The expiry dates for Tamiflu and Relenza, range from May 2010 to December 2013.
Changes have also been made in Wales to support interim arrangements so that people can access antiviral drugs quickly should they require them.
The latest moves come as the total number of confirmed swine flu cases in the UK rises to 71.
The new cases involved one adult and one child from London, and a child from the east of England. They all picked up the virus through contact with people already diagnosed with swine flu.
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