Defopan is grape-anise flavored Hyoscine – N – butylbromide syrup. Hyoscine – N – butylbromide is antispasmodic with anti-muscarinic activity Defopan is used to relieve cramps in the muscles of your: • Stomach • Gut (intestine) • Bladder and the tubes that lead to the outside of your body (urinary system). It can also be used to relieve the symptoms of Irritable Bowel Syndrome (IBS).