Pain O Soma 500mg is a muscle relaxant, for the relief of discomfort associated with acute, painful musculoskeletal conditions. Pain O Soma Tablet works by altering the signals from spinal cord and brain thus relaxing muscles. It blocks pain sensations between the nerves and the brain. Here are some mild side effects you may experience while using Pain O Soma 500mg tablets like Nausea, Headache, Sleepiness, Skin irritations etc.