I have heard that the generic brands generally are less pure than the name brand. For this reason, results are sometimes better from Adipex than the generic, phentermine. The reason for this is that Phen's makeup is slightly different from that of Adipex. This also makes sense when you consider that Adipex is a lot more expensive than Phentermine. However, if you take the generic you are still likely to have success, as the differences between the generic and name brand are barely noticeable...
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