I have have had problems mainly with my lower extremeites, but i will get the shoulder one during the day sometimes and the glutes to but mainly during the day and not night. I take zanaflex, which helps, i try to take the least amt i can get by with that will help, it will make you sleepy
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I take a whole one at night and i get no spasms, maybe a shoulder one here and there, but for the most part no spasms and i sleeep better. Hope this helps, i may try the magnesium myslef and see what that does..