To confuse the matter further, there is a side effect to antidepressants called disinhibition, which is NOT mania and NOT related to mood disorder. It simply means that the dose is too high and is causing the child to lose his natural inhibitions. No matter what you decide, I would not increase the Lexapro.
If you're interested in trialing Trileptal, I agree with Susie -- I'd recommend trying it without any other medications involved. It's the only way you're going to know if it's working or not. Trileptal cannot overcome the bad effects of either ADHD stimulants or antidepressants if you are indeed seeing medication-induced mania or cycling.
