Cheap and popular US diet pill holds its own amid new rivals
Viewed as relatively safe and effective, phentermine commands 80% of market
New York
THE US Food and Drug Administration (FDA) has approved several new weight-loss drugs in recent years, but the bestselling diet pill in America isn't among them.
That title belongs to phentermine, a generic drug that has been around for decades and has managed to hold its own despite the arrival of new competitors.
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