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 other purposes not listed in this medication guide.