My husband started taking Viibryd a week ago. He'd previously been on Celexa and then Zoloft. He did better on Celexa at first, but then it seemed like he needed an increase in the dosage, but his doctor switched him to Zoloft instead. When he asked about switching back, his doctor gave him a Viibryd starter pack to try. He was ok the first day, but then became very angry and hostile for the next few days (not just to me). It's been a week and the anger seems to come in waves and then go away. He's also sleeping a lot more although he would sometimes sleep a lot when he was on the other medications too. Will the anger and aggression get better as he progresses through the increased dosage in the packet, or could this be an adverse reaction to the drug that means he should switch back to something else?