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.
my husband has been getting charley horses in his feet legs and fingers. is this a side effect of potassium chloride?