JD Serendipity, at least in part, often underlies discoveries of new uses for already existing or shelved drugs. One of the reasons why is that we do not have full knowledge of the mechanism of action for many drugs on the market today. Aspirin is a great example of a common medication that we use without fully understanding how it works. Many drugs in clinical use today were discovered empirically, not necessarily through applied understanding of their precise molecular mechanism of action.
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