It acts on the lower brain stem of the central nervous system, inhibits multi-synaptic reflexes, blocks nerve conduction from abnormally excited muscles, and produces muscle relaxation. It also acts on the higher centers of the cerebral cortex and has a weak sedative effect.

It acts on dihydrofolate synthase, interfering with the first step of folic acid synthesis. When used in combination with trimethoprim, it can double block the folic acid metabolism of bacteria and has a synergistic antibacterial effect.

It acts on the second step of folic acid anabolism, selectively inhibits the action of dihydrofolate reductase, and when used in combination with sulfadiazine, it can double-block the folic acid metabolism of bacteria, thus having a synergistic antibacterial effect.

It has a strong antibacterial effect on most anaerobic bacteria. Its bactericidal mechanism has not been fully elucidated. The nitroreductase of anaerobic bacteria plays an important role in the energy metabolism of sensitive strains. The nitro group of this product is reduced to a cytotoxin, which acts on the DNA metabolism process of the cell and promotes the death of bacteria.

Antipyretic and anti-inflammatory effects

This product is a mucus regulator, which mainly acts on the secretion of bronchial glands, increasing the secretion of low-viscosity salivary mucin and reducing the production of high-viscosity fucoxomucin, thereby reducing the viscosity of sputum and making it easier to cough up. It takes effect quickly after oral administration, and obvious therapeutic effects can be seen within 4 hours of taking it.

This product is a synthetic antibacterial anti-tuberculosis drug that can penetrate into mycobacteria to interfere with RNA synthesis, thereby inhibiting bacterial reproduction. It is only effective against mycobacteria in the growth and reproduction period. So far, no cross-resistance has been found between this product and other anti-tuberculosis drugs.