Is Doxylamine Safe in Pregnancy

Status

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

Reason

Pregnancy use has official dosing guidance for nausea and vomiting, but it can cause drowsiness and should be reviewed by your OB/GYN or prescriber.

Drug Information

Brand Name
Unisom SleepTabs
Generic Name
doxylamine
Drug Class
First-generation antihistamine
FDA Category
N/A (PLLR narrative label)
Rx Status
OTC

Safe Amount

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

Effects

Pregnancy
Used for nausea and vomiting of pregnancy in the doxylamine/pyridoxine product; dosing and product choice should be guided by a provider.
Mother
May cause drowsiness, dizziness, dry mouth, and next-day sedation. Use can worsen impairment.
Baby
No known fetal harm is noted in official labeling for the pregnancy-approved doxylamine/pyridoxine product when used as directed.

Trimester Notes

1st Trimester
Often used early in pregnancy for nausea and vomiting when recommended by a provider.
2nd Trimester
Can be continued if your provider recommends it and side effects are tolerated.
3rd Trimester
May cause more sedation in the mother; use only if your provider says it is appropriate.

Risk-Benefit Note

If used for nausea and vomiting of pregnancy, the benefit may outweigh the risk when taken as directed. Do not stop or start it without your prescriber’s advice.

Conditions & Warnings

  • Consult OB/GYN or prescriber
  • OTC pregnancy dosing limits may apply
  • Avoid driving or alcohol if drowsy
  • Do not combine with other sedating medicines without medical advice

Alternatives

  • Vitamin B6 (pyridoxine) as directed by a clinician
  • Lifestyle steps for nausea: small meals, fluids, ginger if approved by your clinician
  • Provider-prescribed doxylamine/pyridoxine product if appropriate

References

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