It plays an important role in the development of the fetus and infants, the integrity of epithelial tissue, vision, reproductive organs, the stability of blood calcium and phosphorus, and the growth and development of bones and teeth.

It plays an important role in the development of the fetus and infants, the integrity of epithelial tissue, vision, reproductive organs, the stability of blood calcium and phosphorus, and the growth and development of bones and teeth.

Vitamins A and D are essential substances for human growth and development, especially for the development of fetuses and infants, the integrity of epithelial tissue, vision, reproductive organs, the stability of blood calcium and phosphorus, and the growth and development of bones and teeth.

Vitamins A and D are essential substances for human growth and development, especially for the development of fetuses and infants, the integrity of epithelial tissue, vision, reproductive organs, the stability of blood calcium and phosphorus, and the growth and development of bones and teeth.

Azithromycin is a 15-membered macrolide antibiotic. In vitro tests have shown that azithromycin has antibacterial effects on a variety of common pathogens in clinical practice, including 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, which mainly binds to the 50S subunit of the bacterial ribosome and inhibits RNA-dependent protein synthesis.

This product is a semi-synthetic 14-membered macrolide antibiotic. Its antibacterial spectrum and antibacterial effect are basically similar to those of erythromycin. Its effect on Gram-positive bacteria is slightly worse than that of erythromycin, and its effect on Legionella pneumophila is stronger than that of erythromycin. Its antimicrobial effect on Chlamydia pneumoniae, Mycoplasma pneumoniae, and Ureaplasma urealyticum is similar to or slightly stronger than that of erythromycin. This product can penetrate the bacterial cell membrane and reversibly bind to the 50S subunit of the bacterial ribosome near the donor (P position), blocking the transfer RNA (t-RNA) from binding to the P position, and also blocking the transfer of the polypeptide chain from the acceptor position (A position) to the P position, thereby inhibiting bacterial protein synthesis.

This product is a semi-synthetic 14-membered macrolide antibiotic. Its antibacterial spectrum and antibacterial effect are basically similar to those of erythromycin. It is slightly less effective than erythromycin against Gram-positive bacteria, but stronger than erythromycin against Legionella pneumophila. Its antimicrobial effect against Chlamydia pneumoniae, Mycoplasma pneumoniae, and Ureaplasma urealyticum is similar to or slightly stronger than that of erythromycin. This product can penetrate the bacterial cell membrane and reversibly bind to the 50S subunit of the bacterial ribosome near the donor (P site), blocking the transfer RNA (t-RNA) from binding to the P site, and also blocking the transfer of the polypeptide chain from the acceptor site (A site) to the P site, thereby inhibiting bacterial protein synthesis.