Pharmacological Studies on the Antihypertensive Effects of Cinnarizine Coadministered with Propranolol or Metoprolol(II) -Effects on the Isolated Smooth Muscle-

Cinnarizine을 Propranolol이나 Metoprolol과 병용할 때의 혈압(血壓) 강하(降下) 효과(效果)에 관한 약리학적(藥理學的) 연구(硏究)(II) -적출(摘出) 평활근(平滑筋)에 대한 효과-

In our former report we observed that cinnarizine influenced the antihypertensive effect of propranolol beneficially, but not of metoprolol in SHR and normal cat. Cardiac contractilities and smooth muscle relaxations induced by above drugs were measured to elucidate their mechanism of action. In cinnarizine and propranolol treated group, both of negative inotropic and ${\beta}-blocking$ activity of propranolol in perfused rat hearts were increased and propranolol induced contraction in isolated arterial and trachea smooth muscle of the guinea pig was antagonized comparing to propranolol alone treated group. However, in the cinnarizine and metoprolol treated group, no significant differences in activity on the above were observed compared to metoprolol alone treated group.