this might sound stupid - i did this the other night, and my cramp went away - might of been coincidence The leg i had the cramp in, i stretched that one out, and the opposite arm above my head. Why? I dont know, i was half asleep, but, the cramp went away.
For me, the worst thing about them is getting them when you are asleep, cause all you want to do is get rid of them as quickly as possible, without having to go to to much effort and completely wake yourself back up again.
Oh, and i never checked with my obs about taking magnesium, i just started taking it. I did ask at the chemist thou, as also taking preg multivitamin, and wanted to ensure it was ok to take both together. Didnt want to overdose on the mag.