Whole Bowel Irrigation

The polyethylene glycol–electrolyte solution is iso-osmotic, so it promotes intestinal flow without substantial net movement of water or electrolytes across the gastrointestinal tract. This allows continuous lavage while reducing the fluid and electrolyte exchange that could otherwise complicate gastrointestinal decontamination. The process continues until intestinal contents are cleared and rectal effluent becomes clear.

Sustained-release and enteric-coated formulations may remain in the gastrointestinal tract while releasing drug over time or resisting early dissolution. Whole Bowel Irrigation can rapidly move intestinal contents through the bowel, helping limit the opportunity for continued absorption. In pharmacology, this makes the approach particularly relevant when the formulation may prolong gastrointestinal exposure after ingestion.

The principal endpoint is clear rectal effluent, which indicates that intestinal contents have been progressively removed through the lavage process. Reaching this endpoint does not eliminate the need for clinical assessment, because successful clearance must be considered alongside patient tolerance, the suspected substance, and risks such as vomiting, aspiration, or abdominal distension.

This method may be considered after selected toxic ingestions, particularly involving sustained-release or enteric-coated medications and substances such as iron or lithium. Its relevance depends on the clinical circumstances rather than the substance name alone. Pharmacology and clinical toxicology assessments must determine whether limiting further gastrointestinal absorption justifies the procedure's potential complications.

Administration generally involves delivering large volumes of an iso-osmotic polyethylene glycol–electrolyte solution, usually through a nasogastric tube. The solution promotes continuous intestinal lavage, and administration proceeds while assessing the patient and observing the rectal effluent. The process is directed toward clearing intestinal contents, with clear effluent serving as the principal endpoint.

Whole Bowel Irrigation requires careful patient selection because rapid intestinal lavage can cause vomiting, aspiration, or abdominal distension. Clinicians must assess whether the patient is an appropriate candidate and monitor tolerance throughout administration. These safeguards are especially important when the expected benefit of reducing absorption from a selected ingestion must be balanced against procedural risk.