Q: What are the chances of getting swine flu after giving 10 days prophylactic dose of Oseltamivir? Will the effectiveness of the drug reduce if a person suffers from swine flu later?

A:I think you are referring to the chances of a person known to have been exposed to some one with diagnosed H1N1 flu and given 10 days prophylactic treatment. Such a person should not develop any serious H1N1 infection. If you get swine flu at a later date, the drug should generally be efficacious.