Tell your doctor of any nonprescription or prescription medication you may take, particularly: narcotic pain relievers, tranquilizers, sleeping pills, anti-anxiety drugs, antidepressants, "water pills" (diuretics such as furosemide). Report other drugs which affect the heart rhythm (QTc prolongation), such as: dofetilide, pimozide, quinidine, sotalol, procainamide, sparfloxacin. Ask your doctor or pharmacist for more details. Droperidol may reverse the effects of epinephrine. Do not start or stop any medicine without doctor or pharmacist approval.