hypokalemia
"I use this to prevent muscle cramps so severe that I have thought I would tear muscles lose.  I take 2 tablets each day along with 3 x 600mg calcium citrate with Vitamin D caplets.  Sometimes I have to take an additional Klor-con 20 if I am passing a lot of urine.  I take Lasix 40 mg a day, I was taking 80 mg and I would get cramps within 6 hours of taking it.  I had been using Quinine previously, but it was taken off the market."