Hyoscine-n-butylbromide is an antispasmodic drug used to treat conditions associated with spasms of the gastrointestinal tract, such as cramping.how does it work?this medication relieves gastrointestinal cramping by relieving smooth muscle contractions.drug interactionsanticholinergic drugsincreased anticholinergic effects (dry mouth, urinary retention, constipation, confusion in the elderly)sedative drugsincreased sedative effectsdisease interactionsconsult your doctor before using this drug if you have glaucoma, obstructive bowel disorder, an enlarged prostate, liver or kidney disease, myasthenia gravis, or if you have heart disease.recommended dosageadults: 10-20 mg 3-4 times daily with a maximum daily dose of 100 mg.children: 1-3 months: 1.5 mg 3 times a day3-12 months: 2.5-5 mg 3 times a day1-3 years: 5-10 mg 3 times a day3-6 years: 10 mg 3 times a day6-12 years: 10-20 mg 3 times a day