SIDE EFFECTS: See also Warning section. Headache, dizziness, constipation, or loss of appetite may occur. If any of these effects persist or worsen, tell your doctor or pharmacist promptly. 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. Tell your doctor right away if you have any serious side effects, including: weight gain, numb/tingling skin, pain/numbness/burning feeling in fingers/toes, fainting, fast/slow/irregular/pounding heartbeat, eye pain/swelling/irritation, blurred vision/vision problems, problems thinking. Ponatinib sometimes causes side effects due to the rapid destruction of cancer cells (tumor lysis syndrome). To lower your risk, your doctor may add a medication and tell you to drink plenty of fluids. Tell your doctor right away if you have symptoms such as: low back/side pain (flank pain), signs of kidney problems (such as painful urination, pink/bloody urine, change in the amount of urine), muscle spasms/weakness. Get medical help right away if you have any very serious side effects, including: unusual bleeding/bruising, black/bloody stools, vomit that contains blood or looks like coffee grounds, shortness of breath, seizures. 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. This medication may lower your ability to fight infections. This may make you more likely to get a serious infection or make any infection you have worse. Tell your doctor right away if have any signs of infection (such as fever, chills, persistent sore throat, cough). For women of childbearing age, ponatinib may affect your ability to have children. Ask your doctor for more details. 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 ponatinib, 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: liver disease, heart problems (such as history of heart attack, angina, high blood pressure), previous stroke or "mini-stroke" (transient ischemic attack), diabetes, high cholesterol, tobacco use. This drug may make you dizzy or blur your vision. Alcohol or marijuana can make you more dizzy. Do not drive, use machinery, or do anything that needs alertness or clear vision until you can do it safely. Limit alcoholic beverages. Talk to your doctor if you are using marijuana. Before having surgery, tell your doctor or dentist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products). Do not have immunizations/vaccinations without the consent of your doctor. Avoid contact with people who have recently received live vaccines (such as flu vaccine inhaled through the nose). To lower the chance of getting cut, bruised, or injured, use caution with sharp objects like razors and nail cutters, and avoid activities such as contact sports. Older adults may be more sensitive to the side effects of this drug, especially unusual bleeding/bruising, blood clots, swollen legs/ankles, muscle spasms, weakness, loss of appetite. Tell your doctor if you are pregnant or plan to become pregnant. You should not become pregnant while taking ponatinib. Ponatinib may harm an unborn baby. Your doctor will do a pregnancy test before you start taking this medication. Ask about reliable forms of birth control while taking this medication and for 3 weeks after stopping treatment. If you become pregnant, talk to your doctor right away about the risks and benefits of this medication. It is unknown if this medication passes into breast milk. Because of the possible risk to the infant, breast-feeding while using this drug and for 6 days after stopping treatment is not recommended. Consult your doctor before breast-feeding.

DRUG INTERACTIONS: See also How to Use section. 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 ponatinib from your body, which may affect how ponatinib works. Examples include azole antifungals (such as itraconazole), macrolide antibiotics (such as erythromycin), HIV protease inhibitors (such as lopinavir, ritonavir), rifamycins (such as rifabutin), drugs for seizures (such as phenytoin), St. John's wort, 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.