One of the most frequent health problems, especially when traveling is “diarrhea,” which affects up to 80 percent of people who go to high-risk countries (Africa, Asia, and Central and South America) where the sanitary conditions of water purification, and food preparation and preservation, are not very safe. In many cases, it is limited to mild cases of diarrhea lasting two or three days, but it can make traveling difficult. In other cases, diarrhea is accompanied by fever, nausea, vomiting, and even dehydration. Diarrhea is mostly due to drinking polluted water and consuming food with toxins.
For its tannin content, agrimony is considered an astringent that can be used to treat diarrhea. To stop serious persistent diarrhea, drink an infusion of agrimony that you prepare by mixing a teaspoon of the plant per cup of water. Boil it for two minutes, let it steep for fifteen minutes, and strain it. Drink three cups a day for three days to notice its effect.
Precisely because of its richness in tannins it is also effective for gargling as a treatment for pharyngitis or tonsillitis. Externally, it is an excellent remedy against dermatitis because it relieves intense itching.
Source: Medicinal Plants at Home