Safe & Effective Migraine Treatment How do I take feverfew? Take 40 drops of Swiss Herbal Remedies feverfew tincture in a little cold water first thing in the morning. Cautions & contra-indications Feverfew is a safe herb & does not interact with any other drugs. It is safe for use in pregnancy & can be used by children. There are some reports that users of feverfew have experienced mouth ulcers with continued use. This effect though is usually experienced by people who have been chewing the leaves. Some individuals may be allergic to feverfew. Tincture specifications. Our feverfew tincture is an organic infused 14 25% alcohol