Potassium permanganate is safe for at least one week after gastric lavage. Potassium permanganate is an oxidizing agent, toxic and corrosive. After oral intake, it will seriously corrode the oral cavity and digestive tract, there will be a metallic taste in the mouth, burning sensation, salivation or no salivation at all, swelling of the oropharynx, nausea, vomiting, etc. For those who have taken a large dose orally, gastric hemorrhage, liver and kidney damages, severe abdominal pain, vomiting, bloody stools, and shock and other symptoms. After ingesting potassium permanganate, the stomach should be washed immediately by drinking a lot of water and then inducing vomiting. During gastric lavage, the patient’s body position should be changed continuously in order to minimize the residual potassium permanganate in the stomach. Vinegar can be added to the drinking water to neutralize the potassium permanganate. It is safe to resuscitate the patient for at least one week without any adverse effects. If potassium permanganate is ingested by mistake, it is recommended to drink a lot of water to induce vomiting and wash the stomach, and then go to the hospital immediately for standardized treatment under the guidance of the doctor, and it is not recommended to treat the patient by oneself.