Also known as penicillin G, penicillin G, penicillin, penicillin sodium, benzylpenicillin sodium, penicillin potassium and benzylpenicillin potassium I, as well as cephalosporins and atypical β -lactams. Penicillin is a kind of antibiotic, which refers to an antibiotic extracted from Penicillium culture solution. It contains penicillin, which can destroy the cell wall of bacteria and play a bactericidal role in the reproductive period of bacterial cells. It is the first antibiotic that can treat human diseases. Penicillin antibiotics are the general name of a large class of antibiotics in β -lactams

2. A class of macrolide antibiotics, such as erythromycin, midecamycin, spiramycin, acetylspiramycin, josamycin and leucomycin.

3. Tetracycline broad-spectrum antibiotics produced by actinomycetes, such as tetracycline, oxytetracycline, tetracycline and semi-synthetic derivatives, such as methotrexate, doxycycline and minocycline.

4. Streptomycin is an antibiotic extracted from streptomyces griseus culture medium. Streptomycin sulfate is white or yellowish powder or crystal, which is easily soluble in water and relatively stable. It has obvious bacteriostatic and even bactericidal effects on some bacilli, especially mycobacterium tuberculosis. Streptomycin is mainly used to treat tuberculosis, plague, whooping cough, bacillary dysentery and urinary tract infection.

Chloramphenicol is a broad-spectrum antibiotic isolated from Streptomyces venezuelae.