Singulair Side Effects

Side effects of Singulair are usually mild, and genenrally did not cause patients to stop taking their prescriptions. The side effects in patients treated with Singulair were similar to type and frequency to side effects in patients who were given a placebo.

The most common side effects of Singulair are:

  • Stomach pain
  • Stomach or intestinal upset
  • Heartburn
  • Tiredness
  • Fever
  • Stuffy nose
  • Cough
  • Flu
  • Upper respiratory infection
  • Dizziness
  • Headache
  • Rash


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Less common side effects of Singulair are:

  • Agitation including aggressive behaviour
  • Allergic reactions including swelling of the face, lips, tongue, and/or throat
  • Hives
  • Bad/vivid dreams
  • Increased bleeding tendency
  • Bruising
  • Diarrhea
  • Hallucinations
  • Indigestion
  • Irritability
  • Joint pain
  • muscle aches and cramps
  • trouble sleeping
  • vomiting

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