Gastro Stop 2mg 20CapGastro Stop provides relief from acute and chronic diarrhoea. It provides effective relief within one to three hours after the first dose. Gastro Stops active ingredient, loperamide, works locally on the digestive system by slowing down the movement of the intestines. In doing so, the intestines have more time to absorb water and electrolytes which helps to relieve the symptoms of diarrhoea.