Tinidazole is often combined with other anti aerobic drugs to treat septicemia, respiratory tract infection, abdominal and pelvic infection, unclean abortion, cellulitis caused by various anaerobic bacteria. Metronidazole is the first generation of nitroimidazole antibiotics, tinidazole is the second generation, ornidazole is the third generation. The mechanism of action of this kind of drug is that it can inhibit the redox reaction of protozoa, break the nitrogen chain of protozoa, and play its role in killing protozoa. When drugs enter susceptible microbial cells, their nitro groups are easily reduced to cytotoxic amino groups by electron transfer proteins under anaerobic or hypoxic environment and low redox potential, which can inhibit the synthesis of cellular DNA, reduce the price of synthesized DNA, destroy the double helix structure of DNA or block its transcription and replication, so as to make cells die and play its role in killing anaerobes, killing bacteria and killing bacteria Effective control of infection.