It can directly stimulate adrenaline receptors, and can also indirectly stimulate adrenaline receptors by prompting adrenaline nerve endings to release norepinephrine. It has a stimulating effect on both alpha and beta receptors. It can dilate bronchi and constrict local blood vessels, and its action time is longer; it strengthens myocardial contractility, increases cardiac output, and makes venous return to the heart sufficient; it has a stronger central nervous system stimulating effect than adrenaline.

It has ① antihistamine effect, which can compete with histamine released from tissues for H1 receptors on effector cells, thereby stopping allergic reactions; ② at the same time, it inhibits central nervous system activity and causes sedative and hypnotic effects; ③ it enhances the effect of antitussive drugs.

It reduces peripheral vascular resistance, increases cardiac output, reduces venous pressure, activates fibrinolysis, reduces fibrinogen levels, prevents platelet aggregation, promotes the synthesis of pyrimidine nucleosides (NAD and NADP), increases the concentration of adenine nucleosides (AMP, ADP and ATP), and finally hinders lipolysis, reducing elevated cholesterol and triglyceride levels

Immunomodulators

Not yet clear

It has a significant inhibitory effect on gastric acid secretion and can also inhibit the secretion of pepsin