Gastric lavage intubation is a medical procedure in which a large-bore tube is inserted through the mouth or nose into the stomach to wash out gastric contents with repeated instillation and aspiration of fluid. It is primarily used in selected cases of acute poisoning or drug overdose to remove unabsorbed toxic substances from the stomach, although its use has become limited because of the risk of complications such as aspiration, esophageal injury, electrolyte disturbances, and the availability of safer decontamination methods. The procedure should be performed only when clinically indicated, preferably within one hour of ingestion of a life-threatening toxin, and after ensuring adequate airway protection, especially in patients with impaired consciousness.