Time released meds are supposed to be tough after bypass. I can tell you that I take Trintellix (was Brintellix) for depression (though it is apparently immediate release) - 1x per day at bedtime. I did increase my dose post-op, but I don't know if that is so much to do with the malabsorption of med as it has to do with just general additional emotions that come with the rapidly changing body and release of hormones as you lose (plus I got laid off which really was a blow to my ego!). Anyway, I still wouldn't change the surgery for a moment. They can adjust your meds, but it will take some time and adjustment.
Good luck with your decision.