Yesterday's WashPost had an article on the results of drugs after they'd been taken for a while, and said Rare and sometimes serious side effects are often discovered only when a drug is used by a much larger and more varied group of patients than exposed to it in clinical trials leading to its approval. (http://www.washingtonpost.com/wp-dyn/content/article/2010/06/16/AR2010061605931.html)
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