There are the following quinolones: nalidixic acid, pyridoxic acid, norfloxacin, ciprofloxacin, enrofloxacin, ofloxacin, levofloxacin, flurofloxacin, lomefloxacin, pefloxacin, tofloxacin, sifloxacin, etc. All the above drugs belong to the quinolones. Most of the quinolones are better absorbed orally, with relatively high blood concentration and relatively long half-life, most of which are above 3.5-7 hours. And the binding rate with plasma protein is low, the distribution in the body is wide, can enter the bone and joint, prostate and other tissues, mainly through the liver metabolism, by the kidney excretion of the difference is relatively large, the current class of drugs such as levofloxacin, ciprofloxacin in the clinical application is very wide.