التداخل بين ديكستروميثورفان وكينيدين وكينيدين

Thrombocytopenia and Other Hypersensitivity Reactions Quinidine can cause immune-mediated thrombocytopenia that can be severe or fatal.

Digoxin Quinidine is an inhibitor of P-glycoprotein.

Proarrhythmic effects Like many other drugs (including all other Class Ia antiarrhythmics), quinidine prolongs the QT c interval, and this can lead to torsades de pointes , a life-threatening ventricular arrhythmia (see OVERDOSAGE ).

Altered pharmacokinetics of other drugs: Quinidine slows the elimination of digoxin and simultaneously reduces digoxin's apparent volume of distribution.

Altered pharmacodynamics of other drugs: Quinidine's anticholinergic, vasodilating, and negative inotropic actions may be additive to those of other drugs with these effects, and antagonistic to those of drugs with cholinergic, vasoconstricting, and positive inotropic effects.

The effects (if any) of coadministration of other β-blockers on quinidine pharmacokinetics have not been adequately studied.

In one neonate whose mother had received quinidine throughout her pregnancy, the serum level of quinidine was equal to that of the mother, with no apparent ill effect.