**Question:** All are true regarding prazosin, EXCEPT:

A. Prazosin is a selective alpha-1 antagonist used for the management of hypertension.
B. Prazosin is a beta-blocker used for the treatment of angina pectoris.
C. Prazosin is a calcium channel blocker used for the management of arrhythmias.
D. Prazosin is a sedative used for insomnia.

**Core Concept:** Prazosin is a medication primarily used for the treatment of hypertension and nocturia (nighttime urinary urgency and frequency) due to benign prostatic hyperplasia (BPH). It is a selective alpha-1 antagonist, meaning it inhibits the action of alpha-1 adrenergic receptors, which are primarily found on smooth muscle cells in the prostate gland and bladder neck.

**Why the Correct Answer is Right:**

Option A is correct because prazosin is a selective alpha-1 antagonist, making it suitable for the treatment of hypertension, as it helps in reducing vascular resistance by relaxing the smooth muscle in the peripheral vessels.

Option B is incorrect because beta-blockers are used for the treatment of angina pectoris, a condition characterized by chest pain due to reduced blood flow to the heart. Prazosin does not have any effect on beta receptors, and thus is not used for angina management.

Option C is wrong because calcium channel blockers are medications that inhibit calcium influx into smooth muscle cells, leading to vasodilation and reduced blood pressure. Prazosin is not a calcium channel blocker; instead, it is a selective alpha-1 antagonist, as explained above.

Option D is incorrect because prazosin is not a sedative or used for insomnia. It is primarily used for managing hypertension and nocturia in BPH patients.

**Why Each Wrong Option is Invalid:**

Option A is incorrect because prazosin does not affect beta-receptors. Beta-blockers, like atenolol or metoprolol, are used for angina pectoris treatment, which is unrelated to hypertension or nocturia.

Option B is invalid because prazosin does not target beta receptors, which are involved in angina management. Beta-blockers, like propranolol or metoprolol, are primarily used for this purpose.

Option C is invalid because prazosin is not a calcium channel blocker. Calcium channel blockers, like nifedipine or verapamil, are primarily used for hypertension treatment, while prazosin is a selective alpha-1 antagonist for hypertension and nocturia management.

Option D is invalid because prazosin is not a sedative or used for insomnia. It is primarily used for hypertension management and treating nocturia in patients with BPH.

**Clinical Pearls:**

Prazosin is an effective medication for hypertension and nocturia in patients with BPH. It works by blocking alpha-1 receptors, which leads to vasodilation and reduced blood pressure. In the context of nocturia, prazosin helps in reducing the symptoms of nocturia by relaxing the smooth muscle in the bladder neck and pro