Cymbalta side effect?

[Mono1115]

I started Cymbalta two and a half weeks ago for pain issues (possible myofascial pain syndrome).  The first week I felt fine, no issues. Even started to notice elleviation of my pain.  Then this past Tuesday I noted the pain in my legs starting to return. Wed till now my left arm has felt-well, twitchy? Almost like I had too much coffee. but JUST THAT ARM. I did notice a rapid heartbeat yesterday, but thought maybe I drank too much coffee.  My dose has been the same, no changes.  Is it possible this arm this is a side affect?

[Gearhead]

I had the same thing. It sort of felt like the muscles in my arm were trying to do [something] that I didn't know about, and also-I know this is weird but it's very hard to describe-as if the bones in my hands were moving but the rest of my hand wasn't. I also got the rapid heartbeat and the coffee OD feeling. I felt as if I was going to crawl out of my skin.

I stopped taking it after about three weeks because it was SO uncomfortable, and my pdoc got worried become manic. So  can't tell you if that's going to go away or not, only that you're not the only one.