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High-Dose Generic Wellbutrin XL Withdrawn

Are Generic Drugs Safe and Effective? continued...

A major reason generic drugs cost less than brand-name drugs is that generic drugmakers don't have to perform extensive safety and effectiveness testing. They only have to show, usually in a small number of healthy volunteers, that their drugs deliver the same active ingredients in the same way as brand-name drugs.

The FDA says generic drugs are just as good as brand-name drugs. As an example, it points to a study that analyzed 38 clinical trials comparing generic to name-brand heart drugs. The study found that the generics performed just as well.

However, the Teva withdrawal -- and the FDA's request for more tests of other Wellbutrin generics -- suggests that at least for extended-release drugs, the FDA's testing process may have been flawed.

The FDA says it's looking into this and other issues. In a recently revised generic drugs fact sheet on its web site, the agency notes:

  • "FDA is aware that there are reports noting that some people may experience an undesired effect when switching from brand name drug to a generic formulation or from one generic drug to another generic drug. FDA wants to understand what may cause problems with certain formulations if, in fact, they are linked to specific generic products.
  • "FDA is encouraging the generic industry to investigate whether, and under what circumstances, such problems occur. The Agency does not have the resources to perform independent clinical studies and lacks the regulatory authority to require industry to conduct such studies. FDA will continue to investigate these reports to ensure that it has all the facts about these treatment failures and will make recommendations to healthcare professionals and the public if the need arises."

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