sorry for late response, i take lexapro, low dosage (2.5 of a 5mg tablet) since i also have bipolar.
I used to take abilify for my bipolar depression and it just sucked the hunger right out of me. it took me almost a year to re-regulate my hunger/appetite.
However, the lexapro hasn't done this to me before, I've been on it for a little over 6 months.