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Disclaimer: This guide is for education only and is not a substitute for professional medical advice. Always confirm medicine, supplement and product decisions with your obstetrician, midwife, pharmacist or healthcare provider.

Medication

Is Montelukast Safe During Pregnancy?

Published 2026-07-22 | By SafeMama Editorial Team | Editorial policy

Is Montelukast Safe During Pregnancy? pregnancy safety guide image

Short answer

Montelukast may be continued or prescribed during pregnancy when asthma or allergy control needs it, but the decision should come from the clinician managing your breathing plan.

Clinician-guided asthma/allergy plan

What is the safest way to think about this?

NHS guidance says montelukast can be taken in pregnancy and emphasizes controlled asthma. MotherToBaby reports that available information has not suggested an increased birth-defect risk above background, but personal asthma severity and side effects still need clinician review.

What is generally okay?

  • Contact your asthma or pregnancy clinician if you become pregnant while taking montelukast.
  • Keep a written asthma plan, including rescue inhaler use and when to seek urgent care.
  • Discuss mood, sleep, behavior changes, depression or unusual thoughts promptly.

What should you avoid or double-check?

  • Avoid stopping asthma controller medicines abruptly because breathing problems can be dangerous in pregnancy.
  • Avoid using montelukast as a substitute for urgent care during an asthma flare.
  • Avoid ignoring new mental-health or sleep symptoms after starting or changing the medicine.

How SafeMama helps

SafeMama can flag montelukast, Singulair, asthma-controller labels, antihistamine combinations and breathing-symptom questions for clinician follow-up.

Open the SafeMama app, scan the barcode or search the ingredient, then use the result as a starting point for a conversation with your healthcare provider.

Sources

Frequently asked questions

Is Singulair the same as montelukast?

Yes. Singulair is a brand name for montelukast.

Should I stop montelukast when I find out I am pregnant?

Do not stop on your own. Contact your clinician so asthma or allergy control stays safe.

What asthma symptoms need urgent help?

Seek urgent care for severe shortness of breath, blue lips, chest tightness that does not respond to your plan, trouble speaking, or worsening symptoms.

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