muscle spasm
"I have back pain due to slipping on slippery ice. Doc gave me cyclobenzaprine but first I couldn't sleep and I was feeling my limbs numb and kind of cold, then I was waking up the whole night like every 2 hours, when I reached my wake up time everything has been feeling as if I'm in slow motion and it was only 1 tablet! I don't think I'll keep going with it."