Combined drug, has astringent, antacid, spasmolytic and mild laxative effect. Magnesium hydroxycarbonate and sodium hydrogen carbonate reduce the acidity of gastric juice, reduce the activity of pepsin.Bismuth subnitrate forms a protective film on the mucous membrane of the stomach, providing an anti-inflammatory, bactericidal, reparative effect. Included in the composition of ayr and kellin have spasmolytic effect, buckthorn bark - laxative.