Dibasic Sodium Phosphate/Monobasic Sodium Phosphate Enema What Dibasic Sodium Phosphate/Monobasic Sodium Phosphate Is Used For: It Is Useful As Laxatives In The Relief Of Occasional Constipation And As Part Of A Bowel Cleansing Regimen In Preparing The Colon For Surgery, X-Ray Or Endoscopic Examination