Confidence votes 81. It cost about $500-$800 worth a year's supply of diapers for the first year.The next years may or may not cost more, the same, or less.
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 is the best-studied drug for this application. It has also been used off-label for fibromyalgia treatment.
Flexeril does not belong to the opioid family and is therefore not a narcotic agent. In the United States, Canada or internationally, Flexeril is not considered a controlled substance and should therefore not be considered a narcotic in any sense.