Counterfeit versions of an over-the-counter weight loss drug have been revealed by United States authorities which may have been harmful to some users.
The US Food and Drug Administration (FDA) issued a warning yesterday about fake versions of Alli (orlistat) 60mg capsules being sold over the internet after the drug's manufacturer GSK received reports from consumers late last year.
In Australia, Alli is only registered for sale in 120mg capsules.
Following tests conducted by GSK, FDA revealed that the fake versions of the drug contained sibutramine, a prescription-only ingredient which is potentially harmful for people with hypertension or a history of cardiovascular disease, instead of orlistat.
Sibutramine is currently the subject of a review by the Therapeutic Goods Administration.
According to the FDA, counterfeit Alli was in larger capsules with a white powder, instead of small white pellets; was packaged in a slightly taller bottle with a wider cap; and carried an expiry date that included the day, month and year instead of just the month and year.