Ostavir phosphate is a new type of neuraminidase (NA) inhibitor with high selectivity. It can be used for the treatment and prevention of influenza virus infection, bronchitis associated with infection, pneumonia, systemic pain, and severe fever, especially for influenza A and B viruses. In 1999, oseltamivir was listed in Switzerland. A large number of clinical practices have proved that it has the advantages of high efficiency, drug resistance, good patient tolerance, and high safety. It is widely used in clinical practice to prevent and treat influenza.