Terazosin Hydrochloride and its Impurities

A quinazoline derivative which is an alpha-1-selective adrenoceptor blocking agent used on once-a-day basis for therapy of mild-to-moderate hypertension. Terazosin is indicated for the treatment of symptomatic benign prostatic hyperplasia (BPH). Reference standards of Terazosin Hydrochloride API, and its pharmacopeial, non pharmacopeial impurities, and stable isotopes are listed below.