 [ Symptoms ] my husband has been getting charley horses in his feet legs and fingers is this a side effect of potassium chloride [ Disease ] muscle cramps and charley horses are usually symptoms of not having enough potassium or other minerals in your bloodstream they are not usually a side effect of potassium supplements you should discuss this with his doctor he may not be on a high enough dose or he may need a different type of supplement it could be from diuretic meds speak to your doctor