Doxazosin is sold under trade names such as Cardura and is a quinazoline compound. It is a selective alpha blocker used to treat high blood pressure and urinary retention related to benign prostatic hyperplasia in men. These characteristics allow this medicine to prevent strokes, heart attacks, and kidney problems. For prostate issues, it doesn’t shrink it but relaxes the prostate and bladder muscles; which in turn relieves urination difficulties. Doxazosin works primarily by relaxing the blood vessels so blood flow can be easier.