Doxazosin Mesylate Extended-Release Tablets are a commonly prescribed medication for treating benign prostatic hyperplasia (BPH). As a selective alpha-blocker, its mechanism of action involves blocking alpha-adrenergic receptors on the smooth muscle of the bladder neck and prostate. This relaxes the smooth muscles in these areas, reduces urethral resistance, and thereby alleviates lower urinary tract symptoms such as difficulty urinating caused by BPH. Additionally, Doxazosin Extended-Release Tablets can block alpha receptors on vascular smooth muscle, leading to vasodilation, reduced peripheral vascular resistance, and consequently, lowered blood pressure. Therefore, Doxazosin Mesylate Extended-Release Tablets are typically used for treating both benign prostatic hyperplasia and hypertension. Specific usage and treatment should be guided by a physician's consultation. Common side effects of this medication include dizziness, headache, orthostatic hypotension, and rash.