I was on the maximum recommended dosage, first of Cymbalta & later it's generic equivalent, for... oh... a year or two (memory fails me.)

I decided to go off of it when I changed health insurers & the out-of-pocket cost skyrocketed!
I had taken myself off of other antidepressants in the past without any input from the prescribing mental health professional. However, when I decided to go off of the Cymbalta, I decided to consult my pdoc. He recommended a schedule that took me from the maximum recommended dosage down to zero over the course of 2 weeks. I thought this was very fast.

However since that was his recommendation, I decided to go with it & I didn't have any particular problems.