<prompt> For a child 3-5 months age with H1N1, treatment Oseltamivir dose is20 mg OD X 5 days12 mg BD X 5 days25 mg BD X 5 days20 mg BD X 5 days  <response>: Oseltamivir Tamiflu is the drug of choice for swine flu H1N1 But its dose is given according to the age and weight of the person. Age 3 months to 12 months - 3 mgkg BD x 5 Days 1 month to 3 months - 2.5 mgkg BD x 5 Days 0 to 1 month - 2 mgkg BD x 5 Days Weight 15 kg - 30 mg BD x 5 Days 15-23 kg - 45 mg BD x 5 Days 24-40 kg - 60 mg BD x 5 Days 40 kg - 75 mg BD x 5 Days 