"Yellow toadflax has a long history of herbal use. It acts mainly on the liver and was once widely employed as a diuretic in the treatment of oedema. It is little used now, but undoubtedly merits investigation. The whole plant is antiphlogistic, astringent, cathartic, detergent, depurative, diuretic, hepatic, ophthalmic and purgative[4, 7, 9, 21]. It is gathered when just coming into flower and can be used fresh or dried[4, 238]. The plant is especially valued for its strongly laxative and diuretic activities. It is employed internally in the treatment of oedema, jaundice, liver diseases, gall bladder complaints and skin problems[4, 222, 238]. Externally it is applied to haemorrhoids, skin eruptions, sores and malignant ulcers. The plant should be used with caution. It should preferably only be prescribed by a qualified practitioner and should not be given to pregnant women. Dosage is critical, the plant might be slightly toxic[21, 238]. The fresh plant, or an ointment made from the flowers, is applied to piles, skin eruptions etc[4, 222]. The juice of the plant, or the distilled water, is a good remedy for inflamed eyes and cleaning ulcerous sores. A homeopathic remedy is made from the plant. It is used in the treatment of diarrhoea and cystitis"
- PFAF References