Stimulant Use Disorder is an addiction to stimulants, including cocaine, methamphetamine, and prescription drugs such as Ritalin, Adderall, and Modafinil. Stimulants increase dopamine levels in the brain, which affects pleasure, movement, and attention. Serious consequences of stimulant misuse can include heart attacks, seizures, strokes, coma, aggression, psychotic behavior, memory loss, and an increased risk of contracting infectious diseases like hepatitis and HIV/AIDS.