Over here there are 'only' three prescription muscle relaxant's available, although Diazepam could be used off label to treat it. But their choice is restricted to these three.
Baclofen, Tizanidine and Tolperisol. Tolperisone in English!
That last one i never heard of, just out off curiosity. Is it of any use, in other word's is it re creative? according to Wikipedia its central acting. Could be used as a backbone of a RC if so. And seeing the un-willingness of dr's these day's to prescribe anything useful, RC's are a necessity. Sad but true.
https://en.wikipedia.org/wiki/Tolperisone
And there is dihydro-Kinine OTC, does that even work?