Typical malarial doses of quinine considerably exceed the content of grocery-shop tonic water, and it had been proposed for cramps by my physician, and appears to work very well. Tinnitus seems to be an issue, for me in any case, which may/will drive me nutso In a nutshell buy. Tonic https://blndwater.com/products/blnd-lemon-and-mint-tonic-water-250ml