tap water enema

A tap water enema is a clinical procedure involving the rectal administration of plain tap water to induce bowel evacuation or facilitate diagnostic visualization of the colon. The mechanism of action is primarily mechanical; the volume of water distends the rectum and sigmoid colon, stimulating stretch receptors that trigger the defecation reflex and increase peristaltic activity. As a hypotonic solution, tap water also serves to soften fecal matter, although its hypotonicity can lead to systemic water absorption if used excessively. It is widely utilized as a cost-effective bowel preparation for endoscopic and radiologic examinations, as well as a therapeutic intervention for fecal impaction, chronic constipation, and acute colonic pseudo-obstruction (Ogilvie's syndrome).

Other names

water enema