This product has a broad-spectrum antibacterial effect, especially high antibacterial activity against aerobic Gram-negative bacilli. It has good antibacterial activity in vitro against the following bacteria: most bacteria of the Enterobacteriaceae family, including Citrobacter, Enterobacter cloacae, Enterobacter aerogenes, Escherichia coli, Klebsiella, Proteus, Salmonella, Shigella, Vibrio, Yersinia, etc. It often has antibacterial activity against multi-drug resistant bacteria. It has high antibacterial activity against penicillin-resistant Neisseria gonorrhoeae, enzyme-producing Haemophilus influenzae and Moraxella. It has antibacterial activity against most strains of Pseudomonas such as Pseudomonas aeruginosa. This product has antibacterial activity against methicillin-sensitive Staphylococcus aureus, and only moderate antibacterial activity against Streptococcus pneumoniae, hemolytic Streptococcus and Enterococcus faecalis. It has good antimicrobial activity against Chlamydia trachomatis, Mycoplasma, Legionella, and also has antibacterial activity against Mycobacterium tuberculosis and atypical mycobacteria. Poor antibacterial activity against anaerobic bacteria. Ciprofloxacin is a bactericide that acts on the A subunit of bacterial DNA helicase, inhibiting DNA synthesis and replication, leading to bacterial death.

Tetracycline antibiotics. This product is a broad-spectrum antibacterial agent with bactericidal effects at high concentrations. Rickettsia, Mycoplasma, Chlamydia, atypical mycobacteria, and spirochetes are also sensitive to this product. This product is more effective against Gram-positive bacteria than 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.

Clarithromycin belongs to the class of semisynthetic macrolide antibiotics. Clarithromycin can bind to the 50S subunit of bacterial ribosomes, thereby inhibiting its protein synthesis and producing antibacterial effects. It has good antibacterial effects on a variety of aerobic and anaerobic Gram-positive or Gram-negative bacteria. In vivo and in vitro data show that it has significant clinical effects on mycobacteria. It has a killing effect on Helicobacter pylori, and its activity under neutral conditions is stronger than that under acidic conditions. Clarithromycin is mainly metabolized to biologically active 14-OH clarithromycin in the human body.

This product is a histamine H2 receptor antagonist. It has an inhibitory effect on the secretion of gastric acid and pepsin. Patients with gastric and duodenal ulcers were given this product at a dose of 20 mg twice a day for 1 to 2 months, and it had no effect on the gastrin level in the blood. Normal people and patients with peptic ulcers were given this product at a dose of 20 mg twice a day for 4 weeks, and it had no effect on the levels of prolactin, gonadotropin and sex hormones in the blood.

This product is a histamine H2 receptor antagonist. It has an inhibitory effect on the secretion of gastric acid and pepsin. Patients with gastric and duodenal ulcers were given this product at a dose of 20 mg twice a day for 1 to 2 months, and it had no effect on the gastrin level in the blood. Normal people and patients with peptic ulcers were given this product at a dose of 20 mg twice a day for 4 weeks, and it had no effect on the levels of prolactin, gonadotropin and sex hormones in the blood.