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Most Commonly Used

Singulair 10mg Tab
Merck Sharp & Dohme Corp., a Subsidiary of Merck & Co., Inc.
Pill Identification: MSD 117  |  SINGULAIR
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Singulair 5mg Chw Tab
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Singulair 4mg Granules
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Singulair 4mg Chw Tab
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Singulair 5mg Chw Tab
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Also See:

  • Answers to Frequently-Asked Questions (FAQs)
  • Other Class Related Drugs
  • Additional Patient Usage Statistics

Common Side Effects of Singulair
Before taking Singulair, tell your doctor about any health issues you may have. He or she may specifically ask whether you've had an allergic reaction to any medicines, including montelukast and aspirin. Before taking Singulair, tell your doctor about any medicines you take, even over-the-counter medicines, herbal remedies, vitamins, and supplements. Patients who have phenylketonuria (PKU) should be advised that chewable Singulair tablets contain phenylalanine. Let your doctor know if you are pregnant, breast-feeding, or planning to become pregnant.

Singulair may cause side effects. The more common side effects of Singulair include:
  • Headache
  • Sore throat
  • Cough
  • Fever
  • Stomach pain
  • Diarrhea
  • Ear infection
  • Tooth infection
  • Runny nose
  • Influenza (flu)
More serious side effects can happen when taking Singulair. Call your doctor right away, or 911 in an emergency, if you notice:
  • Signs of an allergic reaction: itching, hives, or swelling of the face, lips, or throat, which can cause trouble breathing
  • Extreme changes in behavior or mood
  • Restlessness, anxiety, or irritability
  • Irregular heartbeat
  • Seizures or tremors
  • Unusual bruising or bleeding
  • Numbness or swelling in hands, arms, feet, or legs
  • Yellowing of the skin or whites of eyes
  • Worsening of an asthma attack
This is not a complete list of side effects of Singulair. Tell your doctor about any symptoms you notice while taking Singulair.