muscle spasm
"I have been taking the generic form of Parafon Forte 500 mg since 1997 for my back, neck & leg spasms due to fibromyalgia, sciatica and neuropathy. It was not the first, second or even the fifth muscle relaxant I tried. None of the sodas, flexerils or amytripline, or NSAID type meds  made much difference. So  I did some online research and found this med to be the strongest muscle relaxer (as of '97 at least). I asked my pain management doc for this med.I am  still using it 18 years later. This is not a new medication"