Dear Donna
Cymbalta, Effexor and Pristiq are SNRIs (Serotonin and Norepinephrine Reuptake Inhibitors). (for Mari: Wellbutrin a little different affecting the dopamine/norepinephrine system).
so, while the studies i've read have all talked about SSRIs i'd think there would be some theoretical concern with Cymbalta and the other two as well, because they all inhibit serotonin reuptake. i don't know to what degree as compared to SSRIs... and if different receptor subtypes are affected... it is possible that there is inferior or no risk with these drugs.
a long way to say,
maybe.
i'll see if i can turn up anything specific for you Donna.
~ waves ~