muscle spasm
"DON'T BASE YOUR PAIN CONTROL DECISIONS ON OTHER PEOPLES REVIEWS AND EXPERIENCES!  NOT EVERY MEDICATION WORKS FOR EVERYONE THE SAME WAY!
Cyclobenzaprine is generic Flexeril. I've been on it at two different times in my life and off it several years in between. It hasn't helped my musculoskeletal pain, muscle spasms, Charlie horses, arthritis, fibro, nothing. I did tend to get a headache about 45 minutes to an hour after taking it. With the unpredictability of pain and the added pain of the everyday variables of life (work, exercise, physical therapy, weather, a fall, flare up...) even the best pain meds may not give relief for weeks. So I do my best to force myself to try any med for a month, unless I have a negative reaction."