Cyclobenzaprine is a medication used to treat muscle spasms, stiffness, and discomfort caused by strains, sprains, or injuries to muscles. It belongs to a group of medications called skeletal muscle relaxants and works by acting in the brain and nervous system to allow the muscles to relax. Cyclobenzaprine is usually taken with rest, physical therapy, and other measures. It comes in the form of a tablet and an extended-release capsule to take by mouth. The tablet is usually taken with or without food three times a day, while the extended-release capsule is usually taken with or without food once a day. It is important to follow the directions on the prescription label carefully, and not to take this drug for more than 3 weeks without talking to a doctor. Cyclobenzaprine is not recommended for use in the elderly. It is also important to tell a doctor if taking monoamine oxidase (MAO) inhibitors or other medications, as they may interact with cyclobenzaprine. Some common brand names of cyclobenzaprine include Fexmid and Flexeril.