Good question. I will tell you what the trials indicated.
Of the first 12 weeks, during two of the weeks and at no point in between there was a mild drop in pain for the ones that got cymbalta compared to placebo for fibromyalgia. The data beyond that didn't show any benefit beyond 3 months.
There still needs to be some confirmatory work though. Basically transient results without much statistical relevance. I know this isn't how it was reported in the newspaper in the
PR-hits the drug company put out, but it is what their data showed.
In other painful conditions they (diabetic neuropathy) they were able to show much more substantial benefits and show longer out that most of them were maintained.