Compare Singulair vs. Foradil

Head-to-head comparisons of medication uses, side effects, ratings, and more.



Prevents breathing problems. Singulair (Montelukast) has fewer side effects but doesn't work as well as steroid inhalers for asthma. It also helps with allergies.Coming soon.
Reviews & ratings
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Reviews for Singulair
of people (All ages) say Singulair is worth it
say it works well
say it's a big hassle
557 reviews
Have you used Singulair (montelukast)?
Worth itNot sureNot worth it

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Have you used Foradil (formoterol)?
Worth itNot sureNot worth it
Side effects
  • Pharyngitis 3%
  • Influenza 3%
  • Fever 3%
  • Sinusitis 3%
  • Nausea 3%
  • Diarrhea 3%
  • Dyspepsia 3%
  • Otitis 3%
  • Viral Infection 3%
  • Laryngitis 3%
More Singulair side effects »

We haven’t found good data for Foradil side effects.

FDA side effect reports for Foradil »
How it works
Singulair (Montelukast) is a leukotriene inhibitor. It lowers inflammation in your lungs and nasal passages to prevent asthma and relieve allergies.Coming soon.
Type of medication
Prescription only
Available as
  • Pill
  • Chewable tablet
  • Granule
  • Inhaler
Used for
  • Asthma Chronic Obstructive Pulmonary Disease Exercise Induced Asthma Prophylaxis
Risk factors for serious side effects
  • Exercise-induced asthma
  • Other environmental triggers
  • Recent treatment with corticosteroid medication
  • Lowering dose of corticosteroid medication
  • History of phenylketonuria (PKU)
Detailed Singulair (montelukast) risks & warnings »
    Coming soon.

    Research studies with animals haven’t found a risk to unborn babies, but it hasn’t been properly studied in humans.

    Research studies with animals found harmful effects on unborn babies. It hasn’t been properly studied in humans. The benefits might outweigh the risks even if you’re pregnant. Talk with your doctor.

    • Singulair (Montelukast) contains aspartame (phenylalanine). People who have phenylketonuria (PKU) can't break down the amino acid phenylalanine. It builds up and causes serious medical problems. If you have PKU, don't use this product.
    No food related info.
    Kidneys and liver
    • There are reports of liver injury in people taking Singulair (Montelukast) mostly in combination with other factors such as drugs, alcohol, and liver disease. If you have any of these risk factors, your doctor will need to check your liver function periodically.
    No kidneys and liver related info.
    Upsides and benefits
    • Prevents symptoms and improves lung function in children and adults with chronic asthma.
    • A single 10 mg dose improves exercise-induced asthma symptoms for up to 24 hours.
    • Fewer side effects compared to other asthma treatments.
    • Also relieves nasal allergy symptoms.
    • Effective pill alternative to corticosteroid inhalers.
    Coming soon
    Downsides and risks
    • You have to use Montelukast every day to control your symptoms.
    • Somewhat less effective than corticosteroid inhalers for asthma.
    • There's no generic available, so it can be expensive.
    • Can cause behavior changes, agitation, aggression, and difficulty sleeping for some people.
    Coming soon
    Tips from our pharmacists for people taking the medication
    • Take it once a day to control asthma and allergy symptoms.
    • If you're using it for asthma or allergies, take it in the evening.
    • Use it 2 hours before exercising.
    • Granules can be taken by mouth or dissolved in liquid or soft food.
    • Doesn't treat sudden wheezing or asthma attacks once they start. Keep a fast-acting (rescue) inhaler with you.
    • The chewable tablets contain aspartame, so don't use them if you have a sensitivity to phenylalanine or phenylketones.
    Coming soon
    Learn more
    More about SingulairSide effectsReviews & ratingsAlternativesFDA package insert
    Have you used Singulair (montelukast)?
    Worth itNot sureNot worth it
    More about ForadilSide effectsReviews & ratingsFDA package insert
    Have you used Foradil (formoterol)?
    Worth itNot sureNot worth it