The best time for gastric lavage after drug poisoning is such that the purpose of gastric lavage is to expel the residual poison from the stomach as soon as possible through the operation of gastric lavage in order to reduce absorption, so the earlier the time for gastric lavage after drug poisoning, the better. The time limit for the emptying of the human stomach is about 4-6 hours, and active gastric lavage can be performed within this time frame of 4-6 hours. However, it also depends on the specific situation of the poison taken. After taking poison on an empty stomach, the absorption is faster, and after meals, it is relatively slow. At the same time, active diuresis is carried out to promote the metabolism and excretion of the poison, and there are some drugs with special antagonists, and treatment with special antagonists is carried out, and this targeted treatment can also give symptomatic treatment for complications after poisoning.