 Aminophylline ephedrine phenobarbital potassium iodide and VazoTuss HC Drug Interactions - Drugs.comDrug interactions between aminophylline ephedrine phenobarbital potassium iodide and VazoTuss HCApplies to: aminophylline ephedrine phenobarbital potassium iodide and VazoTuss HC brompheniramine hydrocodone phenylephrine 