Introduction Caffeine is one of the most widely consumed stimulants in the world. Found naturally in coffee, tea, and chocolate—and added to sodas, energy drinks, and dietary supplements—it helps people stay alert, boost performance, and fight fatigue. However, caffeine is also a common ingredient in many over-the-counter (OTC) pain relievers, particularly those aimed at treating headaches, migraines, and menstrual cramps. While caffeine in moderation is generally safe, unintentional overconsumption can lead to serious health risks, especially when multiple sources are combined. A person who takes an OTC pain medication for a headache and later drinks an energy beverage or uses…