alpha-blockers

Definition of alpha-blocker
National Cancer Institute

alpha-blocker

(AL-fuh-BLAH-ker)
A substance that relaxes muscle tissue in blood vessels and in the prostate gland, which improves the flow of urine and blood. Alpha-blockers are used to treat the symptoms of many conditions, such as benign prostatic hyperplasia (BPH), high blood pressure, and some blood circulation problems. Also called alpha-adrenergic antagonist.

Source: NCI Dictionary of Cancer Terms