Potassium supplements stop the shakes and seizures in arms and upper body and charlie horse in the legs. I had a stomache staple at 16. 27 years ago. one side effect is the crawlies and the shakes then seizures the potassium helps stop them when they start as soon as I take them. but I take 99mg about 5-7 tablets depending on when it starts or I try to take twice a day sometimes I have to tke 4-7 times a day to help if i had any caffiene. which i try not to have. there is risks but to stop the this it is worth it.good side effects no high blood pressure no depression.the chemical in brain which controls this is potassium based. bad side effects if to much straight thru you like interstinal flu.so watch how much you take.