A client who has been experiencing headaches since using the herbal remedy feverfew. Which information is important to include for this client?

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

Feverfew may interact with aspirin or nonsteroidal anti-inflammatory drugs (NSAIDs).

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

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