Alli, the reduced-strength version of GlaxoSmithKline?s orlistat (Xenical), is an approved over-the-counter weight-loss drug for overweight adults 18 years and older. Xenical is prescription only.
The U.S. Food and Drug Administration is warning consumers about a counterfeit and potentially harmful version of Alli 60 mg capsules (120 count refill kit).
Preliminary laboratory tests conducted by Glaxo revealed that the counterfeit version does not contain orlistat, but instead contained the controlled substance sibutramine.