Is Doxylamine Succinate Safe in Pregnancy

Status

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

Reason

Pregnancy use is used for nausea/vomiting, but it can cause drowsiness and needs provider guidance; review before use or stopping.

Drug Information

Brand Name
Unisom SleepTabs; Bonjesta; Diclegis
Generic Name
doxylamine succinate
Drug Class
First-generation antihistamine
FDA Category
N/A
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; official labeling and provider guidance matter for dose and timing.
Mother
Can cause sleepiness, dizziness, dry mouth, and next-day impairment.
Baby
FDA labeling for doxylamine-pyridoxine has not shown a clear fetal risk in available data, but individual risk still needs provider review.

Trimester Notes

1st Trimester
Often used in early pregnancy for nausea and vomiting when recommended by a clinician.
2nd Trimester
May be used if needed, but dosing and timing should be guided by your clinician.
3rd Trimester
Can still cause sedation in the mother; use only if your prescriber recommends it.

Conditions & Warnings

  • Consult OB/GYN or prescriber
  • May cause drowsiness; do not drive if sleepy
  • OTC pregnancy dosing limits may apply
  • Avoid alcohol and other sedating medicines unless your prescriber says it is okay

Alternatives

  • Vitamin B6 (pyridoxine) if your clinician recommends it
  • Non-medicine measures such as small frequent meals and avoiding triggers
  • Other anti-nausea medicines only if prescribed by your clinician

References

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