I also suffered leg cramps, and even heart-muscle cramps that landed me in the ICU more than once. Used quinine, too, with the results you report. However, since I take lots of calcium supplement (thyroid removed years ago) one doctor suggested I add magnesium and zinc, to balance my minerals. My potassium is always naturally high. Adding one cal, mag, zinc supplement, one magnesium and one zinc pill a day, I've had not one cramp and have been free of the heart "attacks" that confounded heart specialists since the first episode in 1984. My heart specialist says he hadn't heard of that before, but most certainly I should continue what is working so well for me. He also reminded me that the heart is a muscle and therefore subject to adverse affects from deficiencies or imbalances in MINERALS ~~ especially potassium, calcium, magnesium, zinc Ask your doctor about mineral supplements. Good luck.