A FAKE version of the weight loss capsules Alli is being sold online according to a warning given by the Food and Drug Administration or FDA on Monday.

The Glaxo Smith Kline over the counter drug Alli has a counterfeit version that is being given to gullible dieters as 60 mg capsules and a part of a 120 capsule refill kit. The company, along with FDA has released certain pointers for customers who purchase the weight loss drug to distinguish between the correct product and its counterfeit version.

The fake drug is being sold through online auction websites like eBay.

As per Glaxo Smith Kline, the counterfeit version of Alli does not have the words "sealed for your protection" printed on the bottle's protective seal. It also does not have a LOT code, which is present on the outer cardboard packaging and a expiry date mentioning the month, day and year while the true weight loss frug only carries the month and year.

The most worrying facet about this counterfeit version of the over the counter the drug Alli is that it contains a controlled substance called Sibutramine instead of the active ingrediant Orlistat. Sibutramine should not be used by certain patients or without physician oversight and can interact in a harmful way with other drugs the consumer may be taking.

The Glaxo Smith Kline weight loss drug capsules are also slightly smaller than the counterfeit version and their content is also different.