what is doxazosin prescribed for
1 Doxazosin is used to treat benign prostatic hyperplasia (BPH) and high blood pressure. 2 Common side effects include dizziness, tiredness, and swelling of your feet, hands, arms, and legs. 3 Doxazosin can cause your blood pressure to become low, which may cause dizziness, lightheadedness, and vertigo when standing.