In today’s herbal medicine, water pepper is mainly used as a topical astringent agent and a remedy against diarrhea.
The tannins, bitter substances, essential oil, glycosides, organic acids and vitamin C (only present in the fresh plant) are considered to be the most important medicinal substances in water pepper.
These substances give the herb its astringent, styptic, diuretic and anti-inflammatory properties. The leaves also contain the substance rutin, which is thought to strengthen fragile capillaries and thereby prevent bleeding.
Water pepper can also be used internally as a tea against heavy menstrual bleeding, bleeding after childbirth, vaginal bleeding between periods and minor bleeding in the digestive tract caused by hemorrhoids.
In addition, the herb (in tea form) is sometimes used by herbalists as a digestive tonic and a remedy for diseases and ailments of the digestive system such as dyspepsia, diarrhea, dysentery, colic and intestinal worms.