Is Chlorpheniramine Safe in Pregnancy

Status

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

Reason

Official sources report no overall increased birth-defect risk, but pregnancy data are limited; use only with clinician guidance.

Drug Information

Brand Name
Chlor-Trimeton
Generic Name
chlorpheniramine
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
Not expected to increase miscarriage, preterm birth, or low birth weight based on available official reviews.
Mother
May cause drowsiness, dry mouth, dizziness, and other antihistamine side effects.
Baby
No overall increase in birth defects has been reported in official reviews; data are limited.

Trimester Notes

1st Trimester
Official reviews are reassuring for first-trimester exposure, but data are limited.
2nd Trimester
No specific second-trimester warning is listed in official reviews; clinician guidance is still advised.
3rd Trimester
No specific third-trimester harm is listed in official reviews, but use the lowest effective dose and ask a clinician.

Conditions & Warnings

  • Consult OB/GYN or prescriber
  • OTC: pregnancy dosing limits may apply
  • Use extra caution if you have glaucoma, urinary retention, or severe liver disease

Alternatives

  • Cetirizine
  • Loratadine
  • Non-medicine measures such as saline nasal spray or trigger avoidance

References

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