

For the medication to work properly, it must be taken as prescribed. It will not work if you stop taking it.

PREGNANCY: Montelukast crosses the placenta into the fetus following oral administration to animals, but there have been no adequate studies in pregnant women to determine the effects on the fetus. Physicians may prescribe zafirlukast during pregnancy if it is felt that its benefits outweigh the potential but unknown risks to the fetus.

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