Here In America Adipex-P is the most common. Phentermine Background Phentermine was the Phen in the controversial Fen-Phen diet that was found to cause heart valve problems in some patients in 1997. Phentermine was not determined to be a source of the problem. Below are some links to various industry articles from the American Heart Association as well as informational articles about the drug phentermine, which is an appetite suppressant. Another good non commercial fact sheet about phentermine can be found here .
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