Took a cleansing enema 500 ml tap water for consitipation yesterday. when will my normal bm occur?

Constipated?: Typically, after an enema, the results are almost immediate. you should have had some result, after a entire day. If you are sure, that this is constipation and nothing more serious such as bowel obstruction then you can try increasing the water amount to a liter, and adding soapsuds or mineral oil to the tap water. http://www.enemabasics.com/types2.html