Adderall is used to treat attention deficit hyperactivity disorder (ADHD) and narcolepsy. The effects can be positive when taken as intended but dangerous if you use it without medical supervision. The effects of the medication can be positive when Adderall is taken as intended, but for people who may use the drug without medical supervision, the effects can be dangerous. Adderall is often prescribed for both ADHD and narcolepsy because these conditions are associated Trusted Source with a dysfunction of these neurotransmitters in the brain. Adderall’s effects on the central nervous system can be positive. You may feel more awake during the day and become more focused and calm.