The Food and Drug Administration warned Tuesday about a fake version of Teva Pharmaceutical Industries Ltd.'s (TEVA, TEVA.TV) attention-deficit drug Adderall.

The agency said the counterfeit, 30-milligram Adderall tablets were purchased on the Internet. The tablets don't contain the correct active ingredients and instead contain tramadol and acetaminophen which are pain medicines. Adderall, which has been in short supply, is approved to treat attention deficit hyperactivity disorders, or ADHDs, and narcolepsy, a sleep disorder.

The FDA said consumers should be cautious when buying their medicines from online sources. Rogue websites and distributors may especially target medicines in short supply for counterfeiting, the agency said.

The counterfeit Adderall tablets are round, white and don't have any type of markings, such as letters or numbers. Authentic Adderall 30 milligram tablets produced by Teva are round, orange/peach in color, and scored tablets with "dp" embossed on one side and "30" on the other side of the tablet, FDA said.

The FDA said anyone who believes they have the counterfeit version of Teva's Adderall 30 mg tablets shouldn't take or should stop taking the product.

 
   By Jennifer Corbett Dooren; Dow Jones Newswires, 202-862-9294; jennifer.corbett@dowjones.com