Efficacy of Cymbalta vs duloxetine?

I found that the duloxetine was not as effective as Cymbalta. I was taking cymbalta for nerve pain resulting from a cervical fusion. The relief was not enough to outweigh the side effects until my pain management doctor added Lyrica. For me, lyrica and cymbalta together provided the relief that I had been hoping for.

Duloxetine is generic Cymbalta. There should be no difference between the two. I would talk to your pharmacist about your additional pain and see if switching back to Cymbalta is possible. There are recognized cases where the generic doesn’t work as well as the branded medication... perhaps this is one of them. Talk to your doctor also about this.

I'm sorry to hear you're still suffering.
I too had 2 operations on my lumbar spine for stenosis and disc hernias, I now have metalwork. But, the problem is spreading up and down my spine, now affecting both cervical and sacral regions.
For me neither of the drugs work. Nothing does (only perhaps morphine, but they don't really want to go that far). Speak again with your specialist. I hope they find something to give you at least some relief.