Useful as a laxative in the relief of constipation, and as a bowel evacuant for a variety of diagnostic, surgical and therapeutic indications. Dibasic sodium phosphate and monobasic sodium phosphate are poorly absorbed from the gastrointestinal tract and retain water in the lumen of the intestine. When administered rectally as an enema, they produce a watery evacuation of the bowel. Fleet Enema provides cleansing action and induces complete emptying of the left colon usually in 2 to 5 minutes.