I am on 10mg lexapro (escitalopram) and 8mg of diazepam daily.the last2 2 weeks i am irritable and aggressive.my dr put me on centrax for a month.i feel better,why?

Individual response.: Different individuals respond to different medications even if the medications belong to the same class of medications. Diazepam is a longer acting benzodiazepam but Centrax, Prazepam is shorter acting benzodiazepine . It could be also explained by the antidepressant working and you are less depressed. As they say, depression is "frozen anger".