Abilify does cause weight gain , by my research on the atypicals (antipsychotics)....they ALL have a side effect of weight gain and elevated blood sugar. My Psychiatrist told me I WOULDN'T gain weight while taking Abilify. I gained 40# in one year on Abilify!
Doctors will lie about side effects of meds, just to get you to try another med. You must do your own research.
Best wishes on your search!