Although Abilify (aripiprazole) has been found to cause less weight gain than other atypical antipsychotics, there is evidence that in certain people it can cause significant weight gain and it may be more likely to cause weight gain in people who are taking it for depression alongside other antidepressants. Side effects such as weight gain may be significant enough for some people to discontinue Abilify, even when it is working well to manage symptoms.