Adderall and caffeine are both stimulants that increase alertness and focus, but combining them can intensify side effects. Using both may cause jitteriness, rapid heartbeat, anxiety, high blood pressure, or sleep problems. While moderate caffeine intake is generally safe, pairing it with prescription Adderall can over-stimulate the nervous system. Doctors typically advise limiting coffee, energy drinks, or caffeine supplements when taking Adderall. Always follow medical guidance and never adjust your Adderall dosage to offset fatigue or focus issues. Safe use requires balance, hydration, and professional supervision.