Feverfew can cause allergic reactions, especially in persons who are allergic to ragweed, chrysanthemums, marigolds, or yarrow.
Feverfew may alter the effects of some medications and should be avoided in patients taking medications to prevent blood clotting (anticoagulants) such as warfarin (Coumadin).
Muscle stiffness, anxiety, and moderate pain can occur following cessation of long-term feverfew use in a syndrome called "post-feverfew syndrome".
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Last Editorial Review: 6/9/2016