The safe and effective dose of feverfew has not yet been established, especially since different products (and even different plants) vary considerably in the content of the active medicinal chemicals.
(Click Feverfew Dosage for more information.)
Many people believe that "natural" products, such as feverfew, have no side effects. However, many natural products can cause side effects, some of which can be quite serious. Feverfew can cause side effects such as:
- Heartburn or indigestion
- Diarrhea or constipation
- Abdominal (stomach) bloating and pain
- Canker sores
- Irritation of the mouth, lips, or tongue.
(Click Feverfew Side Effects to learn more, including potentially serious side effects you should report immediately to your healthcare provider.)
Feverfew may interact with a few other medications or supplements (see Feverfew Drug Interactions).
Feverfew is probably safe for many people at reasonable doses for short periods. Some people may be more likely to experience problems, however. Therefore, you should talk with your healthcare provider before taking this herb if you:
- Are pregnant or thinking of becoming pregnant (see Feverfew and Pregnancy)
- Are breastfeeding (see Feverfew and Breastfeeding)
- Have any allergies, including allergies to food, dyes, or preservatives.
Make sure to tell your healthcare provider about all other medicines you are taking, including prescription and non-prescription medicines, vitamins, and herbal supplements.
(Click Feverfew Safety for more information, including any available warnings and precautions.)