Phentermine and Adderall are prescription medications sometimes used for weight management and ADHD, but they differ in purpose, mechanism, and safety. Phentermine is primarily a short-term appetite suppressant for weight loss, while Adderall is a stimulant commonly prescribed to manage ADHD symptoms by increasing focus and attention. Both affect the central nervous system and can cause side effects like increased heart rate, insomnia, or anxiety. Adderall may also be used off-label for weight loss, but this is not its main indication. Healthcare providers carefully evaluate patient needs, medical history, and potential risks before prescribing either medication.