Doxazosin is primarily used in the management of hypertension (high blood pressure) and benign prostatic hyperplasia (BPH). It functions as an alpha-1 adrenergic blocker, relaxing blood vessels and improving blood flow, which helps lower blood pressure. In BPH, it relaxes the muscles in the prostate and bladder neck, easing urinary symptoms such as difficulty in starting urination, weak stream, and frequent urination. It is often prescribed when other medications are ineffective or unsuitable. Regular monitoring is required to ensure optimal dosing and to manage potential side effects like dizziness or fatigue.