SPL Set ID: 2aa62e0a-442d-41af-a2d8-0b8f88d23319

Prazosin hydrochloride, a quinazoline derivative, is the first of a new chemical class of antihypertensives. It is the hydrochloride salt of 1-(4-amino-6, 7-dimethoxy-2-quinazolinyl)-4-(2-furoyl) piperazine and its structural formula is: Molecular formula C 19 H 21 N 5 O 4 .HCl It is a white or almost white crystalline powder, very slightly soluble in water, slightly soluble in alcohol and methanol, practically insoluble in acetone and has a molecular weight of 419.87. Each 1 mg capsule of prazosin hydrochloride USP, for oral use contains drug equivalent to 1 mg free base. Prazosin hydrochloride capsules USP contains the following inactive ingredients: corn starch, magnesium stearate, sodium lauryl sulfate, sucrose. The hard gelatin capsules contain gelatin and titanium dioxide. In addition, the 1 mg hard gelatin capsules contain D&C Yellow 10 and FD&C Yellow 6; the 2 mg hard gelatin capsules contain D&C Yellow 10, FD&C Blue 1, FD&C Red 3 and FD&C Yellow 6; the 5 mg hard gelatin capsules contains D&C Yellow 10, FD&C Blue 1, FD&C Red 3 and FD&C Yellow 6. The capsule shells are imprinted with black ink which contains black iron oxide, potassium hydroxide and shellac. FDA approved dissolution test specifications differ from USP. Chemical Structure