Doxazosin is used for:

Treating high blood pressure and treating signs and symptoms of benign prostatic hyperplasia (BPH).

Doxazosin is an alpha-blocker. It works by relaxing muscles in the blood vessels resulting in lowering of blood pressure. In BPH, alpha-blockers work by relaxing muscles around the urethra (the tube that drains urine from the bladder), which improves urinary symptoms...