Glaxo Hoped Alli Weight Loss Drug Would Have Sold Better

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The only over-the-counter, federally approved weight loss pill in the U.S. isn't exactly flying off shelves, but it's not because Americans are getting any slimmer.

GlaxoSmithKline said Wednesday that 4 million people have tried alli since the drug hit shelves a year ago. Alli is the only nonprescription weight loss pill approved by the Food and Drug Administration.

As a drug that should theoretically trigger huge sales, the preliminary figures are "pretty underwhelming," said Steve Brozak, an analyst with WBB Securities.