Feb 19, 2013 1:55 PM by NBC News
The Food and Drug Administration is advising consumers not to take unapproved flu medications sold online.
Regulators have sent warning letters to ten online retailers that are selling so-called "generic Tamiflu," which is not FDA approved.
The companies have also been told to remove false claims stating their products are the "most effective alternative to the flu shot."
While the FDA has not gotten reports of any harm from these medications, experts say products sold on the web could be too strong, not strong enough or contain the wrong drug.
Retailers have 15 days to take action or risk legal sanctions.
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