
The chewable tablet form of this medication may contain phenylalanine. Talk to your doctor before using this form of montelukast if you have phenylketonuria (PKU).

Singulair is currently approved in the US for use by adults and children 12 months and over for the relief of symptoms brought on by indoor and outdoor allergies. For outdoor allergies it is approved for use in adults and children down to 2 years old, for indoor allergies the youngest age limit is 6 months.

If you already take this medication to prevent asthma or allergy symptoms, do not use it for exercise-induced bronchoconstriction.

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