muscle spasm
"I take Flexeril for muscle spasm related to bulged discs at L3-L4, L4-L5, and L5-S1.  I get sciatica down both legs.  I also have C6-C7 facet joint damage that catches and occasionally prevents me from turning my head to the left.  I am highly resistant to narcotics and anesthetics, and take 10mg Flexeril during the day without any side effects.  It allows me to function without letting the muscles lock up.  It stops the pain cycle (pain=muscle tension=pain=muscle tension).  When I take it at night, it quicly reduces the spasming.  If the pain is severe, I take with narcotics for one night to force massive relaxation.  This should be done with extreme caution tho - combining opiates and muscle relaxers can cause someone to stop breathing."