Terazosin hydrochloride is a prescription medication classified as an alpha-1 adrenergic receptor antagonist. It is used therapeutically to manage high blood pressure and to relieve symptoms of benign prostatic hyperplasia. The drug works by blocking alpha-1 receptors on vascular smooth muscle and prostate tissue. This receptor blockade reduces sympathetic nervous system signaling resulting in vasodilation and decreased peripheral resistance. In the prostate the inhibition of alpha-1 receptors relaxes smooth muscle leading to improved urine flow. The overall pharmacological effect is a lowering of arterial pressure and an alleviation of lower urinary tract symptoms.

Terazosin hydrochloride is a medication classified as an alpha blocker used to treat hypertension and benign prostatic hyperplasia. It works by blocking alpha-adrenergic receptors on blood vessel walls and in the prostate. This blockade prevents the action of norepinephrine causing smooth muscle relaxation. In the vasculature the relaxation reduces peripheral resistance and lowers blood pressure. In the prostate the relaxation improves urine flow and eases symptoms of hyperplasia. The drug is absorbed orally and reaches peak plasma concentrations within a few hours after ingestion. It has a long elimination half life allowing once daily dosing to maintain steady receptor blockade. The overall pharmacological effect is reduced vascular tone and inhibition of smooth muscle contraction mediated by sympathetic nerves.

Terazosin hydrochloride is a medication used to treat high blood pressure and symptoms of an enlarged prostate. Some people may experience dizziness or lightheadedness, particularly after the first dose or when standing up quickly. Headache and fatigue are also reported in a number of patients during treatment. Skin reactions such as rash or itching can occur, though they are usually mild. In rare cases, more serious effects like fainting, rapid heartbeat, or swelling of the ankles may appear. Changes in sexual function including decreased libido or difficulty achieving an erection have been noted. Some individuals notice swelling in the face or lips, which can be a sign of an allergic response. Patients should monitor how they feel and report persistent or severe symptoms to their healthcare provider.

Terazosin hydrochloride may cause dizziness or lightheadedness, especially when standing up quickly. It can also lead to drowsiness or fatigue in some individuals. Headache and nasal congestion are reported side effects of the medication. Some people experience swelling of the ankles or feet due to fluid retention. Rarely, it may affect sexual function, such as decreased libido or difficulty achieving orgasm. Nighttime urination may increase as a result of the medication's effect on blood pressure regulation.