Comparative studies: Studies comparing 3 or more drugs, head to head, are what you are looking for. Seems like drug companies are not doing those studies, so we don't really know which drugs are better. A doctor's favorite drug may be the one that has been in use longest, the one he has had years of experience with, or the one that is available to his patients (on formulary). Demand the company do comparative studies.
Answered 12/9/2013
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