Mebeverine helps to relax the muscles of the gastrointestinal tract (gut). It is used in conditions such as irritable bowel syndrome and similar problems such as chronic irritable colon, spastic constipation, mucous colitis, and spastic colitis. This belongs to a group of medicines called antispasmodics. The intestine is a long muscular tube that food passes down so it can be digested. If the intestine goes into spasm and squeezes too tightly, you get pain. The way this medicine works is by relieving the spasm, pain, and other symptoms of IBS.