Pain O Soma 350 is the brand name for the muscle relaxant drug carisoprodol. It is used to treat pain and discomfort in muscles. People usually take it by mouth. For adults with muscle spasms, the normal dose is 350 mg by mouth three times a day and before bed for up to three weeks. Even though carisoprodol quickly eases muscle pain and soreness, it is only supposed to be used for a short time because it can be abused and cause side effects like sleepiness, headaches, and dizziness.