Oseltamivir phosphate is an antiviral drug, mainly for the flu virus during the use of drugs, if young children in a clear diagnosis of influenza virus infection, you can apply Oseltamivir phosphate, according to the weight of young children specifically adjust the medication. During the application of oseltamivir phosphate, attention must be paid to the application within 48 hours, if more than 48 hours of fever, even if the influenza virus, the application of the drug is not very meaningful, and side effects are also relatively large. And oseltamivir phosphate in the application period, must pay attention to the management of the gastrointestinal tract of young children, the drug has a more serious stimulation of the gastrointestinal tract, especially small infants and young children after using the drug, there may be nausea, vomiting, abdominal distension, diarrhea and some other side effects, if the gastrointestinal symptoms of young children is more obvious is not recommended to take orally, if necessary, switch to intravenous fluids for treatment.