One thing I forgot to mention: For those who suffer from leg cramps (RLS) when sitting for long periods, my Dr. recommended drinking about 5 to 6 oz of tonic water. You get immediate relief! I take it with me when I travel and order it on planes. It is not very tasty, but it contains a small amount of quinine which does the job. You can't buy it in pill form in the US, but the Dr. said he could get me some out of Canada! But the Walmart brand (Mixer) is $0.98/liter and works fine. You can mix it with something else to make it more palatable, but I can drink it straight. I know it's meant to be used with alcoholic drinks, but if you're on pain meds, particularly those with acetameniphin included and want to keep your liver in decent shape, mix it with something else.