Schedule II drugs are the most-controlled type of drugs that a doctor can write a prescription for. Some drugs that are usually illegal are on Schedule II. They are on Schedule II instead of Schedule I because sometimes, they can be used for medical reasons. For example, Schedule II includes cocaine, because it can stop bleeding and kill pain in the mouth, throat, and nose. Schedule II also includes methamphetamine, because it is sometimes used to treat Attention-Deficit Hyperactivity Disorder (ADHD) and severe obesity.