Safety Considerations
Feverfew has some cautionary measures but is otherwise safe for consumption by most people. It is recommended to take Feverfew in cycles of 5 days on and 2 days off or 3 weeks on and 1 week off. Eating fresh Feverfew leaves can cause mouth soreness or mouth ulcers (Easley & Horne, 2016) (Gladstar, 2014) (Chevallier, 2016) (Hoffmann, 2003).
Contraindications
Based on empirical evidence, early pregnancy may be induced due to the emmenagogue effect of Feverfew. Consumption of Feverfew while pregnant is only advised under the supervision of a qualified healthcare practitioner (Brinker, 1998) (Gardner & McGuffin, 2013).
Drug Interactions
No drug interactions have been documented but it is recommended to avoid Feverfew if you are taking warfarin, aspirin or other blood-thinning medication (Chevallier, 2016) (Hoffmann, 2003).
Adverse Events
Feverfew may cause allergic reactions in people in rare cases. This is most often the case for people allergic to other members of the Asteraceae family, e.g., chamomile (Chevallier, 2016) (Hoffmann, 2003) (Gardner & McGuffin, 2013).
Discontinuation of Feverfew should be done gradually, over approximately 1 month, to avoid symptoms of aches and pains, joint and muscle stiffness and poor sleep (Gardner & McGuffin, 2013).