Tetracycline class of antibiotics. This product is a broad-spectrum antibacterial agent, many rickettsia, mycoplasma, chlamydia, helix stabler than sensitive. Enterococcus to its resistance. Other such as actinomycetes, bacillus anthracis, monocytosis listeria, clostridium, slave card bacteria genera, vibrio, Gibraltar, campylobacter, yell, bacteria etc. This article also sensitive. Over the years because of terramycin and tetracycline class the wide application of clinical common pathogenic bacteria of terramycin element resistance phenomenon is serious, gram-positive bacteria including staphylococcus aureus and most gram-negative bacilli. This product with tetracycline antibiotics cross resistance between different varieties. This article mechanism for drugs can specificity and bacterial ribosome 30 s of A location, inhibit the growth of the peptide chain and influence bacterial protein synthesis.