Pain-O-Soma 500 mg is a muscle relaxer works to treat painful muscle and skeletal discomfort in adults like injury, accident, sprains, fractures, and overuse of particular muscles. Pain-O-Soma 500 mg tablet works to relieve pain sensations between the nerves and brain. Carisoprodol is the active ingredient of Pain-O-Soma tablets. Carisoprodol is a muscle relaxant. It blocks the pain signals communicated between the nervous system and the brain.