Action: taenifuge, vermifuge, deobstruent.
Uses: tapeworms (Traditional). Treatment is taken fasting under medical supervision. Dr C. Hering advised an ounce of the grated root, gathered fresh, to be taken in the morning, the tapeworm usually making a speedy exit by the afternoon. Present-day dosage is much less: quarter to half an ounce taken over a longer period and mixed with a demulcent (i.e. Slippery Elm).
Dioscorides was aware of its power to induce abortion and infertility. Reported use by Chinese for tumours.
Preparations: Extract Filicis, BP. Dose: 3-6ml.
Powder: dose, 1-10 grams. Male Fern capsules BP (1958). Note: Today seldom used. Of historical interest.