What is terazosin?
Terazosin is in a group of drugs called alpha-adrenergic blockers. Terazosin causes the blood vessels (veins and arteries) to relax and expand, improving blood flow. Terazosin also relaxes muscles in the prostate and bladder neck, making it easier to urinate. Terazosin is used to treat hypertension (high blood pressure) and benign prostatic hyperplasia (enlarged prostate). Terazosin may also be used for purposes other than those listed in this medication guide.