In response to the inquiry from Mexico: For what it may be worth, at one time when I was having leg cramps, I was told to get Quinine Sulfate 5 grains over the counter at a pharmacy. I took it as needed, once a day, as I recall. The need was short-lived in my case. You would surely want to check with your doctor before trying it. It would be nice if this simple remedy helped. Lucile Wright [log in to unmask]