Adderall 15mg is a prescription medication used primarily in the treatment of Attention-Deficit Hyperactivity Disorder (ADHD) and narcolepsy. Adderall 20 mg belongs to a class of medications called central nervous system (CNS) stimulants. Adderall 15mg dose represents a moderate-strength, immediate-release (IR) formulation of the drug, typically prescribed to individuals who have progressed from lower doses or require more sustained symptom relief.