[They already do. E.g., from today's NY Times:]
Study Finds New Drugs May Carry Extra Hazards
By Denise Grady
Serious adverse effects from drugs often do not show up until after the drugs are marketed, researchers report today in an article that urges doctors to avoid prescribing new medicines if older, better-known ones are available.
The article, in The Journal of the American Medical Association, reviews 548 drugs that the Food and Drug Administration approved from 1975 to 1999. Sixteen, or 2.9 percent, were withdrawn because they turned out to be unsafe, and 45, or 8.2 percent, had to have warnings in black boxes added to their labels to alert doctors and patients to potentially dangerous reactions like heart, liver and blood disorders.
[http://www.nytimes.com/2002/05/01/health/01DRUG.html]
Carl
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