Does Prozac, Xanax An Haldol Interfere With Each Other?

I have gotton married the last 2 years and my husband takes these 3 meds that i am not happy about..i have watched him for over a year now and seems to me he is just a slightly nervous person but his doctor is giving him meds that i have researched and feel are really bad and they dont need to be in the wrong hands...he takes prozac40mg,xanax,haldol each day isnt that alot of medicating? dont they work against each other i dont understand...from my point i cant tell he is even taking them...in fact i feel they make him agressive...please help