Risperidone is an atypical (second generation) antipsychotic. Vyvanse
(lisdexamfetamine) is a stimulant. Zoloft (sertraline) is an anti-depressant
. Methylphenidate is a stimulant. Your son is taking two stimulant medications which are generally indicated for ADHD, and sertraline, an anti-depressant, indicated for the treatment of depression. Risperidone is typically indicated for bipolar disorder, or schizophrenia, however, it may have additional uses as well.