PPA is Piperidic acid, which belongs to the quinolone class of drugs and has antibacterial effects on gram-negative bacilli such as Escherichia coli, Klebsiella pneumoniae, Salmonella typhi and Shigella, and is mainly used clinically to treat bacterial enteritis and urinary tract infections. The second-generation quinolone antibiotic pirfenamic acid is a synthetic antibacterial drug, usually known as so-and-so fasicin, which mainly acts on bacterial DNA helicase, affecting the production of bacterial DNA, which in turn leads to bacterial death and has an inhibitory effect on bacteria. It is mainly used for urinary tract infections and gastrointestinal infections caused by gram-positive bacteria, such as Escherichia coli, Klebsiella, Aspergillus, Serratia spp. and Shigella spp. due to the high value of bile concentration in urine after digestion and absorption. Piperidic acid side effects can occur as nausea, vomiting, eructation, upper abdominal discomfort, loss of appetite, constipation and other gastrointestinal reactions. Some PPAs also cause elevated transaminases, creatinine urea nitrogen, and sometimes headache, dizziness, lethargy, dry mouth and other adverse reactions, which should be stopped promptly. The side effects of Piperidic acid tablets need to be clarified by medical examination, it is a drug will have side effects, all drugs should not be taken for a long time, side effects include toxic reactions, although the treatment of drugs have side effects, but some drugs are not harmful.