muscle spasm
"In the last 10 years I have had 6 back surgeries. Several just Lamenectomies and 3 adding hardware and artificial disc replacement. I have many diagnosis including degenerative disc disease, narrowing of the spine, radiculapathy, failed back syndrome, etc, etc. I find when my muscles are relaxed I experience less pain since my spine isn't being contracted and less nerves are being pinched. This muscle relaxer worked GREAT had much less need for the narcotic pain medicines."