1 to 30 days: Interestingly, Singulair (montelukast) can have a first dose effect and start working on the first day, or, it can take up to about 30 days to notice an effect. If there has been no change in symptoms within 1 month, it is unlikely that additional doses are necessary.
Answered 3/4/2018
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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