· Learn about the sideeffects of Tamiflu (oseltamivir), from common to rare, for consumers and healthcare professionals. Learn about Tamiflu, an antiviral drug for treating and preventing the flu, from the U.S. Food and Drug Administration. Find out the common and serious side effects, how to take it, and who should avoid it. · Find patient medical information for Oseltamivir (Tamiflu) on WebMD including its uses, sideeffects and safety, interactions, pictures, warnings, and user ratings · Tamiflu is a prescription drug used to treat and prevent influenza. Learn about its common, mild, and serious side effects, such as nausea, vomiting, and mental health changes, and how to manage them. Tamiflu is an antiviral drug used to treat and prevent influenza. Common side effects include nausea, vomiting, diarrhea, and headache. Serious side effects include allergic reactions, skin reactions, seizures, and behavioral disturbances. Does Tamiflu work and what are the side effects?Tamiflu suppresses and decreases the spread of influenza A and B viruses, the viruses responsible for the flu. Common side effects of Tamiflu include nausea, vomiting, diarrhea, bronchitis, abdominal pain, headache, and dizziness.Does Tamiflu cause stomach problems?Tamiflu also increased the risk of nausea and vomiting in adults by around 4 percent and in children by 5 percent. There was a reported increased risk of psychiatric events of around 1 percent when Tamiflu was used to prevent influenza.” Tamiflu (oseltamivir) Side Effects: Digestive upset (nausea, vomiting, diarrhea, stomach pain) Headache; NosebleedsHow long will side effects from Tamiflu last?Tamiflu is usually taken for five days when used for treatment and 10 days when used for prevention. However, it may be continued for 6 to 12 weeks in certain situations. Can Tamiflu cause nausea? A. The most common side effects of Tamiflu are nausea and vomiting. Usually, nausea and vomiting are not severe and happen in the first 2 days of ... Oseltamivir (Tamiflu) is a medication that prevents and treats flu infections. It may cause side effects such as nausea, vomiting, confusion, or seizures. Learn more about its uses, dosage, and precautions. Learn about Tamiflu, an antiviral drug for treating and preventing the flu, from the U.S. Food and Drug Administration. Find out the common and serious side effects, how to take it, and who should avoid it. · Find patient medical information for Oseltamivir (Tamiflu) on WebMD including its uses, sideeffects and safety, interactions, pictures, warnings, and user ratings · Tamiflu is a prescription drug used to treat and prevent influenza. Learn about its common, mild, and serious side effects, such as nausea, vomiting, and mental health changes, and how to manage them. Tamiflu is an antiviral drug used to treat and prevent influenza. Common side effects include nausea, vomiting, diarrhea, and headache. Serious side effects include allergic reactions, skin reactions, seizures, and behavioral disturbances. Oseltamivir (Tamiflu) is a medication that prevents and treats flu infections. It may cause side effects such as nausea, vomiting, confusion, or seizures. Learn more about its uses, dosage, and precautions.