Alpha blockers and vasodilating beta blockers--influence on factors involved in the pathogenesis of vascular disease in patients with hypertension.
Antihypertensive drugs that interact with adrenoceptors have certain advantages and disadvantages (on the treatment of hypertension). Alpha-1 antagonists such as prazosin have favorable effects on plasma lipids but may produce excessive postural falls in blood pressure, particularly following the initial dose. Recently developed alpha-1 antagonists (doxazosin, terazosin) have longer durations of action than prazosin, allowing less frequent administration. Beta blockers may be cardioprotective but in contrast to alpha-1 antagonists tend to have adverse effects on plasma lipids. Drugs with combined beta and alpha-1 blocking activity such as labetalol have favorable metabolic effects but postural hypotension remains a problem. Recently developed drugs with different alpha-1/beta blocking ratios that differ from labetalol may prove to be more popular clinically. Several beta blockers with vasodilator activity which is not due to alpha-1 blockade have also been developed. These drugs appear to have favorable metabolic effects similar to drugs with alpha-1 blocking activity, but do not cause postural hypotension.
Louis
W J
WJ
Department of Clinical Pharmacology & Therapeutics, Austin Hospital, Heidelberg, Vic, Australia.
Drummer
O H
OH
Howes
L G
LG
D000317:Adrenergic alpha-Antagonists / Q000627:therapeutic use; D000319:Adrenergic beta-Antagonists / Q000627:therapeutic use; D000959:Antihypertensive Agents / Q000009:adverse effects / Q000627:therapeutic use*; D006801:Humans; D006973:Hypertension / Q000097:blood / Q000150:complications / Q000188:drug therapy*; D008055:Lipids / Q000097:blood; D014652:Vascular Diseases / Q000209:etiology / Q000517:prevention & control*; D014665:Vasodilator Agents / Q000627:therapeutic use
D000317:Adrenergic alpha-Antagonists; D000319:Adrenergic beta-Antagonists; D000959:Antihypertensive Agents; D008055:Lipids; D014665:Vasodilator Agents