( CNN ) -- Americans should avoid buying treatments for the H1N1 virus , commonly known as swine flu , online , the Food and Drug Administration warned . FDA has warned Americans away from online H1N1 medication and toward regulated distribution points . `` Products that are offered for sale online with claims to diagnose , prevent , mitigate , treat or cure the 2009 H1N1 influenza virus must be carefully evaluated , '' FDA Commissioner Margaret Hamburg said . The FDA issued the warning Thursday after it had purchased products over the Internet that were supposed to be Tamiflu and analyzed them . Tamiflu is one of two approved anti-viral treatments for H1N1 . The other is Relenza . None of the products received by the FDA were approved for sale in the United States , and they contained various levels of oseltamivir phosphate , the drug in Tamiflu . `` Medicines purchased from Web sites operating outside the law put consumers at increased risk due to a higher potential that the products will be counterfeit , impure , contaminated or have too little or too much of the active ingredient , '' Hamburg said . In addition , the products did not arrive soon enough to treat someone infected with H1N1 , or who had been exposed to the virus .
FDA issued the warning after it had purchased drugs over the Internet . The products received by FDA were not available for retail sale . Agency : Meds purchased from unreliable sources put consumers at risk .