Chemical Name: zafirlukast

Description
Zafirlukast is used to prevent asthma symptoms. It works by blocking the action of substances that cause inflammation, fluid retention, mucous secretion, and constriction in your lungs.

This medication is sometimes prescribed for other uses; ask your doctor or pharmacist for more information.

How should this medicine be used?

Zafirlukast comes as a tablet to take by mouth. It usually is taken two times a day. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take zafirlukast exactly as directed. Do not take more or less of it or take it more often than prescribed by your doctor.

Zafirlukast controls asthma symptoms but does not cure them. Continue to take zafirlukast even if you feel well. Do not stop taking zafirlukast without talking to your doctor.

What special precautions should I follow?

Before taking zafirlukast,

tell your doctor and pharmacist if you are allergic to zafirlukast or any other drugs.
tell your doctor and pharmacist what prescription and nonprescription medications you are taking, especially anticoagulants ('blood thinners') such as warfarin (Coumadin), aspirin, erythromycin, terfenadine (Seldane), theophylline (Theo-Dur), and vitamins.
tell your doctor if you have or have ever had liver disease.
tell your doctor if you are pregnant, plan to become pregnant, or are breast-feeding. If you become pregnant while taking zafirlukast, call your doctor.
What special dietary instructions should I follow?

Take zafirlukast either 1 hour before or 2 hours after a meal.

What should I do if I forget a dose?

Take the missed dose as soon as you remember it. However, if it is almost time for the next dose, skip the missed dose and continue your regular dosing schedule. Do not take a double dose to make up for a missed one.

What side effects can this medication cause?

Although side effects from zafirlukast are not common, they can occur. Tell your doctor if any of these symptoms are severe or do not go away.

headache
vomiting
diarrhea
dizziness
muscle or joint pain
If you experience any of the following symptoms, call your doctor immediately.

upset stomach
pain in the right upper part of your stomach
fatigue
lack of energy
itching
yellowing of the skin or eyes
loss of appetite
flu-like symptoms
cold or infection that lasts a long time
rash
increased difficulty breathing
What storage conditions are needed for this medicine?

Keep this medication in the container it came in, tightly closed, and out of reach of children. Store it at room temperature and away from excess heat and moisture (not in the bathroom). Throw away any medication that is outdated or no longer needed. Talk to your pharmacist about the proper disposal of your medication.

In case of emergency/overdose

In case of overdose, call your local poison control center at 1-800-222-1222. If the victim has collapsed or is not breathing, call local emergency services at 911.