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“Graded concentrations of salbutamol, isoproterenol, papaverine, theophylline , thioglycollate, and MgCl2 produced a decrease in the maximal effect of oxytocin and a shift of the concentration-effect curves to the right.”
The Journal of pharmacology and experimental therapeutics • 1975 | View Paper
“Uterine contractions induced by oxytocin are also prevented by the administration of epinephrine together with theophylline or caffeine respectively, in doses which were ineffective by themselves.”