I took zanaflex on and off for a couple of years. Originally, it made me groggy, then, it helped somewhat, then nothing. Another med which works best if a vacation from it is planned into treatment. Honestly, accidentally, I was prescribed valium to help me taper off of the Klonipin I had been taking but was afraid of due to dependency being a high risk, factor, and after a few days, taking it at bedtime I had less daily pain than I have had for decades. It was as good for the tense muscles and comcommitant pain as anything I've ever tried. Only problem is, my doc hesitates to prescribe much. At least I get some benefit from the nighttime dose.