(tore em' i feen)
Toremifene may cause QT prolongation (an irregular heart rhythm that can lead to fainting, loss of consciousness, seizures, or sudden death). Tell your doctor if you or anyone in your family has or has ever had long QT syndrome (an inherited condition in which a person is more likely to have QT prolongation) or you have or have ever had low levels of potassium or magnesium in your blood, an irregular heartbeat, heart failure, or liver disease. Tell your doctor and pharmacist if you are taking amitriptyline (Elavil); antifungals such as ketoconazole (Nizoral), itraconazole (Sporanox), or voriconazole (Vfend); clarithromycin (Biaxin, in Prevpac); erythromycin (E.E.S., E-Mycin, Erythrocin); granisetron (Kytril); haloperidol (Haldol); certain medications for human immunodeficiency virus (HIV) or acquired immunodeficiency syndrome (AIDS) such as atazanavir (Reyataz), indinavir (Crixivan), nelfinavir (Viracept), ritonavir (Norvir, in Kaletra), and saquinavir (Invirase); certain medications for irregular heartbeat such as amiodarone (Cordarone, Pacerone), disopyramide (Norpace), dofetilide (Tikosyn), ibutilide (Corvert), procainamide (Procanbid, Pronestyl), quinidine, and sotalol (Betapace, Betapace AF); levofloxacin (Levaquin); nefazodone; ofloxacin; ondansetron (Zofran); telithromycin (Ketek); thioridazine; and venlafaxine (Effexor). If you experience any of the following symptoms, stop taking toremifene and call your doctor immediately: fast, pounding, or irregular heartbeat; fainting; loss of consciousness; or seizures.
Keep all appointments with your doctor and the laboratory. Your doctor will order certain lab tests to check your body's response to toremifene. Your doctor also may order electrocardiograms (EKGs, tests that record the electrical activity of the heart) before and during your treatment to be sure that it is safe for you to take toremifene.
Talk to your doctor about the risks of taking toremifene.