muscle spasm
"For low back pain since I had 2 protruding discs several years ago, I  take tramadol for pain and Skelaxin for muscle relaxing. It must be the name brand Skelaxin which works perfectly as the generic causes me to be foggy, loopy, and tired as the med wears off after 3 and a half hours. I also find I don't trust my driving or decision making on the generic. "