The maximum number of days of piperacillin is not clearly specified, it needs to be decided according to the condition and other factors, clinically it is often 7~14 days. Piperacillin sodium for injection instructions do not specify the maximum time of use of this product, clinical need to be based on the severity of the infection, the site of infection, and whether it is a sensitive bacterial infection and other factors to determine the time of use, usually 7 ~ 14 days. Piperacillin sodium for injection is indicated for sepsis, urinary tract infection, respiratory tract infection, biliary tract infection, pelvic infection, abdominal infection, skin and soft tissue infection caused by sensitive bacteria. Adverse reactions such as urticaria, asthma attack, interstitial nephritis, serum sickness type reaction, leukopenia, anaphylaxis, diarrhea, nausea and vomiting are seen. The drug is contraindicated in people with positive penicillin skin test and history of allergy to penicillins. The drug should be used reasonably under the guidance of a doctor, and should not be used arbitrarily on its own.