It participates in amino acid metabolism, synthesis of neurotransmitters, synthesis of collagen and tissue cell interstitial, can reduce the permeability of capillaries, accelerate blood coagulation, stimulate coagulation function, promote iron absorption in the intestine, promote the decrease of blood lipids, increase resistance to infection, participate in detoxification function, and has antihistamine effect and prevents the formation of carcinogens (nitrosamines).

It promotes brain metabolism and improves brain circulation by reducing cerebrovascular resistance and increasing cerebral blood flow. It also enhances the function of the ascending activation system of the brainstem reticular structure, the function of the pyramidal system, improves motor paralysis, and promotes the recovery of brain function and awakening.

It has a broad-spectrum antimicrobial effect in vitro, including aerobic Gram-negative and Gram-positive bacteria, anaerobes, Rickettsia, spirochetes and Chlamydia. It has a bactericidal effect on influenza bacilli, Streptococcus pneumoniae and Neisseria meningitidis; it only has an antibacterial effect on anaerobic bacteria such as Staphylococcus aureus, Streptococcus pyogenes, Streptococcus viridans, group B hemolytic streptococci, Escherichia coli, Klebsiella pneumoniae, Proteus mirabilis, Salmonella typhi, Salmonella paratyphi, Shigella, Bacteroides fragilis, etc. Pseudomonas aeruginosa, Acinetobacter, Enterobacter, Serratia marcescens, indole-positive Proteus, methicillin-resistant Staphylococcus and Enterococcus are usually resistant to chloramphenicol. Chloramphenicol is fat-soluble, enters bacterial cells by diffusion, and reversibly binds to the 50S subunit of the bacterial ribosome, inhibiting the action of transpeptidase and preventing protein synthesis.

1. It has obvious bronchodilator effect; 2. The duration of bronchodilator effect is longer than other similar drugs; 3. It has excellent selectivity for beta 2-receptors; 4. It has anti-allergic effect and can inhibit the immediate and delayed increase of airway reactivity; 5. It promotes the movement of respiratory cilia and increases the defense ability of the respiratory tract; 6. It has an inhibitory effect on the occurrence of exercise-induced asthma.