Important Safety Information about DASANIX

It is not known if DASANIX is safe and effective in children younger than 18 years old.

Before taking DASANIX, tell your doctor about all of your medical conditions, including if you:

• have problems with your immune system
• have liver problems
• have heart problems, including a condition called congenital long QT syndrome
• have low potassium or low magnesium levels in your blood
• are lactose (milk sugar) intolerant
• are pregnant or plan to become pregnant. DASANIX can harm your unborn baby. If you are able to become pregnant, you should use effective birth control during treatment and for 30 days after your final dose of DASANIX. Talk to your healthcare provider right away if you become pregnant during treatment with DASANIX
• are breastfeeding or plan to breastfeed. It is not known if DASANIX passes into your breast milk. You should not breastfeed during treatment and for 2 weeks after your final dose of DASANIX

Tell your healthcare provider about all the medicines you take, including prescription and over-the-counter medicines, vitamins, antacids, and herbal supplements. If you take an antacid medicine, take it 2 hours before or 2 hours after your dose of DASANIX.

Take DASANIX exactly as your healthcare provider tells you to take it
• Your healthcare provider may change your dose of DASANIX or temporarily stop treatment with DASANIX. Do not change your dose or stop taking DASANIX without first talking to your healthcare provider
• Take DASANIX one (1) time a day
• Take DASANIX with or without food, either in the morning or in the evening
• Swallow DASANIX tablets whole with water. Do not cut or crush the tablets
• You should not drink grapefruit juice during treatment with DASANIX
• If you miss a dose of DASANIX, take your next scheduled dose at your regular time. Do not take two doses at the same time
• If you take too much DASANIX, call your healthcare provider or go to the nearest hospital emergency room right away

DASANIX may cause serious side effects, including:
Low Blood Cell Counts: Low blood cell counts are common with DASANIX and can be severe, including low red blood cell counts (anemia), low white blood cell counts (neutropenia), and low platelet counts (thrombocytopenia). Your healthcare provider will do blood tests to check your blood cell counts regularly during your treatment with DASANIX. Call your healthcare provider right away if you have a fever or any signs of an infection during treatment with DASANIX
Bleeding problems: DASANIX may cause severe bleeding that can lead to death. Call your healthcare provider right away if you have:
o unusual bleeding or bruising of your skin
o bright red or dark tar-like stools
o decreased alertness, headache, or change in speech
• Your body may hold too much fluid (fluid retention): Fluid retention is common with DASANIX and can sometimes be severe. In severe cases, fluid may build up in the lining of your lungs, the sac around your heart, or your stomach cavity. Call your healthcare provider right away if you get any of these symptoms during treatment with DASANIX:
o swelling all over your body
o weight gain
o shortness of breath and cough, especially if this happens with low levels of physical activity or at rest
o chest pain when taking a deep breath
Heart problems: DASANIX may cause an abnormal heart rate, heart problems, or a heart attack that can lead to death. Your healthcare provider will monitor the potassium and magnesium levels in your blood, and your heart function
Pulmonary Arterial Hypertension (PAH): DASANIX may cause high blood pressure in the vessels of your lungs. PAH may happen at any time during your treatment with DASANIX. Your healthcare provider should check your heart and lungs before and during your treatment with DASANIX. Call your healthcare provider right away if you have shortness of breath, tiredness, or swelling all over your body (fluid retention)
Severe skin reactions: DASANIX may cause skin reactions that can sometimes be severe. Get medical help right away if you get a skin reaction with fever, sore mouth or throat, or blistering or peeling of your skin or in the mouth
Tumor Lysis Syndrome (TLS): TLS is caused by a fast breakdown of cancer cells. TLS can cause kidney failure and an abnormal heart beat. Kidney failure may require the need for dialysis treatment. Your healthcare provider may do blood tests to check you for TLS

Side effects of DASANIX which are considered common include: diarrhea, headache, tiredness, nausea, shortness of breath, skin rash, muscle pain, and fever.

Tell your healthcare provider if you have any side effect that bothers you or that does not go away. These are not all of the possible side effects of DASANIX.