Soma is a muscle relaxer used to relieve muscle pain. Soma may also be used for purposes not listed in this medication guide. Somnolence (sleepiness) is the most common side effect of Soma, occurring in more than 20% of people taking this medication. Now you can buy Soma online for Arthritis and avail its 100% result-oriented benefits. Soma is one of the best medicines used for the treatment of muscle pain. It is a muscle relaxant that helps in reducing rigidity muscles.