This product belongs to the macrolide antibiotics. It has antibacterial activity against Staphylococcus (except methicillin-resistant strains), all groups of streptococci and Gram-positive bacilli. Neisseria, Haemophilus influenzae, Bordetella pertussis, etc. are also sensitive to this product. This product also has antibacterial effects on various anaerobic bacteria except Bacteroides fragilis and Fusobacterium. It also has inhibitory effects on Legionella, Campylobacter fetus, certain spirochetes, Mycoplasma pneumoniae, Rickettsia and Chlamydia. This product is an antibacterial agent, but it also has a bactericidal effect on certain bacteria at high concentrations. It can penetrate 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) from binding to the "P" site, and also blocking the self-acceptor site ("A" site) of the polypeptide chain.

This product is a fluoroquinolone antibacterial drug with a broad-spectrum antibacterial effect, especially high antibacterial activity against aerobic Gram-negative bacteria. It has good antibacterial activity against the following bacteria in vitro: most bacteria of the Enterobacteriaceae family, including Citrobacter, Enterobacter cloacae, Enterobacter aerogenes and other Enterobacter species, Escherichia coli, Klebsiella, Proteus, Salmonella, Shigella, Vibrio, Yersinia, etc. Norfloxacin also has antibacterial activity against multi-drug resistant bacteria in vitro. It also has good antibacterial effects on penicillin-resistant Neisseria gonorrhoeae, Haemophilus influenzae and Moraxella catarrhalis. Norfloxacin is a bactericide that acts on the A subunit of bacterial DNA helicase, inhibiting DNA synthesis and replication, leading to bacterial death.

It can inhibit the synthesis of prostaglandins and has antipyretic and analgesic effects

It is a central nervous system stimulant that can constrict cerebral blood vessels and reduce the amplitude of their pulsation.

It is a histamine H1 receptor antagonist that can counteract capillary dilation caused by allergic reactions (histamine), reduce capillary permeability, and relieve wheezing caused by bronchial smooth muscle contraction.

It has the effect of clearing away heat, detoxifying, removing phlegm and calming the nerves

This product is a semi-synthetic cephalosporin broad-spectrum antibiotic. The antibacterial spectrum is similar to that of cephalothin, but the antibacterial activity is poorer than that of cephalothin. This product is stable to the penicillinase produced by Staphylococcus aureus, so it has a good antibacterial effect on penicillin-resistant Staphylococcus aureus. Except for Enterococcus and methicillin-resistant Staphylococcus, most Gram-positive cocci are sensitive to this product. This product has a good antibacterial effect on Neisseria, and has antibacterial effects on some Escherichia coli, Proteus mirabilis, Klebsiella pneumoniae, and Salmonella; it has a poor effect on Haemophilus influenzae; other Enterobacteriaceae, Acinetobacter, Pseudomonas aeruginosa, and Bacteroides fragilis are resistant to this product. The mechanism of action of this product is to inhibit the synthesis of bacterial cell walls.

By hindering the bacterial transpeptidation process and inhibiting bacterial protein synthesis, it has antibacterial effects on a variety of Gram-positive aerobic bacteria, Gram-negative aerobic bacteria, anaerobic bacteria, sexually transmitted disease microorganisms and other microorganisms. The mechanism of action is the same as that of erythromycin, mainly binding to the 50S subunit of the bacterial ribosome to inhibit RNA-dependent protein synthesis.