Before taking lenvatinib,
tell your doctor and pharmacist if you are allergic to lenvatinib, any other medications, or any of the ingredients in lenvatinib capsules. Ask your pharmacist for a list of the ingredients.
tell your doctor and pharmacist what other prescription and nonprescription medications, vitamins, nutritional supplements, and herbal products you are taking or plan to take. Be sure to mention any of the following: certain medications for irregular heartbeat including amiodarone (Cordarone, Nexterone, Pacerone), disopyramide (Norpace), procainamide, quinidine (in Nuedexta), and sotalol (Betapace, Betapace AF, Sorine, Sotylize). Your doctor may need to change the doses of your medications or monitor you carefully for side effects.
tell your doctor if you have or have ever had seizures, high blood pressure, a stroke, a heart attack, headaches, changes in vision, especially those due to blood clots, a fistula (abnormal connection between 2 organs inside your body or between an organ and the outside of your body), a tear in the wall of your stomach or intestine, QT interval prolongation (an irregular heart rhythm that can lead to fainting, loss of consciousness, seizures, or sudden death), low levels of calcium, potassium, or magnesium in your blood, bleeding problems, or heart, kidney, or liver disease.
you should know that lenvatinib may decrease fertility in men and women. However, you should not assume that you or your partner cannot become pregnant. Tell your doctor if you are pregnant or plan to become pregnant. If you can become pregnant, you should use birth control during your treatment with lenvatinib and for at least 2 weeks after your treatment. If you become pregnant while you are taking lenvatinib, call your doctor immediately. Lenvatinib may harm the fetus.
tell your doctor if you are breastfeeding or plan to breastfeed. You should not breastfeed while taking lenvatinib.
you should know that your blood pressure may increase during your treatment with lenvatinib. Your doctor will probably monitor your blood pressure during your treatment.