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Medication Detail

image of medication detailed on this page

Medication Type

Long Term Control, should be taken every day as prescribed

Generic Names


Brand Names



This medication is an oral tablet used for long term treatment of asthma in adults and children over 5 years of age. It works by decreasing the body’s response to allergens.


Oral tablet


  • Adults and children ≥ 12 years of age: 20mg twice a day
  • Children 5 to 11 years: 10 mg twice daily

Proper Use

  • See instructions for proper use. Take this medication at the same time each day.
  • Take on empty stomach, at least one hour before or two hours after meals.


  • Do NOT use this drug to treat an asthma attack.
  • Continue to use this medication as prescribed, even if asthma symptoms are not present.
  • This medication should not be used in patients with liver disease, including hepatic cirrhosis.

Common Interactions

Some of the medications Zafirlukast interacts with includes aripiprazole, carvedilol, erythromycin, theophylline and warfarin.

Tell your doctor and pharmacist about all of your medications and health problems so they can check for any interactions.

Possible Side Effects

Possible side effects include headache, dizziness, nausea, vomiting, diarrhea, abdominal pain and stomach upset.

Tell your doctor or seek medical attention if you notice any signs of an allergic reaction (rash, hives, wheezing, trouble breathing), signs of liver problems (dark urine, light-colored stools), or new symptoms of depression.

Proper Storage

  • Store in the original container at room temperature.
  • Protect from heat, light, and moisture.
  • Do not store in a bathroom.

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