Oil retention enema
A rectal injection of mineral oil or vegetable Oil, introduced at low pressure and retained for 30 minutes to 3 hours before being expelled. given to soften feces in cases of constipation or impaction. The volume of oil is relatively low, four to six ounces are commonly used, which allows the oil to be more easily retained.
It is common for a second enema to be adminstered to help the individual expel the softened feces. This is usually a large volume tap water or soapsuds enema, or a small volume phosphate enema such as fleets. Some individuals may experience a bowel movement as a result of the oil enema alone. In those cases the amount of stool passed should be assessed to determine whether a followup enema is necessary.