Can he recognise this change in behavior? I mean is he admitting to it? Is he comfortable with it?
If this becomes a problem, you can send a message to his doctor and explain that he is totally out of character for him. The doctor should be able to tell by the way that he is reacting to the meds to know which other medication he needs, if any. But these could be side effects until the meds kick in fully which takes anywhere from four to eight weeks. If these are side effects, it should end in a couple of weeks. Actually, you might get more help posting on the bipolar forum. They would be more than happy to help you. They have far more experience on bipolar issues than we do.
Bipolar is different than regular depression. And I think it is a lot more complicated. And the members over there would understand your situation and most likely know what happens when a med isn't right for a person. But we will help you as much as we can.
Hugs, Karen