Anacin is an over-the-counter medication commonly used to relieve mild to moderate pain, such as headaches, muscle aches, and toothaches. It typically contains a combination of aspirin and caffeine, which work together to enhance pain relief. The aspirin component helps reduce inflammation and pain, while caffeine can improve the effectiveness of the pain reliever. Anacin is available in various forms, including tablets and caplets, and is often taken as needed. It is important to follow the recommended dosage instructions on the packaging to avoid potential side effects, such as stomach upset or increased risk of bleeding associated with aspirin.