Qsymia (formerly Qnexa), the Latest Obesity Drug

There are very few obesity drugs currently approved for use in the US-- not because effective drugs don't exist, but because the FDA has judged that the side effects of existing drugs are unacceptable. 

Although ultimately I believe the most satisfying resolution to the obesity epidemic will not come from drugs, drugs offer us a window into the biological processes that underlie obesity and fat loss.  Along those lines, here's a quote from a review paper on obesity drugs that I think is particularly enlightening (1):
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