Alli is the only FDA-approved non-prescription weight loss drug. It is a lower dose of orlistat, prescribed under the brand name Xenical. The FDA is now warning consumers about counterfeit Alli. The counterfeit pills, most of which appear to be purchased online, do not contain orlistat. Instead, they contain a controlled substance called Meridia or sibutramine. Side effects may include headache, insomnia, constipation, dry mouth, increased blood pressure and heart rate. The drug can also interact in a dangerous way with many other medicines. To check on Alli, open a capsule and see if it is filled with tiny white pellets or white powder. The powder is counterfeit and should be reported to the FDA.

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