Flexabenz is used for Ache Musculoskeletal aches and pains Osteoarthritis pain Back pain Pain Delayed onset muscle soreness Muscle strains Pain disorders Muscle or joint pain Pain in shoulder joint and other conditions Flexabenz may also be used for purposes not listed in this medication guide Flexabenz contains Cyclobenzaprine Topical Diclofenac Topical Menthol Topical and Methyl Salicylate Topical as Active ingredients Flexabenz works by healing the pain disorders decreasing the prostaglandin synthesis reducing pain and delayed onset muscle soreness providing relief of musculoskeletal aches and pains