Tansy is not widely used in modern herbalism. The leaves and flower tops of this herb are mainly used as a vermifuge to expel intestinal worms. Less commonly, tansy is used to treat menstrual irregularities and induce menstrual bleeding. There is not enough scientific evidence about the safety and efficacy of tansy to support its traditional uses.
Aside from medicinal uses, distilled tansy oil repels mosquitoes, though not as well as commercial preparations containing diethytoluamide.
Asteraceae (family), bachelor's buttons, beta-thujone, bitter button, boerenwormkruid, buttons, Chrysanthemum uliginosum, Chrysanthemum vulgare, common tansy, Compositae (family), cow bitter, daisy, garden tansy, ginger plant, gold-buttons, golden button, hindheal, mugwort, parsley fern, ponso, prince of Wales feathers, Pyrethrum tanacetum, scented fern, sesquiterpene lactones, solucanotu, stinking Willie, tanaceto, Tanacetum audiberti, Tanacetum vulgare, tanse-tansy, tansey, yomogi-giku.
These uses have been tested in humans or animals. Safety and effectiveness have not always been proven. Some of these conditions are potentially serious, and should be evaluated by a qualified healthcare provider.