Ispaghula husk works by increasing the bulk of your stools, which encourages your bowels to move the stools through your digestive system, which in turn relieves constipation.nThis bulking action means that it can also be used to help treat diarrhoea and to help regulate the passage of food through the digestive system in people with certain long-term bowel disorders, such as irritable bowel syndrome, haemorrhoids, diverticular disease, ulcerative colitis and after some bowel surgery.nIspaghula husk may sometimes be used in a combination preparation with mebeverine. Mebeverine is an antispasmodic which is used to relieve spasms in the bowel.