Hydroxyzine is contraindicated in early pregnancy according to its FDA-approved labeling. The drug caused fetal abnormalities in animal studies at high doses, and there isn’t enough human data to confirm it’s safe during the first trimester. That said, hydroxyzine is still sometimes prescribed later in pregnancy when the benefits are judged to outweigh the risks, particularly for anxiety or severe itching. This is a decision that depends heavily on your individual situation, what you’re taking it for, and what trimester you’re in.
What the FDA Label Says
The official prescribing information for hydroxyzine (sold as Vistaril and formerly Atarax) states plainly that it is “contraindicated in early pregnancy.” Animal studies in mice, rats, and rabbits found fetal abnormalities when the drug was given at doses well above the normal human range. Because human studies haven’t been sufficient to rule out similar risks, the manufacturer advises against use in early pregnancy entirely.
This doesn’t necessarily mean a single dose will cause harm. It means the safety margin hasn’t been established, and caution leans toward avoidance, especially in the first trimester when organs are forming.
What Human Studies Show About Birth Defects
A large CDC-backed study looked at antihistamine use during early pregnancy and the risk of specific birth defects. Overall, very few pregnancies in the study involved hydroxyzine exposure, about 0.1% of both the group with birth defects and the control group. That low exposure rate makes it difficult to draw firm conclusions.
Researchers did observe slightly elevated odds for certain defects, including some heart wall abnormalities and limb deficiencies, but none of these findings reached statistical significance. In practical terms, this means the data didn’t prove a clear link between hydroxyzine and any specific malformation. It also didn’t prove it was safe. The honest answer is that the human evidence is too thin to say either way with confidence, which is part of why the label errs on the side of caution.
Risks in Late Pregnancy
Using hydroxyzine in the final weeks before delivery carries a different concern: temporary symptoms in the newborn. Two documented cases involved babies whose mothers took hydroxyzine in the four weeks before giving birth. One newborn had a seizure, while the other showed jitteriness, jerking movements, and trouble feeding. These symptoms are sometimes described as withdrawal, and they resolved on their own.
Not every baby exposed late in pregnancy will experience these effects. But the possibility means that if you’re using hydroxyzine regularly, your provider may want to taper or stop it as your due date approaches.
Why Some Providers Still Prescribe It
Despite the label warning, hydroxyzine is used fairly often during pregnancy to manage anxiety and sleep problems. The MGH Center for Women’s Mental Health notes it has become a common alternative to benzodiazepines because it doesn’t carry the same risk of dependence or misuse. For some people, untreated anxiety during pregnancy poses its own risks, including poor sleep, elevated stress hormones, and difficulty maintaining prenatal care.
The prescribing decision typically comes down to weighing the uncertain risk of the medication against the known consequences of leaving a condition untreated. For anxiety specifically, providers often prefer to start with or optimize an antidepressant first, reserving hydroxyzine or other options for situations where more help is needed.
Safer Alternatives by Use
The best alternative depends on why you’re taking hydroxyzine in the first place.
- For allergies: Loratadine (Claritin) and cetirizine (Zyrtec) are generally considered first-line antihistamines during pregnancy. Both are available over the counter and have more reassuring safety data.
- For anxiety: Certain antidepressants have a longer track record in pregnancy and are typically preferred as a foundation for anxiety treatment. For short-term relief, some providers use low-dose benzodiazepines selectively, weighing the risks carefully.
- For itching or hives: The same over-the-counter antihistamines used for allergies can help. For pregnancy-specific itching conditions like cholestasis, your provider will want to investigate the cause rather than just treat the symptom.
If You’ve Already Taken It
If you took hydroxyzine before realizing you were pregnant, or before learning about the labeling concerns, the actual risk to any individual pregnancy appears to be quite small based on available data. The CDC study showed no statistically significant increase in birth defect rates among exposed pregnancies. A single dose or short course is different from ongoing daily use throughout the first trimester. Bring it up with your provider so they can note the exposure and adjust your plan going forward, but this is not a situation that calls for panic.