Botox is not considered safe during pregnancy. The FDA label states it “may cause fetal harm” based on animal studies, and the American College of Obstetricians and Gynecologists recommends avoiding it entirely during pregnancy. No controlled human studies have been conducted, so the exact level of risk remains unknown, but the consistent medical guidance is to skip Botox until after pregnancy and breastfeeding.
What the FDA Label Says
The FDA prescribing information for Botox, last revised in 2021, includes a clear warning under pregnancy: “Based on animal data, may cause fetal harm.” There are no human studies and no systematic data from postmarketing surveillance on developmental risks in pregnant women.
In animal studies, pregnant mice, rats, and rabbits given Botox during the window when organs form showed reduced fetal body weight and delayed bone development at higher doses. In rats and rabbits that received daily injections during this period, the two highest dose groups also experienced abortions, early deliveries, and maternal deaths. However, when pregnant rats received a single injection (closer to how Botox is actually used in humans), no adverse fetal effects were observed, even at doses roughly twice the maximum human dose adjusted for body weight.
This distinction matters. Cosmetic Botox involves a one-time injection of relatively small amounts, not the repeated daily dosing used in the animal studies that showed harm. Still, the lack of human safety data means no one can confidently say a single cosmetic dose poses zero risk.
Why Botox Probably Stays Local
Botox is a large protein with a molecular weight of about 150,000 daltons. Most molecules that cross the placenta passively are much smaller. A case report published in the New England Journal of Medicine involving a pregnant woman with actual botulism (far more toxin exposure than a cosmetic injection) found no evidence that the toxin crossed the placental barrier or harmed the fetus.
There’s another reassuring detail: after a standard cosmetic injection, Botox cannot be detected in the bloodstream using current technology. If the toxin isn’t circulating in your blood, it has no obvious route to reach the placenta. That said, the absence of detectable levels doesn’t prove zero systemic absorption, and researchers have not ruled out the possibility of an active transport mechanism that could move the toxin across the placenta.
What Human Exposure Data Shows
While no clinical trial has intentionally given Botox to pregnant women, a 29-year safety review published in the journal Neurology tracked outcomes from women who were exposed to Botox around the time of conception or during early pregnancy. Of 195 prospectively tracked pregnancies (197 fetuses including twins), 152 resulted in live births. Of those, 148 were normal and 4 had abnormal outcomes, a birth defect rate of 2.6%. Among first-trimester exposures with known timing, 2 out of 98 resulted in fetal defects, a rate of 2.0%.
For context, the baseline rate of major birth defects in the general U.S. population is 2 to 4%, and the background miscarriage rate is 15 to 20%. The defect rates seen in Botox-exposed pregnancies fall within that normal range. The defects reported (a heart murmur, a clubfoot, a small heart wall defect that resolved without treatment) did not cluster into a recognizable pattern that would suggest Botox was the cause.
A separate real-world study from a headache center in Hull, England, tracked 126 women who became pregnant while receiving Botox for chronic migraines between 2010 and 2024. Of those, 97 chose to continue treatment. The miscarriage rate among women who continued Botox was 2.1%, compared to 3.4% in those who stopped. No fetal malformations were reported in either group. The women who continued treatment all maintained migraine remission, while only 31% of those who stopped remained in remission.
Cosmetic vs. Medical Botox
There is a meaningful difference between getting Botox for forehead lines and getting it for a debilitating condition like chronic migraine. Cosmetic doses are typically 20 to 40 units focused on a small area of the face. Medical doses for chronic migraine involve around 155 units injected across 31 sites in the head and neck. The risk-benefit calculation is different in each situation.
For cosmetic use, the benefit is purely aesthetic, which makes even a theoretical risk to the fetus hard to justify. Most dermatologists and obstetricians will decline to administer cosmetic Botox to pregnant patients. For chronic migraines, where pregnancy can worsen symptoms and treatment options are limited, some specialists may discuss continuing Botox with their patients on a case-by-case basis. ACOG’s position, however, is that Botox should be avoided during pregnancy regardless of indication.
If You Got Botox Before Knowing You Were Pregnant
This is probably the most common real-world scenario, and it’s worth addressing directly. Many women receive Botox in early pregnancy before a positive test. The available evidence is reassuring. The 29-year safety review found that first-trimester exposure produced birth defect rates no higher than the general population’s baseline. The toxin doesn’t appear to enter systemic circulation at detectable levels after a cosmetic injection, and its large molecular size makes passive placental transfer unlikely.
None of this guarantees safety, but it does suggest that an accidental early exposure is not a reason to panic. Let your OB know about the timing so they can monitor appropriately, but the data so far has not revealed a clear signal of harm from incidental exposure.
Skin Care Alternatives During Pregnancy
If you’re used to regular Botox and want to maintain your skin during pregnancy, topical options can help bridge the gap. Vitamin C serums encourage collagen production, which keeps skin firmer and reduces fine lines over time. They also boost the effectiveness of sunscreen, which is especially useful since pregnancy hormones can increase sun sensitivity and pigmentation changes.
Hydrating moisturizers with hyaluronic acid are also pregnancy-safe and can temporarily plump fine lines by drawing water into the skin. These won’t replicate the muscle-relaxing effect of Botox, but they can keep your skin in good condition until you’re ready to resume injections.
Resuming Botox After Delivery
The question of when to restart Botox after pregnancy depends partly on whether you plan to breastfeed. A small pilot study analyzed breast milk samples from four lactating women who received facial Botox injections. Half of the 16 samples showed no detectable toxin at all. The other half contained amounts well below the reported lethal oral dose for an infant, and botulinum toxin is a protein that would likely be broken down in the infant’s digestive tract before absorption.
This is limited data from a very small study, so most providers still advise caution. Some will recommend waiting until you’ve finished breastfeeding entirely. Others may be comfortable with resuming Botox during lactation given the low levels detected and the theoretical safety margin. This is a conversation to have with your provider based on your comfort level and how important treatment is for your quality of life.