SPL Set ID: e4852fc2-b763-40e2-b8bb-a3f6da5c72fe

Prazosin hydrochloride USP, 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 white to tan powder, slightly soluble in water, in methanol, in dimethyl formamide, in dimethyl acetamide, very slightly soluble in alcohol, practically insoluble in isotonic saline, in chloroform and in acetone and has a molecular weight of 419.86. Each capsule, for oral administration, contains prazosin hydrochloride, USP equivalent (as the polyhydrate) to 1 mg, 2 mg or 5 mg of prazosin. Inert ingredients in the formulations are: colloidal silicon dioxide, lactose monohydrate, magnesium stearate, microcrystalline cellulose and sodium lauryl sulfate. The hard gelatin capsules contain gelatin and titanium dioxide. In addition, the 2 mg empty gelatin capsules contain FD&C Red No. 40, FD&C Red No. 3 and FD&C Blue No. 1; and the 5 mg empty gelatin capsules contain FD&C Red 3 and FD&C Blue No. 1. The imprinting ink also contains Black Iron Oxide, Potassium Hydroxide, Shellac. FDA approved dissolution test specifications differ from USP. Chemical Structure