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The combination of aspirin and caffeine in a tablet is a popular over-the-counter medication commonly used for the relief of pain, fever, and mild to moderate headaches. Aspirin, a nonsteroidal anti-inflammatory drug (NSAID), works by reducing inflammation and blocking the production of certain chemicals in the body that cause pain and fever. Caffeine, a central nervous system stimulant, is added to the formulation to enhance the analgesic effect of aspirin and improve the medication's effectiveness in alleviating headache symptoms. Together, these ingredients provide a potent combination for managing various types of headaches, including tension headaches and migraines.