Side effects of SINGULAIR
Merck Sharp & Dohme Corp., a subsidiary of Merck and Co., Inc.

POSSIBLE SIDE EFFECTS

What are the possible side effects of SINGULAIR?

SINGULAIR may cause serious side effects.

Behavior and mood-related changes have been reported. Tell your healthcare provider right away if you or your child have any of these symptoms while taking SINGULAIR:

  • agitation including aggressive behavior or hostility
  • bad or vivid dreams
  • depression
  • disorientation (confusion)
  • feeling anxious
  • hallucination (seeing or hearing things that are not really there)
  • irritability
  • restlessness
  • sleep walking
  • suicidal thoughts and actions (including suicide)
  • tremor
  • trouble sleeping

Increase in certain white blood cells (eosinophils) and possible inflamed blood vessels throughout the body (systemic vasculitis). Rarely, this can happen in people with asthma who take SINGULAIR. This usually, but not always, happens in people who also take a steroid medicine by mouth that is being stopped or the dose is being lowered.

Tell your healthcare provider right away if you get one or more of these symptoms:

  • a feeling of pins and needles or numbness of arms or legs
  • a flu-like illness
  • rash
  • severe inflammation (pain and swelling) of the sinuses (sinusitis)

The most common side effects with SINGULAIR include:

  • upper respiratory infection
  • fever
  • headache
  • sore throat
  • cough
  • stomach pain
  • diarrhea
  • earache or ear infection
  • flu
  • runny nose
  • sinus infection

Other side effects with SINGULAIR include:

  • increased bleeding tendency
  • allergic reactions [including swelling of the face, lips, tongue, and/or throat (which may cause trouble breathing or swallowing), hives and itching]
  • dizziness, drowsiness, pins and needles/numbness, seizures (convulsions or fits)
  • palpitations
  • nose bleed, stuffy nose
  • diarrhea, heartburn, indigestion, inflammation of the pancreas, nausea, stomach or intestinal upset, vomiting
  • hepatitis
  • bruising, rash
  • joint pain, muscle aches and muscle cramps
  • tiredness, swelling

Tell your healthcare provider if you have any side effect that bothers you or that does not go away.
These are not all the possible side effects of SINGULAIR. For more information ask your healthcare provider or pharmacist.

You are encouraged to report negative side effects of prescription drugs to the FDA. Visit www.fda.gov/medwatch, or call 1-800-FDA-1088.

Please read the Patient Information and discuss it with your doctor. The physician Prescribing Information also is available.

SINGULAIR is a registered trademark of Merck Sharp & Dohme Corp., a subsidiary of  Merck & Co., Inc.
20852779(12)-06/10-SNG

 

Is your or your child's asthma really under control? Or do you just think it is?

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