Over-the-counter (OTC) pain relievers are medications available without a prescription that help alleviate mild to moderate pain. Common types include acetaminophen, ibuprofen, and naproxen. These medications can be used for various conditions, such as headaches, muscle aches, and arthritis. OTC pain relievers work by reducing inflammation or blocking pain signals in the brain. While generally safe when used as directed, it's important to follow dosage instructions and be aware of potential side effects. Individuals should consult a healthcare professional if they have underlying health conditions or are taking other medications.