Published: Sep 29, 2011 2:38 PM EDT

Pfizer Inc. and a pharmacy standards group are teaming to warn consumers about the risks of counterfeit prescription medicines, which endanger the public and take money from both pharmacies and legitimate drugmakers.
    
Pfizer Inc., whose impotence pill Viagra is widely counterfeited, and the National Association of Boards of Pharmacy on Thursday announced the start of an educational campaign to explain the dangers of counterfeit drugs and help people find legitimate pharmacies online.
    
The effort includes a website called www.AWARERx.com, a video series on a new YouTube channel called www.youtube.com/spotfakemeds, and takeovers of websites counterfeiters have previously used to sell knock-offs of Pfizer medicines.
    
Counterfeit drugs can be very dangerous, containing toxic substances such as rat poison or lead, or they can have the wrong amount of the real drug's active ingredient. In addition, people who buy medicines from illegal online pharmacies risk financial fraud and identity theft if they provide credit card or other personal information.
    
New York-based Pfizer, the world's biggest drug maker by revenue, said counterfeit versions of Viagra have been sold in at least 101 countries.
    
Pfizer and the pharmacy association estimated that worldwide sales of counterfeit medicines topped $75 billion last year, up 90 percent since 2005. Meanwhile, one in six Americans bought medicines on the Internet last year, they said.
    
"Counterfeit medicines are often produced in unsanitary conditions by people without any medical or scientific background," Patrick Ford, Pfizer's head of global security in the Americas, said in a statement.
    
Among other advice, the U.S. Food and Drug Administration urges consumers to check Internet pharmacy sites for a seal indicating they are licensed pharmacies and sell approved medicines. The blue, oval-shaped seal reads "National Association Boards of Pharmacy," around the red letters VIPPS, short for Verified Internet Pharmacy Practice Sites. A list of sites with that accreditation is at www.VIPPSpharmacies.net.
    
When Pfizer representatives bought Viagra from websites selected after an online search, all 26 sites that it tried were operating illegally and four in five were selling counterfeit Viagra, the company said.
    
The pharmacy association is a national professional group for individual state pharmacy boards, which regulate pharmacists and pharmacies, both brick-and-mortar ones and online operations. The national group recently reviewed more than 8,000 websites selling prescription drugs, determining that 96 percent appeared to not be following pharmacy laws or standards for practice.

(Copyright 2011 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.)