1. disengage from the scene: especially when inhaling high concentrations, promptly give fresh air and oxygen, improve the partial pressure of oxygen, hyperbaric oxygen therapy is the best. 2. patients with respiratory and cardiac arrest, cardiopulmonary cerebral resuscitation measures should be carried out in a timely manner. 3. to control convulsions, sedative and antispasmodic agents such as diazepam. 4. for comatose patients can be used naloxone intravenous drip. 5. prevention and treatment of cerebral edema, pulmonary edema, early, adequate, short-range application of adrenal glucocorticoids and other treatments. 6. 6. symptomatic support treatment, such as prevention and control of infection, correction of acid-base imbalance and water and electrolyte disorders, supplementation of vitamins and other nutrients, etc.