Oseltamivir acetate is primarily used as an antiviral medication to treat and prevent influenza infections, particularly influenza A and B. It is commonly prescribed to reduce the severity and duration of flu symptoms when administered within 48 hours of symptom onset. It is also used as a preventive measure in individuals who have been exposed to the flu virus, especially in high-risk groups such as the elderly, young children, and those with compromised immune systems. Additionally, it is often utilized during flu outbreaks in communities or healthcare settings to control the spread of the virus. The medication works by inhibiting the neuraminidase enzyme, which is essential for the replication and spread of the influenza virus in the body.