What are therapeutic uses of prazosin, doxazosin, alfuzosin and tamulosin?

Treat elevated blood pressure Tamsulosin has the least effect on blood pressure because it is less selective for α1B receptors found in the blood vessels and more selective for α1A receptors in the prostate and bladder. Blockade of the α1A receptors decreases tone in the smooth muscle of the bladder neck and prostate and improves urine flow