I can't answer you for sure but I believe that the makeup of the drugs is very different. Risperdal is frequently prescribed as an anti-psychotic. Something makes me think that it is a different cat than the others. The risperdal made a patient that I was taking care of very zoned out and like a zombie...she fell alot..she was elderly. but i think the drugs are just very different....hope that helps about 1/10.......xoxox pat