Twitching and cramps is listed as an "infrequent" side effect of the drug you mentioned. God only knows what that means to someone who is already twitching! That drug is also known for causing seizures and if you already have risk factors for seizures the chances go up dramatically. So I would guess it might exacerbate twitching if you are already having that problem.
That drug is also known to cause anxiety. It tends to "rev up" most people more than the straight SSRIs. (It is believed to work indirectly through metabolites created by your liver which affect dopamine and norepinephrine reuptake, making more of those chemicals available to your greedy little brain.) Oh, also it does have some effect on serotonin, too.
I would hate to think it would be prescribed for someone with a lot of anxiety without something else to take the edge off, at least at first.
I'm sure your doctor warned you that once in awhile people try to whack themselves on these meds, which is something to be aware of.
And yes, I get back twitches too, and ones in the abdomen, too. I don't think there is a place you can name that people have not reported twitching at some point.
