Oseltamivir if used for the treatment of influenza is not a medication based on body temperature, but needs to be decided based on the condition, etc. The usual course of treatment is 5 days. Oseltamivir is an anti-influenza medication used for the treatment of influenza in people aged 1 year and older. Influenza may manifest as fever, sore throat, nasal congestion, runny nose, generalized body aches and pains. The use of oseltamivir for influenza is not based on body temperature. Influenza take oseltamivir need to be decided according to the condition, mild cases usually take the course of treatment for 5 days, if the severe cases can be appropriate to extend the duration of medication. The decision should be made by the doctor according to the severity of the disease, sensitivity to the drug and so on. Common adverse reactions to Oseltamivir include nausea, vomiting, headache, etc. It is contraindicated in people who are allergic to the drug.