I do fulfirnox also. I had cramping of mouth muscles (jaw) and cramping of hands during oxaliplten infusion on chemo days. My Dr lowered my oxaliplaten to 50% and i also now get iv 2 gm of calcium and iv 2 gm of magnesium b4 and after the oxaliplaten and I also get benedryll b4 the oxaliplaten. This has helped.