 Aminophylline amobarbital ephedrine and dexchlorpheniramine dextromethorphan phenylephrine pyrilamine Drug Interactions - Drugs.comDrug interactions between aminophylline amobarbital ephedrine and dexchlorpheniramine dextromethorphan phenylephrine pyrilamineApplies to: aminophylline amobarbital ephedrine and dexchlorpheniramine dextromethorphan phenylephrine pyrilamine 