It is really hard to say, could be either, or could be both. Though these meds should really not be stopped cold turkey, you should talk to your doctor and taper off of them slowly.
I have just started the switch from
Zoloft to
Cymbalta, and I know had to cut to 50mgs for one week, then to 25mgs for a week, then 12.5mgs for a week, then I am done. Much easier on you and your body that way!
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My information is not guaranteed correct. I do not get them right all the time, but I do enjoy the hunt~