Lenvatol 4mg is a prescription medicine that is used for thyroid cancer. Take it as directed by doctor. It has some common side effects such as bleeding, cough, skin redness, nausea, Peripheral edema, rash, skin peeling, stomach pain, tiredness, vomiting, weight loss, hoarseness of voice, itching, joint pain, mouth sore, and muscle pain. Tell your doctor, if you experience serious allergic reaction after taking medicine.