how long does it take for cyclobenzaprine to work

Cyclobenzaprine generally starts working within 20 to 60 minutes after taking it. Immediate-release forms typically begin to provide relief within about 30 minutes, with peak effects around 4 hours. Extended-release formulations take longer to work and reach peak effectiveness around 7 to 8 hours after taking the dose. The muscle relaxation effect is felt when muscles start to feel more relaxed and stiffness or spasms ease. Some people also notice mild drowsiness or a sense of calm as a sign that the medication is active. Factors such as metabolism, age, liver function, food intake, and other medications can affect how quickly cyclobenzaprine takes effect.