SIDE EFFECTS: Weight loss, nausea/vomiting, diarrhea, loss of appetite, changes in taste, dry skin, mouth sores, hair loss, voice changes, or tiredness may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly. People using this medication may have serious side effects. However, your doctor has prescribed this drug because he or she has judged that the benefit to you is greater than the risk of side effects. Careful monitoring by your doctor may decrease your risk. This medication may raise your blood pressure. Check your blood pressure regularly and tell your doctor if the results are high. Your doctor may control your blood pressure with medication. Treatment with this drug may sometimes cause your hands/feet to develop a skin reaction called hand-foot syndrome. Tell your doctor right away if you experience swelling, pain, redness, blisters, or tingling/burning of the hands/feet. Depending on how severe your hand-foot syndrome is, your doctor may give you an additional medication to reduce the symptoms, or may stop or delay your sorafenib treatment. This medication can affect how your thyroid works. Tell your doctor right away if you have signs of an underactive thyroid (such as weight gain, cold intolerance, slow heartbeat, constipation, or unusual tiredness) or signs of an overactive thyroid (such as mental/mood changes, heat intolerance, unusual weight loss). Tell your doctor right away if you have any serious side effects, including: easy bruising/bleeding, signs of liver disease (such as nausea/vomiting that doesn't stop, stomach/abdominal pain, yellowing eyes/skin, dark urine), numb/tingling skin, muscle spasms, signs of infection (such as sore throat that doesn't go away, fever). Get medical help right away if you have any very serious side effects, including: chest/jaw/left arm pain, unusual sweating, fast/irregular heartbeat, severe dizziness, fainting, vomit that looks like coffee grounds, black/bloody stools. Sorafenib can commonly cause a rash that is usually not serious. However, you may not be able to tell it apart from a rare rash that could be a sign of a severe reaction. Get medical help right away if you develop any rash. 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, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing. 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: Before taking sorafenib, 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: bleeding problems, heart disease (such as heart attack, coronary artery disease), high blood pressure, liver disease. Sorafenib may cause a condition that affects the heart rhythm (QT prolongation). QT prolongation can rarely cause serious (rarely fatal) fast/irregular heartbeat and other symptoms (such as severe dizziness, fainting) that need medical attention right away. The risk of QT prolongation may be increased if you have certain medical conditions or are taking other drugs that may cause QT prolongation. Before using sorafenib, tell your doctor or pharmacist of all the drugs you take and if you have any of the following conditions: certain heart problems (heart failure, slow heartbeat, QT prolongation in the EKG), family history of certain heart problems (QT prolongation in the EKG, sudden cardiac death). Low levels of potassium or magnesium in the blood may also increase your risk of QT prolongation. This risk may increase if you use certain drugs (such as diuretics/"water pills") or if you have conditions such as severe sweating, diarrhea, or vomiting. Talk to your doctor about using sorafenib safely. 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 above). 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. Tell your doctor if you are pregnant or plan to become pregnant. You should not become pregnant while using sorafenib. Sorafenib may harm an unborn baby. Males and females using this drug should ask about reliable forms of birth control during treatment and for 2 weeks after stopping treatment. If you or your partner become pregnant, talk to your doctor right away about the risks and benefits of this medication. It is unknown if this drug passes into breast milk. Because of the possible risk to the 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. Other medications can affect the removal of sorafenib from your body, which may affect how sorafenib works. Examples include rifamycins (such as rifampin, rifabutin), St. John's wort, drugs used to treat seizures (such as carbamazepine, phenytoin), 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.