If the patient has symptoms of influenza such as high fever, respiratory infections and generalized muscle aches, cough and sputum, he or she may choose to take Oseltamivir, which is mainly used to treat as well as prevent influenza A and B. Oseltamivir is an antiviral drug. Oseltamivir is an antiviral drug. Oseltamivir is an antiviral drug that can be taken under the supervision of a doctor when the patient has symptoms such as headache, nausea, nasal congestion, high fever that does not go away, fatigue, loss of appetite, generalized muscle pain, cough and sputum. For people aged 13 years and above, the use of oseltamivir under the supervision of a doctor can effectively prevent influenza A and B. Clinically, Oseltamivir may cause nausea and vomiting, bronchitis, abdominal pain, earache and other adverse reactions. Oseltamivir is recommended to be contraindicated in patients who are allergic to oseltamivir as well as in patients with hepatic and biliary tract disorders. If patients want to take Oseltamivir, it is recommended to take it under the guidance of a doctor after consulting with him or her.