Feverfew is not considered safe during pregnancy. The National Institutes of Health explicitly advises against taking feverfew while pregnant because it can affect uterine contractions. This warning is consistent across medical references, herbal safety databases, and the supplement’s own manufacturers.
Why Feverfew Poses a Risk
Feverfew contains compounds called sesquiterpene lactones, the most active being parthenolide. These compounds can stimulate the uterus, increasing the frequency or intensity of contractions. In pharmacology, substances that promote uterine contractions and menstrual flow are called emmenagogues, and feverfew has a well-documented history of being used as one. In traditional medicine, the plant was actually used as an abortifacient, a substance intended to end a pregnancy.
A systematic review published in Pharmacognosy Reviews confirmed that feverfew leaves possess emmenagogue activity, and that the plant’s uterine stimulant effect aligns with its historical folk use for inducing menstruation and labor. The concern is straightforward: a substance that stimulates the uterus could trigger premature contractions, potentially leading to miscarriage or preterm labor.
What Animal Studies Show
No human clinical trials have tested feverfew in pregnant women, for obvious ethical reasons. The limited data comes from animal research. In one study using rats, females were given oral doses of feverfew during either early or mid-gestation. Fetuses exposed during mid-gestation (days 8 through 15) were smaller than those in the control group, possibly due to a higher number of runts in treated litters. There was also an apparent increase in pre-implantation loss in the early-gestation group, though this finding did not reach statistical significance.
When rat embryos were cultured directly in serum containing feverfew extract, the herb showed clear toxic effects. The researchers concluded that a comprehensive reproductive safety study of feverfew is warranted, a study that, to date, has not been conducted. The absence of thorough safety data is itself a reason to avoid the supplement during pregnancy.
Safety During Breastfeeding
The picture isn’t much better for nursing mothers. According to the LactMed database maintained by the National Institutes of Health, no data exist on whether any components of feverfew pass into breast milk. There is no information on its safety or effects in breastfed infants. Because of this complete lack of data, many reviewers recommend against using feverfew while breastfeeding.
Feverfew can cause oral ulcers, gastrointestinal irritation, and allergic reactions in adults, particularly in people sensitive to plants in the daisy family (chrysanthemums, marigolds). Stopping feverfew abruptly can also cause rebound headaches. Whether any of these effects could impact a nursing infant is simply unknown.
Migraine Alternatives During Pregnancy
Most people searching for feverfew and pregnancy are likely taking it for migraines, which is its primary use. The good news is that migraines often improve during pregnancy, particularly in the second and third trimesters, due to hormonal changes. When they don’t, several safer options exist.
Lifestyle strategies form the foundation: avoiding known triggers, managing stress, maintaining regular sleep, staying hydrated, eating regular meals, and getting consistent exercise. These measures alone reduce migraine frequency for many pregnant women.
For acute migraine attacks, acetaminophen (paracetamol) is the recommended first-line treatment during pregnancy. If preventive medication is needed, propranolol (a beta-blocker) and amitriptyline (a low-dose antidepressant) are options that can be started at the lowest effective dose under medical supervision.
Two non-drug options are also worth knowing about. Greater occipital nerve blocks, an injection at the base of the skull, have been shown to provide longer-term headache relief during pregnancy and can reduce the need for daily medication. Supraorbital nerve stimulation, a type of wearable neuromodulation device, is also considered safe in pregnancy and can help some women manage attacks without any medication at all.
If You’ve Already Taken It
If you took feverfew before realizing you were pregnant, or early in pregnancy before learning about the risk, a single dose or short exposure is unlikely to cause harm. The concern is primarily with ongoing, regular use. That said, it’s worth mentioning to your prenatal care provider so they can note it in your history and address any questions you have about your specific situation.