I have been taking Lasix for the last couple of months to combat the swelling in my feet and legs that other medications have caused. I take the corresponding amounts of potassium supplements needed to counter act a potassium deficiency, which water pills can cause. At 40mg a day I don't seem to have any adverse reactions, but when I have to take the 60mg or 80mg I start to get cramp-like pains in the arches of my feet. I know that a potassium deficiency can cause cramps, but I don't want to OD on potassium because that can cause arrhythmia... any I don't need any more health problems. Any suggestions?