Proudly Serving Canadians Since 2012Cyclobenzaprine by PharmaScience is a muscle relaxant. You may know it by its market name Flexerilm as well. Cyclobenzaprine is primarily used short-term to alleviate muscle spasms and associated pain from sprains or strains. Often prescribed for a 10-day regimen alongside stretching and physical therapy. While providing relief, it can induce sedation.