More Information on Reactions to Singulair

Common Singulair Side Effects in Children

In clinical studies, common Singular side effects (occurring in at least 2 percent of children) included:

Serious Singulair Side Effects

Some side effects with Singulair are potentially serious and should be reported immediately to your healthcare provider. These include, but are not limited to:
  • Worsening of asthma or allergies
  • Any changes in mood or behavior, including but not limited to:



  • Tingling, numbness, or "pins and needles" sensations in the arms or legs
  • Flu-like symptoms
  • Severe swelling or pain in your sinuses
  • Unusual bruising or bleeding
  • Seizure
  • A fast, pounding, irregular, or fluttering heartbeat  
  • Signs of liver damage, such as:
    • Yellow eyes or skin
    • Dark urine
    • Upper abdominal pain
  • Signs of an allergic reaction, including:
    • Unexplained rash
    • Hives
    • Itching
    • Unexplained swelling.


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