The US Food and Drug Administration has approved the use of Tamiflu in infants as young as two weeks old.
Tamiflu had been approved for use in adults and children over 1 year of age but the latest approval will expand the use of the drug in infants who display symptoms of flu including stuffy nose, cough, sore throat, fever and body aches.
FDA's Center for Drug Evaluation and Research's Edward Cox said that while the dosage is fixed for adults and children over 1 year of age, doctors should take into account the infant's weight before deciding the dosage with 3mg of the drug to be used for every 1kg of the infant's weight.
"Pharmacists must provide the proper dispenser when filling a prescription so parents can measure and administer the correct dose to their children. Parents and pediatricians must make sure children receive only the amount of Tamiflu appropriate for their weight", Cox said.