Alverine Citrate is a smooth muscle relaxant. Smooth muscle is a type of muscle that is not under voluntary control; it is the muscle present in places such as the gut and uterus. Alverine Citrate acts directly on the muscle in the gut, causing it to relax. This prevents the muscle spasm which occur in the gut in conditions such as irritable bowel syndrome and diverticular disease. Alverine Citrate also relaxes the smooth muscle in the uterus. It is therefore also used to treat painful menstruation, which is caused by muscle spasm in the uterus (dysmenorrhea).