Oseltamivir has an antiviral effect and is mainly used for the prevention and treatment of influenza A and B. However, it is generally used prophylactically and can only be used in adolescents and adults aged 13 years or older, and treatment can only be used in children and adults aged one year and older. Oseltamivir only plays the role of influenza prophylaxis during the medication period, it cannot replace the influenza vaccine and does not affect the vaccination, that is, there is such a patient with renal insufficiency, the medication regimen is to be adjusted. If it is used for the treatment of influenza, it is better to start taking oseltamivir within two days of the start of influenza symptoms, preferably within thirty-six hours, so that the effect is better. If used for prophylaxis, the medication should be started within two days after close contact with the influenza patient.