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I would give Cymbalta a full month to take it's full effect, even when transitioning from Prozac. There should not be many (if any) side effects between transition from Xanax XR to Klonopin the way that you did, since the dosages were nearly the same and they are both benzodiazepines. If Prozac was not working for you, Cymbalta may help you, but my guess is that you won't notice much of a difference at all.