Most side effects caused by feverfew are mild. It may cause mouth and tongue sores, trouble sleeping, nervousness, or tiredness. Check with your doctor. Feverfew should not be used if you are pregnant or breast-feeding. Do not give feverfew to children less than 2 years old.
Some natural remedies have the same effects as prescription medicines.
This means there is a danger of being overmedicated. If you have any unusual effects while taking any natural remedy, get advice from a doctor right away. Natural remedies and prescription medicines may interact. Lack of standardization may result in products with different strengths and effects. Lack of quality control may allow contamination of products.