Alpha adrenergic antagonist

In pharmacology, alpha adrenergic blockers are "drugs that bind to but do not activate alpha-adrenergic receptors thereby blocking the actions of endogenous or exogenous adrenergic agonists. Adrenergic alpha-antagonists are used in the treatment of hypertension, vasospasm, peripheral vascular disease, shock, and pheochromocytoma."

Costs
According to drugstore.com:
 * Alfuzosin (Uroxatral) 10 mg - $121.85 for 30 tablets
 * Tamsulosin (Flomax) 0.4 - $142.19 for 30 tablets
 * Prazosin (Minipress) 5 mg - $33.99 for 60 tablets