Once you take Buscopan IBS Relief, the tablets move to your digestive tract. There, the active ingredient, Hyoscine butylbromide, directly targets the smooth muscles of your abdomen with an antispasmodic effect. It interrupts the signal telling your gut muscles to cramp, relaxing contractions and relieving your IBS pain. Within 15 minutes, Buscopan IBS Relief begins to work in harmony with your stomach, so you can start feeling better.