What are the possible side effects of Singulair?
Side effects cannot be anticipated. If any develop or change in intensity, tell your doctor as soon as possible. Only your doctor can determine if it is safe for you to continue taking this drug. Side effects may include: upper respiratory infection, sinus infection, earache or ear infection, flu, fever, headache, sore throat, cough, stomach pain, diarrhea, runny nose Tell your doctor immediately if you experience behavior or mood-related changes (e.g., agitation, depression, anxiety, restlessness, etc.) or any tingling or numbness in your arms or legs, a rash, flulike illness or severe sinus inflammation.
