What is Flexeril and Why is it Addictive? Flexeril is a muscle relaxant, often used to help with pain, but is less addictive than other painkillers on the market. Cyclobenzaprine, the active compound in Flexeril, is found in different products in various formulations. The drug is addictive when used for chronic pain support because it … Continue reading What is Flexeril and Why is it Addictive?