A half dose of Qnexa, which is 7.5 mg of phentermine plus 46 mg of Topamax (topiramate), caused an average weight loss of 18.2 pounds versus 3.3 pounds with placebo, or 8.5 percent versus 1.7 percent during a six month study according to a press release from press release from Vivus, Inc, the company developing the drug.
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