A client who experiences migraine headaches reports having fewer headaches since using the herbal remedy feverfew. Which information is most important for the nurse to include in a teaching plan for this client?

Increased anxiety and nervousness have been reported by those taking feverfew.

Feverfew may interact with aspirin or non-steroidal anti-inflammatory drugs.

Those with allergies to chamomile, ragweed, or yarrow should not take feverfew.

Abdominal pain, gas, nausea, vomiting, and diarrhea can occur when taking feverfew.