Effexor (venlafaxine) and Adderall (amphetamine/dextroamphetamine) serve different purposes. Effexor is an antidepressant used to treat depression and anxiety by affecting serotonin and norepinephrine levels in the brain. Adderall, a stimulant, is prescribed for ADHD and narcolepsy, helping to increase focus and reduce hyperactivity. Both medications can have side effects, and they should be used under medical supervision.