Pain relievers are medications that help reduce or relive aches and pains, especially, headaches, sore muscles, arthritis etc. Pain relievers function with your cells, your body’s nerve endings, nervous system and your brain to keep you away from feeling the pain. This is just one part of the treatment plan. They temporarily lower the pain and, in some cases, completely eliminate the paining sensation. Generic pain reliver drugs are commonly found either in a nearby pharmacy or online.