It has a direct relaxant effect on the smooth muscles of the respiratory tract; partly by inhibiting phosphodiesterase to increase the intracellular cAMP content; partly as a result of the release of endogenous adrenaline and norepinephrine; it can enhance the contractility of the diaphragm and improve respiratory function; it counteracts the contractile effect of adenine and other substances on the respiratory tract.

This product is a non-steroidal anti-inflammatory drug. Its analgesic, anti-inflammatory and antipyretic effects work by inhibiting the synthesis of prostaglandins.

This product belongs to the macrolide antibiotics, which is the dodecyl sulfate of erythromycin propionate. It has antibacterial activity against Staphylococcus, various groups of streptococci and Gram-positive bacilli. Neisseria, Haemophilus influenzae, Bordetella pertussis, etc. may also be sensitive to this product. This product also has antibacterial activity against various anaerobic bacteria except Bacteroides fragilis and Fusobacterium; it also has inhibitory effects on Legionella, Campylobacter fetus, some spirochetes, Mycoplasma pneumoniae, Rickettsia and Chlamydia. This product is an antibacterial agent, but it also has a bactericidal effect on some bacteria at high concentrations. This product can pass through the bacterial cell membrane and reversibly bind to the 50S subunit of the bacterial ribosome near the donor site (P site), blocking the transfer RNA (t-RNA) binding to the P site, and also blocking the displacement of the polypeptide chain from the acceptor site (A site) to the P site, thereby inhibiting bacterial protein synthesis. This product is only effective against bacteria with active division.

It relaxes vascular smooth muscle, metabolizes to isosorbide mononitrate, and then releases nitric oxide (NO), which activates guanylate cyclase, increases cyclic guanosine monophosphate (cGMP) in smooth muscle cells, thereby relaxing vascular smooth muscle and dilating peripheral arteries and veins. Venous dilation reduces the amount of blood returning to the heart, lowers left ventricular end-diastolic pressure and pulmonary capillary wedge pressure (preload); arterial dilation reduces peripheral vascular resistance, systolic arterial pressure, and mean arterial pressure (afterload). Coronary artery dilation increases coronary perfusion, reduces myocardial oxygen consumption, increases oxygen supply, and relieves angina pectoris.

This product is a brain metabolism improving drug, a derivative of vitamin B6, which can promote glucose and amino acid metabolism in the brain, improve systemic assimilation, increase carotid blood flow, and enhance brain function. It also has a certain effect on the limbic system and reticular structure.