4f26-60ae-4e6c-aa36-0b298a7f9aed

Prazosin hydrochloride, USP a quinazoline derivative, is the first of a new chemical class of antihypertensives. The chemical name of prazosin hydrochloride, USP is 1-(4-amino-6,7-dimethoxy­2-quinazolinyl)-4-(2-furoyl) piperazine monohydrochloride and its structural formula is: Molecular formula C 19 H 21 N 5 O 4 • HCl It is a white to tan powder, slightly soluble in methanol, dimethylformamide, dimethyl acetamide, very slightly soluble in alcohol, practically insoluble in chloroform and in acetone and has a molecular weight of 419.86. Each 1 mg capsule of prazosin hydrochloride, USP for oral use contains drug equivalent to 1 mg free base. Each 2 mg capsule of prazosin hydrochloride, USP for oral use contains drug equivalent to 2 mg free base. Each 5 mg capsule of prazosin hydrochloride, USP for oral use contains drug equivalent to 5 mg free base. Prazosin hydrochloride capsules, USP contains the following inactive ingredients colloidal silicon dioxide, lactose monohydrate, maize starch, magnesium stearate, sodium lauryl sulfate and sodium starch glycolate. The empty gelatin capsule shells contain titanium dioxide and gelatin. In addition, the 2 mg and 5 mg empty gelatin capsule shells contain FD&C Red No. 3, and FD&C Blue No. 1. The imprinting ink contains black iron oxide, propylene glycol, potassium hydroxide and shellac. FDA approved dissolution test specification differs from the USP. prazosin-cap-structure