Carisoprodol 350 mg is a muscle relaxer that blocks pain signals sent to your brain. Carisoprodol is available as a generic drug and as the brand-name drug Soma. It treats injuries and other painful conditions such as arthritis, carpal tunnel syndrome, and fibromyalgia. Carisoprodol 350 mg is available in tablet form. Carisoprodol should be used cautiously in older adults and people with liver or kidney disease. Carisoprodol is a medication that blocks pain signals from the brain to the nerves. It is a central nervous system (CNS) depressant that slows down the brain and nervous system activity.