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Singulair

Most Commonly Used
Singulair 10mg Tab
Merck Sharp & Dohme Corp., a Subsidiary of Merck & Co., Inc.
Pill Identification: MSD 117  |  SINGULAIR
Drug Image file DrugItem_16563.JPG
Singulair 10mg Tab
Merck Sharp & Dohme Corp., a Subsidiary of Merck & Co., Inc.
Pill Identification: MRK 117  |  SINGULAIR
Drug Image file DrugItem_7138.JPG
Singulair 5mg Chw Tab
Drug Image file default-drug-image.png
Singulair 4mg Granules
Drug Image file default-drug-image.png
Singulair 5mg Chw Tab
Merck Sharp & Dohme Corp., a Subsidiary of Merck & Co., Inc.
Pill Identification: SINGULAIR  |  MRK 275
Drug Image file DrugItem_7140.JPG
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.