Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval.Some products that may interact with this drug include: apomorphine, drugs that can slow the heart rate (such as beta blockers including atenolol, calcium channel blockers including verapamil), cimetidine, previous treatment with certain chemotherapy drugs (anthracyclines such as daunorubicin/doxorubicin), rifamycins (e.g., rifampin).Many drugs besides dolasetron may affect the heart rhythm (QT prolongation), including dofetilide, pimozide, procainamide, amiodarone, quinidine, ziprasidone, sotalol, macrolide antibiotics (such as erythromycin), among others. Therefore, before using dolasetron, report all medications you are currently using to your doctor or pharmacist.