Have been taking Quinine Sulfate off and on for several years for severe leg cramps. Am 86. Have had no discernible side effects. Should I have concern for future side effects. When taken nightly I have no leg cramps but when quitting for two three days they return. Do you offer any other solutions to Quinine other than hydration, magnesium/potassium or soap bars between the sheets at night? There seems to be some relationship between the leg cramps and emanation from the lower back. Have had stenosis and a successful back surgery and the cramps occurred several years prior.