Does Abilify cause weight gain?

Abilify is an antipsychotic medication which affects your metabolism and in general antipsychotics may increase weight gain but specifically with Abilify it may also cause weight loss, increased/decreased appetite and may even cause anorexia.
It depends how your organism reacts to the drug, some people may put on weight, some stay the same and others lose weight. Everyone reacts differently to the medication, benefits, potential risks, side effects, interactions, etc..