Oseltamivir phosphate granules after eating vomiting is considered to be the stimulating effect of the drug on the gastric mucosa or an adverse reaction to the drug, it is recommended to improve the symptoms by adjusting the time of taking the drug and replacing the drug after clarifying the cause of the disease. 1. Drug stimulation: when the drug is taken on an empty stomach, the drug will have a serious stimulation effect on the gastric mucosa, which will lead to vomiting. It is recommended to adjust the time of taking the drug, take the drug after meals to reduce the stimulating effect of the drug. 2. Adverse drug reactions: Oseltamivir phosphate particles belong to the antiviral drugs, in the use of the process of vomiting may occur adverse reactions, serious cases can be replaced under the guidance of the doctor, such as amantadine, zanamivir and other drugs to treat the disease. Therefore, when vomiting occurs after taking oseltamivir phosphate granules, it is recommended to go to the hospital to clarify the cause of the disease and actively receive treatment to improve the symptoms.