That year, the FDA raised concerns about adulterated drugs coming into the U.S. from two Indian factories owned by Ranbaxy and opened an investigation.

WSJ: Daiichi: Ranbaxy Shareholders Hid Information

Earlier this month, a U.S. subsidiary of Ranbaxy pleaded guilty to felony charges relating to adulterated drugs made at the two manufacturing facilities, according to the Justice Department.

WSJ: Daiichi: Ranbaxy Shareholders Hid Information

"We don't have any system in place for authenticating drugs in the U.S., " said Allan Coukell, director of medical programs at the Pew Health Group, who co-wrote a report last year on counterfeit and adulterated drugs.

WSJ: Fakes Infiltrate Injectable Drugs

The organization was "deeply concerned that these rogue Internet sites could be a front for criminals seeking to introduce adulterated medications, counterfeit drugs, or worse, to the American market, " wrote Mary Dickson, the NABP's associate executive director.

WSJ: Google Was Warned on Rogue Drug Ads

Unfortunately, when you take a sexual enhancement supplement, you have no real way of knowing whether that product is adulterated with PDE-5 inhibitors or other drugs that could have harmful effects when used without supervision.

CNN: Warning: Men's natural sex supplements may not be