Pain o soma 500mg (carisoprodol) is commonly used as a muscle relaxant. The medicine works by preventing pain sensations from being transmitted between the brain and nerves. Pain relievers such as Soma 500mg are required, as well as rest and physical rehabilitation. Tapentadol, the main component in Aspadol 100 mg tablets, is a narcotic pain medication that is also used to treat all sorts of moderate to severe pain.