Bipolar Disorder is also known as "Manic Depressive Disorder". This forum is for questions and support for people with, or for loved ones of people with Bipolar Disorder. The forum covers topics ranging from Aggressive Behavior, Affect on friends and Family,
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So whereas it's an atypical AP but it also possesses a stabilization property. Since it was one of the oldest produced atypicals and perhaps the oldest even, most pdocs start by it along with an anxiolytic. so i would go for it so long that she doesn't complain from it. as to side effects, like the others some weight gain of course.
for mixed states, i found seroquel very effective by all means, it stops it immediately.
i really have no clue why a pdoc prefers a certain AP than another, i presume it's trial and error as one of them told me. As to why the pdoc didn't recommended an AC say rather an AP to start with, i suppose because she is very young.
good luck