Phentermine and Adderall are stimulant medications that affect the central nervous system but serve different purposes. Phentermine is approved for short-term weight loss, helping suppress appetite and boost energy. Adderall, containing amphetamine salts, is mainly prescribed for ADHD and narcolepsy to improve focus and alertness. While both can increase energy and reduce appetite, Adderall has a higher risk of dependence and misuse. Phentermine is preferred for weight management, whereas Adderall is intended for attention-related conditions. Neither should be used without medical supervision, as both can cause side effects like insomnia, anxiety, and elevated blood pressure.