Zanika Drug Interactions

Digoxin: Concomitant hydroxychloroquine sulfate and digoxin therapy may result in increased serum digoxin levels. Serum digoxin levels should be closely monitored in patients receiving combined therapy.
Insulin or antidiabetic drugs: As hydroxychloroquine sulfate may enhance the effects of a hypoglycemic treatment, a decrease in doses of insulin or antidiabetic drugs may be required.
Drugs that prolong QT interval and other arrhythmogenic drugs: Hydroxychloroquine sulfate prolongs the QT interval and should not be administered with other drugs that have the potential to induce cardiac arrhythmias. Also, there may be an increased risk of inducing ventricular arrythmias if hydroxychloroquine sulfate is used concomitantly with other arrhythmogenic drugs.
Mefloquine and other drugs known to lower the convulsive threshold: Hydroxychloroquine sulfate can lower the convulsive threshold. Co-administration of hydroxychloroquine sulfate with other antimalarials known to lower the convulsion threshold (e.g., mefloquine) may increase the risk of convulsions.
Antiepileptics: The activity of antiepileptic drugs might be impaired when co-administered with hydroxychloroquine sulfate.
Methotrexate: Combined use of methotrexate with hydroxychloroquine sulfate has not been studied and may increase the incidence of adverse effects.
Cyclosporin: An increased plasma cyclosporin level was reported when cyclosporin and hydroxychloroquine sulfate were co-administered.
The following interactions have been observed on treatment with the structurally related substance chloroquine phosphate, and therefore cannot be ruled out for hydroxychloroquine.
Praziquantel: Chloroquine has been reported to reduce the bioavailability of praziquantel.
Antacids and kaolin: Antacids and kaolin can reduce absorption of chloroquine; an interval of at least 4 hours between intake of these agents and chloroquine should be observed.
Cimetidine: Cimetidine can inhibit the metabolism of chloroquine, increasing its plasma level. Concomitant use of cimetidine should be avoided.
Ampicillin: In a study of healthy volunteers, chloroquine significantly reduced the bioavailability of ampicillin.