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Shopper's Market: Are some websites hazardous to your health?

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Certain web sites may be hazardous to your health.

The FDA cracking down on thousands of online pharmacies selling fake drugs.

And not just a regular folks like you and me.

But -- medical professionals as well Lisa -- is the prescription drugs editor for consumer reports.

She says approximately one point seven million people use online pharmacies but the counterfeit drugs they could be selling.

Carry a very big risk including medication that is water down.

So it's not really affected as you expected today.

And I can be pretty dangerous for things to my medication that you need your system over a long period of time.

Some of the drugs seized by the FDA Viagra Accutane.

And -- come -- -- which is not FDA approved and contains the wrong active ingredient.

Gil says -- a -- doesn't require a prescription it's probably bogus.

Also watch out for sites that don't let you speak with the pharmacists don't have an address in the US.

Aren't licensed on the FDA's web site at prices that are just too good to be true.

The FDA says many web sites falsely claimed to be operating out of Canada.

Where prescription drugs are less expensive and the drugs sold by these companies can even -- tainted by poisons or other substances.

In New York Brenda Buttner Fox News.