Feverfew

Feverfew, a member of the sunflower family, has been used over time as a remedy for headaches, arthritis, and fevers. Feverfew is native to the Balkan mountains of Eastern Europe but now grows throughout Europe, North America, and Australia. Feverfew has green-yellow leaves that grow on both sides of the stem at alternating levels. The small, daisy-like yellow flowers bloom between July and October. The plant has a bitter odor.



Other Names
Common Names--feverfew, bachelor's buttons, featherfew

Latin Names--Tanacetum parthenium, Chrysanthemum parthenium

Traditional
Feverfew has been used for centuries in European folk medicine as a remedy for headaches, arthritis, and fevers.

Other traditional uses include:
 * Menstrual irregularities
 * Labor difficulties
 * Skin conditions
 * Stomach aches
 * Asthma.

Modern-day
Modern-day uses for feverfew include:
 * Migraine headaches
 * Arthritis, both osteoarthritis and rheumatoid arthritis
 * Psoriasis
 * Asthma
 * Allergies
 * Tinnitis (ringing in the ears)
 * Dizziness
 * Nausea
 * Vomiting

How Is Taken
Dosage recommendations (per the University of Maryland Medical Center)

Pediatric
Feverfew should not be used in children under two years of age.

In older children, adjust the recommended adult dose to account for the child's weight. Most herbal dosages for adults are calculated on the basis of an average of 150 lb (70 kg) adult. Therefore, if the child weighs 50 lb (20 - 25 kg), the appropriate dose of feverfew for this child would be 1/3 of the adult dosage.

Adult
For migraine headaches: Take 100 - 300 mg, up to four times daily, standardized to contain 0.2 - 0.4% parthenolides. Feverfew may be used to prevent or to stop a migraine headache. Feverfew supplements may also be carbon dioxide extracted. For these, take 6.25 mg, 3 times daily, for up to 16 weeks.

For inflammatory conditions (such as arthritis): 120 - 60 drops, 2 times daily of a 1:1 w/v fluid extract, or 60 - 120 drops twice a day of 1:5 w/v tincture.

How It Works
The active ingredient in feverfew is believed to be parthenolide. Parthenolide apprears to have several important actions:
 * Preventing constriction of smooth muscle in the brain (migrane prevention)
 * Posesses anti-inflammatory properties (treatment of arthritis)
 * Inhibition of tumor growth (may include breast cancer, cervical cancer , and prostate cancer.
 * Inhibition of platelet aggregation

Side effects
No serious side effects have been reported for feverfew. Side effects can include:
 * Canker sores
 * Swelling and irritation of the lips and tongue
 * Loss of taste
 * Nausea
 * Digestive problems
 * Bloating

People who take feverfew for a long time and then stop taking it may have:
 * Headaches
 * Nervousness
 * Difficulty sleeping
 * Stiff muscles
 * Joint pain

Complications
Women who are pregnant should not use feverfew because it may cause the uterus to contract, which increases the risk of miscarriage or premature delivery.

People can have allergic reactions to feverfew. Those who are allergic to other members of the daisy family (which includes ragweed and chrysanthemums) are more likely to be allergic to feverfew.

Feverfew may increase the tendency to bleed, especially in individuals with bleeding disorders or taking blood-thinning medications, such as aspirin or warfarin.

Interactions
Feverfew may inhibit the activity of platelets (a substance that plays a role in blood clotting), so individuals taking blood-thinning medications (such as aspirin and warfarin) should consult a health care provider before taking this herb.

As with any medication, patients should discuss the use of feverfew with their health care provider, especially if they are being treated for other health conditions.

Recent news

 * Feverfew's active ingredient, parthenolide, appears to be have anti-protozoal activity against Trypanosoma cruzi.
 * Parthenolide also shows promise as a potential treatment for leukemia.

Clinical Trials
No ongoing clinical trials regarding feverfew are available at this time.

Etymology
The term feverfew is adapted from the Latin word febrifugia or "fever reducer."

Other Resources
Awang DVC, Leung AY. Feverfew (Tanacetum parthenium). In: Coates P, Blackman M, Cragg G, et al., eds. Encyclopedia of Dietary Supplements. New York, NY: Marcel Dekker; 2005:211-217.