Adverse Effects and Toxicology Complete Practice Test 2026

Whole-bowel irrigation uses a polyethylene glycol–electrolyte solution to flush everything through the entire GI tract, rather than relying on adsorption to charcoal. This method is especially helpful when there are intact large pills or sustained-release formulations that charcoal wouldn’t reliably adsorb, and when there are body-packers whose packets need to pass safely without breaking. It’s also chosen when activated charcoal is not appropriate or may be contraindicated, such as in certain ingestions where charcoal wouldn’t help or could cause harm (for example, caustics or hydrocarbons, or when rapid GI clearance is needed). In short, polyethylene glycol lavage physically clears the gut contents and is preferred in situations where charcoal would be ineffective or unsafe, such as with large/sustained-release pills or body-packers.