incidence of side effects are dose-dependent , as is the efficacy of the beta-agonist in uterine relaxation . the effect of verapamil ( ca2+ ) inhibitor with antiarrhythmic action ) on ritodrine does not modify the value of ritodrine in prolonging pregnancy , but clearly diminishes the incidence of maternal tachycardia and hypotension .
C0042523
verapamil
C0020649
hypotension