muscle spasm
"Have used this for sciatic pain and muscle tightening, for 50 years now, about once every five years or so.  Love it.  Let's me sleep.  Methocarbamol, heating pad and rest for about 3 days -- and back to normal life again.  No side effects.  I am highly allergic to all paid medicines except for Aleve.  This is a life saver for me."