Can I take fexofenadine while pregnant or breastfeeding?
A plain-words look at what the NHS, the US drug label and LactMed say about fexofenadine.
In short
Pregnancy: Fexofenadine is not usually recommended if you're pregnant, because there is not much information about its use in pregnancy.
Breastfeeding: You can take fexofenadine while breastfeeding if you need to, although other antihistamines might be better. Your doctor or pharmacist can help you make the decision, so speak to them first.
Your doctor, midwife or pharmacist can help you decide.
What this means for you
Pregnancy
- Other antihistamines may be more suitable, as there is better safety information about them.
- If you think you need fexofenadine while pregnant, speak to your doctor or pharmacist.
- They will help you decide, or may suggest other medicines.
Breastfeeding
- You can take fexofenadine while breastfeeding if you need to, although other antihistamines might be better.
- Your doctor or pharmacist can help you make the decision, so speak to them first.
- There is very little information about fexofenadine and breastfeeding, but what there is shows that only tiny amounts get into breast milk.
- Side effects in breastfed babies from medicines their mother takes are very rare.
- Even so, it's important to keep an eye on your baby while you take any medicine and breastfeed.
- Until you've had advice about your baby's symptoms, keep taking fexofenadine and carry on breastfeeding as normal.
When to get help
- Contact a healthcare professional or call 111 (in the UK) as soon as you can if your baby is not feeding as well as they usually do, or seems unusually sleepy or irritable.
- If your baby has any other symptoms, or you're worried about them, you can still call 111 or get in touch with any healthcare professional.
Talk to your doctor or pharmacist
This page is educational, not advice for your own situation. Talk to your doctor, midwife or pharmacist before you start, stop or change any medicine in pregnancy or while breastfeeding.
The details: what each source says
Fexofenadine in pregnancy
The NHS says
Fexofenadine is not usually recommended if you're pregnant, because there is not much information about its use in pregnancy.
Other antihistamines may be more suitable, as there is better safety information about them.
If you think you need fexofenadine while pregnant, speak to your doctor or pharmacist. They will help you decide, or may suggest other medicines.
In our words, from the NHS page Fexofenadine (nhs.uk). Contains public sector information licensed under the Open Government Licence v3.0 (OGL v3.0). The NHS does not endorse this site.
The US Drug Facts label says
If pregnant or breast-feeding, ask a health professional before use.
Drug Facts label: ALLERGY (oral), Amazon.com Services LLC. Label on DailyMed. Quoted verbatim; US labels are written for US prescribers and patients.
Fexofenadine while breastfeeding
The NHS says
You can take fexofenadine while breastfeeding if you need to, although other antihistamines might be better. Your doctor or pharmacist can help you make the decision, so speak to them first.
There is very little information about fexofenadine and breastfeeding, but what there is shows that only tiny amounts get into breast milk.
Side effects in breastfed babies from medicines their mother takes are very rare. Even so, it's important to keep an eye on your baby while you take any medicine and breastfeed.
Contact a healthcare professional or call 111 (in the UK) as soon as you can if your baby is not feeding as well as they usually do, or seems unusually sleepy or irritable.
If your baby has any other symptoms, or you're worried about them, you can still call 111 or get in touch with any healthcare professional.
Until you've had advice about your baby's symptoms, keep taking fexofenadine and carry on breastfeeding as normal.
In our words, from the NHS page Fexofenadine (nhs.uk). Contains public sector information licensed under the Open Government Licence v3.0 (OGL v3.0). The NHS does not endorse this site.
LactMed says
Because of its lack of sedation and low milk levels, maternal use of fexofenadine would not be expected to cause any adverse effects in breastfed infants. Fexofenadine might have a negative effect on lactation, especially in combination with a sympathomimetic agent such as pseudoephedrine.
“Summary of Use during Lactation”, LactMed record “Fexofenadine” (LM111), quoted verbatim. Everything LactMed reports about Fexofenadine while breastfeeding.
Other names
UK brand names (per the NHS): Allevia, Almerg, Histallay, Telfast, Treathay.
Indian brands (per NPPA): Allegra.
Sources
- NHS, Fexofenadine (nhs.uk), page last reviewed 22 April 2025. Paraphrased. Contains public sector information licensed under the Open Government Licence v3.0.
- US drug label: ALLERGY (oral), Amazon.com Services LLC, human otc drug, label effective 9 September 2026, set ID 1b5aa481-205d-4935-ae58-fcb8cbc35c4c. DailyMed (National Library of Medicine). Public domain; quoted verbatim.
- Drugs and Lactation Database (LactMed), National Institute of Child Health and Human Development (NICHD), via NCBI Bookshelf, record “Fexofenadine” (LM111), bulk release of 22 September 2026. LactMed on NCBI Bookshelf. Public domain; quoted verbatim. LactMed is a registered trademark of the U.S. Department of Health and Human Services.
Sources checked 26 September 2026. How we source and check every page.
Educational summary of named sources, not medical advice.