Hyoscine-n-butylbromide is an antispasmodic drug used to treat conditions associated with spasms of the gastrointestinal tract, such as cramping.sshow does it work?sthis medication relieves gastrointestinal cramping by relieving smooth muscle contractions.ssdrug interactionsssanticholinergic drugsssincreased anticholinergic effects (dry mouth, urinary retention, constipation, confusion in the elderly)sssedative drugsssincreased sedative effectsssdisease interactionsssconsult 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.ssrecommended dosagessadults: 10-20 mg 3-4 times daily with a maximum daily dose of 100 mg.sschildren: 1-3 months: 1.5 mg 3 times a dayss3-12 months: 2.5-5 mg 3 times a dayss1-3 years: 5-10 mg 3 times a dayss3-6 years: 10 mg 3 times a dayss6-12 years: 10-20 mg 3 times a days