The human body can secrete adrenaline, whose effects are mainly to maintain blood circulation and homeostasis of the internal environment, etc.; exogenous adrenaline is mainly used to treat severe respiratory distress due to bronchospasm, anaphylactic shock, and cardiac arrests caused by various reasons. Adrenaline is a hormone secreted by the human body, which is secreted in times of excitement, fear, and stress, causing people to breathe faster, heartbeat to accelerate, pupils to dilate, etc., and providing more energy for physical activities, with the effects of regulating body metabolism, maintaining blood circulation, and adjusting the stability of the internal environment. Exogenous epinephrine is mainly an injectable preparation. It is suitable for the treatment of severe respiratory distress due to bronchospasm, anaphylactic shock, and cardiac arrest due to various causes. Common adverse reactions include palpitations, headache, and elevated blood pressure. Use with caution in the following conditions: organic encephalopathy, cardiovascular disease, glaucoma, Parkinson’s disease, thiazide-induced circulatory collapse and hypotension, psychoneurological disorders. Patients are advised to use epinephrine under medical supervision and not to use it privately to avoid adverse consequences.