SIDE EFFECTS: See also Warning section. Nausea, decreased appetite, changes in taste, dry mouth, stomach pain, vomiting, diarrhea, headache, or blurred vision may occur. Nail problems (such as nail bed swelling/tenderness/infection) may also occur. If any of these effects persist or worsen, tell your doctor or pharmacist promptly. If you have persistent/severe diarrhea or vomiting, your doctor may need to check your blood mineral levels and adjust your vandetanib treatment. Temporary hair loss may occur. Normal hair growth should return after treatment has ended. Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects. Vandetanib can commonly cause a rash that is usually not serious. Mild to moderate skin reactions include acne, dry skin, or a mildly irritated/red/itchy rash. However, you may not be able to tell it apart from a rare rash that could be a sign of a severe reaction. Therefore, get medical help right away if you develop any rash. Tell your doctor right away if you have any serious side effects, including: redness/pain/swelling of the palms of the hands or soles of the feet, depression, signs of heart failure (such as shortness of breath, swelling ankles/feet, unusual tiredness, unusual/sudden weight gain), signs of an underactive thyroid (such as weight gain, cold intolerance, slow heartbeat, constipation, unusual tiredness). This medication may raise your blood pressure. Check your blood pressure regularly and tell your doctor if the results are high. Vandetanib may cause a rare (possibly fatal) type of breathing problem (interstitial lung disease). Get medical help right away if you have sudden/worsening shortness of breath, cough, or fever. Vandetanib may also rarely cause a serious brain condition. Get medical help right away if you develop headaches, seizures, vision changes, confusion, or problems thinking. Get medical help right away if you have any serious side effects, including: signs of bleeding (such as bloody vomit, vomit that looks like coffee grounds, black/bloody stools), signs of a stroke (such as weakness on one side of the body, slurred speech, sudden vision changes, confusion). A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, blisters, peeling skin, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing, fever, joint pain. This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist. In the US - Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at www.fda.gov/medwatch. In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

PRECAUTIONS: See also Warning section. Before taking vandetanib, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details. Before using this medication, tell your doctor or pharmacist your medical history, especially of: kidney disease, high blood pressure, recent bleeding (including recently coughing up blood). This drug may cause blurred vision. Do not drive, use machinery, or do any activity that requires clear vision until you are sure you can perform such activities safely. This medication may make you more sensitive to the sun. Limit your time in the sun. Avoid tanning booths and sunlamps. Use sunscreen and wear protective clothing when outdoors. Get medical help right away if you get sunburned or have skin blisters/redness. Follow these instructions while taking vandetanib and for 4 months after stopping treatment. Before having surgery, tell your doctor or dentist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products). Older adults may be more sensitive to the side effects of this drug, especially QT prolongation (see also Warning section). Since this drug can be absorbed through the skin and lungs and may harm an unborn baby, women who are pregnant or who may become pregnant should not handle this medication or breathe the dust from the tablets. This medication is not recommended for use during pregnancy. It may harm an unborn baby. Women of child-bearing age should avoid becoming pregnant during treatment and for at least 4 months after stopping treatment. Discuss the use of reliable forms of birth control for this time frame with your doctor. If you become pregnant or think you may be pregnant, tell your doctor right away. It is unknown if this drug passes into breast milk. However, because of the possible undesirable effects on a nursing infant, breast-feeding while using this drug is not recommended. Consult your doctor before breast-feeding.

DRUG INTERACTIONS: 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. Many drugs besides vandetanib may affect the heart rhythm (QT prolongation), including amiodarone, chloroquine, disopyramide, dofetilide, dolasetron, granisetron, haloperidol, methadone, moxifloxacin, pimozide, procainamide, sotalol, macrolide antibiotics (such as clarithromycin), among others. Other medications can affect the removal of vandetanib from your body, which may affect how vandetanib works. Examples include dexamethasone, St. John's wort, rifamycins (such as rifabutin, rifampin), drugs used to treat seizures (such as carbamazepine, phenytoin, phenobarbital, primidone), among others.

OVERDOSE: If someone has overdosed and has serious symptoms such as passing out or trouble breathing, call 911. Otherwise, call a poison control center right away. US residents can call their local poison control center at 1-800-222-1222. Canada residents can call a provincial poison control center. Symptoms of overdose may include: rash, diarrhea, high blood pressure.