- It is used to treat or prevent asthma.
- This drug is not helpful during an asthma attack.
- If you have an allergy to zafirlukast or any other part of this drug.
- If you are allergic to any drugs like this one, any other drugs, foods, or other substances. Tell your doctor about the allergy and what signs you had, like rash; hives; itching; shortness of breath; wheezing; cough; swelling of face, lips, tongue, or throat; or any other signs.
- If you have liver disease.
- Tell dentists, surgeons, and other doctors that you use this drug.
- Do not use this drug to treat an asthma attack. Use a rescue inhaler. Talk with your doctor.
- If you are not able to get a breathing attack under control, get help right away.
- Call your doctor right away if your normal dose does not work as well or if you need to use your inhaler more often.
- This drug may cause very bad or deadly liver problems in some patients. Some people have needed a liver transplant. Talk with your doctor.
- Have blood work checked as you have been told by the doctor. Talk with the doctor.
- If you are 65 or older, use this drug with care. You could have more side effects.
- Tell your doctor if you are pregnant or plan on getting pregnant. You will need to talk about the benefits and risks of using this drug while you are pregnant.
- Tell your doctor if you are breast-feeding. You will need to talk about any risks to your baby.
- Signs of an allergic reaction, like rash; hives; itching; red, swollen, blistered, or peeling skin with or without fever; wheezing; tightness in the chest or throat; trouble breathing or talking; unusual hoarseness; or swelling of the mouth, face, lips, tongue, or throat.
- Signs of liver problems like dark urine, feeling tired, not hungry, upset stomach or stomach pain, light-colored stools, throwing up, or yellow skin or eyes.
- Signs of low mood (depression), thoughts of killing yourself, nervousness, emotional ups and downs, thinking that is not normal, anxiety, or lack of interest in life.
- Swelling in hands or feet.
- A burning, numbness, or tingling feeling that is not normal.
- Shortness of breath.
- Change in the way you act.
- Chest pain.
- Sinus irritation.
- Belly pain.
- Upset stomach or throwing up.
- Loose stools (diarrhea).
- Take as you have been told, even if you feel well.
- Take this drug at the same time of day.
- To gain the most benefit, do not miss doses.
- Take even during sign-free periods.
- Take on an empty stomach. Take 1 hour before or 2 hours after meals.
- Take a missed dose as soon as you think about it.
- If it is close to the time for your next dose, skip the missed dose and go back to your normal time.
- Do not take 2 doses at the same time or extra doses.
- Store in the original container at room temperature.
- Protect from light.
- Store in a dry place. Do not store in a bathroom.
- Keep all drugs out of the reach of children and pets.
- Check with your pharmacist about how to throw out unused drugs.
- If your symptoms or health problems do not get better or if they become worse, call your doctor.
- Do not share your drugs with others and do not take anyone else’s drugs.
- Keep a list of all your drugs (prescription, natural products, vitamins, OTC) with you. Give this list to your doctor.
- Talk with the doctor before starting any new drug, including prescription or OTC, natural products, or vitamins.
- Some drugs may have another patient information leaflet. If you have any questions about this drug, please talk with your doctor, pharmacist, or other health care provider.
- If you think there has been an overdose, call your poison control center or get medical care right away. Be ready to tell or show what was taken, how much, and when it happened.
If you have any questions or concerns, talk with a member of your healthcare team. You can reach them Monday through Friday from 9:00 am to 5:00 pm at ____________________. After 5:00 pm, during the weekend, and on holidays, please call____________________. If there’s no number listed, or you’re not sure, call
Zafirlukast©2015 Memorial Sloan Kettering Cancer Center - Generated on October 4, 2015