[Antihypertensive effect of betaxolol, a cardioselective beta-adrenoceptor antagonist, in renal hypertensive dogs].
The antihypertensive effect of betaxolol, a highly selective beta 1-adrenoceptor antagonist, was investigated in renal hypertensive dogs, and the mechanism was also studied. A single oral administration of betaxolol (1 and 10 mg/kg) lowered blood pressure dose-dependently. The hypotensive effect of betaxolol was enhanced by daily oral administration for 10 days. In anesthetized dogs, intraarterial injection of betaxolol produced a dose-dependent increase in femoral artery flow; and in this test, betaxolol was 3 times less potent than papaverine. The increase in blood flow with betaxolol was not affected by pretreatment with propranolol. These findings indicate that a certain vasodilating activity may contribute to the antihypertensive mechanism of betaxolol.
Bessho
H
H
Pharmaceuticals Laboratory, Mitsubishi Kasei Corporation, Yokohama, Japan.
Suzuki
J
J
Kitada
Y
Y
Narimatsu
A
A
Tobe
A
A
D000319:Adrenergic beta-Antagonists / Q000627:therapeutic use*; D000818:Animals; D001262:Atenolol / Q000627:therapeutic use; D015784:Betaxolol / Q000008:administration & dosage / Q000627:therapeutic use*; D001794:Blood Pressure; D004285:Dogs; D004305:Dose-Response Relationship, Drug; D005260:Female; D006339:Heart Rate; D006977:Hypertension, Renal / Q000188:drug therapy* / Q000503:physiopathology; D008297:Male; D011433:Propranolol / Q000627:therapeutic use
D000319:Adrenergic beta-Antagonists; D001262:Atenolol; D011433:Propranolol; D015784:Betaxolol