Benadryl Safe in Pregnancy

Status

caution Last reviewed: 2026-05-16 · Confidence: moderate

Reason

Limited pregnancy data. Use only if needed and as directed by your provider.

Drug Information

Brand Name
Benadryl
Generic Name
diphenhydramine
Drug Class
First-generation antihistamine
FDA Category
B
Rx Status
OTC

Safe Amount

Dosage must be determined by your provider based on individual risk/benefit.

Effects

Pregnancy
Occasional use at recommended doses is not expected to increase pregnancy problems, but trimester-specific data are limited.
Mother
Can cause drowsiness, dry mouth, constipation, and dizziness.
Baby
May cross the placenta. Most data do not show a clear increase in birth defects, but evidence is limited.

Trimester Notes

1st Trimester
Limited data. No consistent pattern of birth defects has been found, but evidence is not complete.
2nd Trimester
Occasional use at recommended doses is generally considered acceptable when needed, based on limited official guidance.
3rd Trimester
Use only if your prescriber says it is needed. Newborn sedation is a possible concern near delivery.

Conditions & Warnings

  • Consult OB/GYN or prescriber
  • OTC pregnancy dosing limits may apply

Alternatives

  • Cetirizine
  • Loratadine
  • Non-medicine allergy measures such as saline nasal spray

References

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