Toilet bowl cleaner and 84 disinfectant mixed together will produce toxic gas and should not be mixed together. Because the main component of toilet bowl cleaner is a high concentration of hydrochloric acid, 84 disinfectant is the main component of sodium hypochlorite, if the two mixed, there will be a neutralization reaction, rapid generation of chlorine gas. Chlorine gas is a highly toxic substance, which acts with carbon monoxide at high temperatures to produce a more toxic phosgene. Chlorine gas is a strong irritant to the eyes and respiratory system mucous membranes, the lighter may cause coughing, chest tightness, etc., the heavier may occur lung bruising and edema, causing breathing difficulties, or even death. After mixing toilet bowl cleaner and 84 disinfectant together by mistake, chlorine poisoning should be removed from the scene immediately and moved to a ventilated and airy environment, and call 120, and the patient can be made to lie down and rest during the waiting period for first aid, and oxygen can be given if available, and the patient’s consciousness, breathing and heartbeat should be judged at any time, and cardiopulmonary resuscitation should be performed on the spot if breathing and heartbeat have stopped. After arriving at the hospital, while stabilizing the vital signs, the patient can be given hemodialysis detoxification treatment under the guidance of the doctor. If the symptoms are mild, accompanied by mild dizziness, headache, vomiting, abdominal pain, diarrhea, etc., you can hydrate more or follow medical advice to promote the discharge of chlorine by intravenous rehydration. In addition, if abdominal pain and diarrhea occur, antispasmodic and antidiarrheal drugs, such as montelukast and scopolamine, can be used.