Oseltamivir phosphate is typically available in capsule form and is taken orally with or without food. It is usually prescribed to be taken twice daily for five days to treat the flu, and once daily for up to 10 days to prevent the flu in people who have been exposed to the virus.
Oseltamivir phosphate can interact with other medications, so it is important to inform a healthcare provider of all medications and supplements being taken before starting treatment with oseltamivir phosphate. It is also important to note that oseltamivir phosphate is not a substitute for the flu vaccine and should not be used in place of vaccination for the prevention of influenza.