Hyoscine butyl bromide, also known as scopolamine butyl bromide, is a medication used for the treatment of various gastrointestinal and genitourinary conditions that involve smooth muscle spasms or cramps.Hyoscine butyl bromide belongs to the class of drugs called anticholinergics or antispasmodics. It works by blocking the action of acetylcholine, a neurotransmitter that plays a role in muscle contraction. By inhibiting acetylcholine, hyoscine butyl bromide helps to relax the smooth muscles in the gastrointestinal and genitourinary systems, relieving spasms and reducing associated symptoms.