Cyclobenzaprine
muscle spasm
"Perfect for severe up upper back muscle pain and spasms.  I could barely stand by the end of a typical work day. Flexeril has made it possible to work and be more comfortable and able to enjoy life.  Only side effects I've noticed is slight irritability, dry mouth, and only drowsiness when taken in a large dose or at the end of the day.  

Dosage is 10mg x 3 times daily.   Usually one on my first work break, then 2 on my last break.  Typically takes 1.5 hours to 2 hours to kick in so the timing is perfect.   Able to enjoy life again, besides being stuck in be all the time."