Quinidine sulfate 300mg; ext-rel tabs. Complete AV or bundle branch block or other severe intraventricular conduction defects. Myasthenia gravis. Arrhythmias due to digitalis intoxication ...

3,8 As dextromethorphan is a substrate for CYP2D6 and quinidine is an inhibitor of CYP2D6 and p-glycoprotein, there is the potential for drug interactions. 44 Dose reductions of desipramine ...

Consult your healthcare professional before taking or discontinuing any drug or commencing any course of treatment. Taking quinine with an antacid may prevent your body from absorbing quinine.Some ...