Fleet Enema is a saline laxative that provides reliable relief from occasional constipation without pain or spasm. You may be constipated if you have three or fewer bowel movements in a week, and your stools are hard, dry and difficult to pass. Fleet Enema works by increasing water in the intestine to soften the stool to help produce a bowel movement. It is ideal for bowel cleansing before undergoing a rectal examination.