Can Adderall and Risperdal be taken together?

Yes. Using a stimulant--Adderall, Ritalin (methylphenidate), Concerta (extended release methylphenidate, and others--along with the atypical antipsychotics (such as Risperdal, Seroquel, Zyprexa, Ability) is often done, usually if aggression is present with the ADHD or if mood symptoms, such as bipolar symptoms are present. There can be side effects associated with this combination; this usually occurs when one or the other is removed or started. (in the realm of motor movements--known as dyskinesias). Folks on a stable combination don't usually have this problem. This problem particular problem goes away once doses are adjusted. Most folks don't experience this particular side effect.