Feverfew is a medicinal plant that has been used for centuries to treat various conditions. Here are some of the uses of feverfew based on the search results:

• Migraine headaches: Feverfew is used mostly to treat and prevent migraines. Some research suggests that taking dried leaf capsules of feverfew every day may reduce the number of migraines in people who have chronic migraines. However, results have been mixed, and more research is needed to know if this is true.

• Fevers: Feverfew is promoted for fevers.

• Arthritis: Feverfew is promoted for arthritis. Some studies suggest that feverfew may reduce painful inflammation due to arthritis, but more research is needed to confirm this.

• Toothache: Topically (applied to the skin), feverfew is promoted for toothache.

• Antiseptic and insecticide: Topically (applied to the skin), feverfew is promoted as an antiseptic and insecticide.

Feverfew products usually contain dried feverfew leaves, but all parts of the plant that grow above ground may be used. Reported side effects from previous studies include mouth ulceration, indigestion and heartburn, colicky abdominal pain, dizziness, and rashes. No major safety problems have been identified in short-term use, but the long-term safety of feverfew is not known. People who are sensitive to ragweed and related plants may experience allergic reactions to feverfew. Pregnant women should not take feverfew because it may affect uterine contractions.