A member asked:

How likely am i to experience the rare psychological side effects of singulair, (montelukast) and how soon would i notice them?

A doctor has provided 1 answer

Side Effects: The most common side effect of singulair (montelukast) is going to be fever, headaches. This happened at about 18% of patients. Around 2% of patients will have dizziness, fatigue. If you were going to develop symptoms, they will usually occur when you started taking the medication.

Answered 12/9/2016

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Side effects of singulair (montelukast) taken for allergies?

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