
Oseltamivir comes as capsules or a syrup. You will need to take one capsule twice a day for five days to treat flu. Doctors prescribe lower doses for children, depending on how much they weigh. To prevent flu, you will need to take a capsule once a day for 10 days after exposure to the virus or for up to six weeks during an epidemic.Zanamivir comes as an inhaler (puffer), similar to the type used to treat asthma. Each puff contains a small amount of the medicine. To treat flu (once you have symptoms), you need to use the puffer twice a day for five days. To prevent flu after you’ve been exposed to someone with the illness, you will need to use it once a day for 10 days. If there is a flu epidemic, you may be prescribed zanamivir for up to...