Tetracycline antibiotics. This product is a broad-spectrum antibacterial agent with bactericidal effects at high concentrations. Many Rickettsia, Mycoplasma, Chlamydia, atypical mycobacteria, and spirochetes are also sensitive to this product. This product is better than Gram-positive bacteria for Gram-negative bacteria, but Enterococcus is resistant to it. Others such as Actinomycetes, Bacillus anthracis, Listeria monocytogenes, Clostridium, Nocardia, Vibrio, Brucella, Campylobacter, and Yersinia are sensitive to this product. This product has certain antibacterial activity against Neisseria gonorrhoeae, but penicillin-resistant Neisseria gonorrhoeae is also resistant to doxycycline. Due to the widespread use of tetracyclines over the years, common clinical pathogens have become seriously resistant to this product, including Gram-positive bacteria such as Staphylococcus and most Gram-negative bacilli. There is cross-resistance between this product and different varieties of tetracycline antibiotics. The mechanism of action of this product is that the drug can specifically bind to the A position of the bacterial ribosome 30S subunit, inhibiting the growth of the peptide chain and affecting the synthesis of bacterial protein. Animal experiments have confirmed that this product is teratogenic. In vitro tests have shown that this product may be mutagenic at a certain concentration.

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Restores the imbalance between the excitation and inhibition processes of the cerebral cortex, and has central inhibitory effects such as sedation, hypnosis and analgesia

Antibacterial and improve immune function; has a strong inhibitory and killing effect on 22 pathogens such as Staphylococcus aureus, Pneumococcus, Pseudomonas aeruginosa, Shigella dysenteriae, etc.; can significantly increase the spleen-specific antibody-forming cells of mice and stimulate beta cell proliferation; can also reduce myocardial contractility and blood pressure, thereby reducing myocardial oxygen consumption.