Whether or not you can take oseltamivir with a flu shot needs to be determined by the vaccine activity. If the patient had an attenuated flu vaccine, they cannot take oseltamivir. If the patient has an inactivated influenza vaccine, he or she can take Oseltamivir. Influenza vaccine is made by artificial means to weaken or eliminate the virulence of the influenza virus, and oseltamivir has an antiviral effect, and can be used to treat influenza A and B in people over the age of 1 year, as well as to prevent influenza A and B in people over the age of 13 years old, the general attenuated influenza vaccine can not usually be taken with oseltamivir. This is because taking oseltamivir after an attenuated influenza vaccine may decrease vaccine activity and may not help stimulate the body to produce antibodies. In the case of inactivated influenza vaccine, oseltamivir can usually be taken after the flu shot under the supervision of a doctor. It is recommended that patients who need to take oseltamivir after the flu vaccine should consult their doctor, who will determine whether they can take oseltamivir according to the nature of the vaccine and the patient’s physical condition. In addition, patients should follow the doctor’s instructions to take oseltamivir, and it is worth noting that some patients may have rashes, abdominal pain and other adverse reactions after taking oseltamivir.