(1) Cardiac arrest: adrenaline can improve the sinus node conduction system and myocardial excitability, but also make ventricular fibrillation coarser fibrillation, conducive to defibrillation. Epinephrine, as the first choice drug to rescue cardiac arrest, is widely used in clinic. It is not only suitable for the rescue of ventricular fibrillation, but also suitable for the rescue of cardiac quiescence. This is mainly due to the strong effect of epinephrine α Therefore, after intravenous or intracardiac injection, when the heart is pressed, it can produce higher aortic pressure, thus increasing coronary perfusion pressure, coronary blood flow and oxygen supply, which is conducive to cardiopulmonary resuscitation. In addition, epinephrine also contributes to the redistribution of cerebral blood flow, which is beneficial to the cerebral resuscitation of patients with cardiac arrest.

(2) Anaphylactic shock: in anaphylactic shock, small blood vessels dilate, capillary permeability increases, blood pressure drops, bronchial smooth muscle spasm, dyspnea, adrenaline can effectively treat and quickly relieve shock symptoms.

(3) Bronchial asthma: relieve acute attack.

(4) Compatibility with local anesthetics and local hemostasis: adding adrenaline to local anesthetics can make the small blood vessels at the injection site contract, delay the absorption of local anesthetics, reduce absorption poisoning, and prolong the time of local anesthesia.

(5) Treatment of urticaria, hay fever, serum reaction.