Cyclobenzaprine is a drug.
Cyclobenzaprine , sold under the brand name Flexeril among others , is a muscle relaxer medication used to relieve skeletal muscle spasms and associated pain in acute musculoskeletal conditions . It has also been used off-label for fibromyalgia treatment . Off-label use is the use of pharmaceutical drugs for an unapproved indication or in an unapproved age group , dosage , or route of administration .