I am 71 years of age and i hd open heart bypass surgery for eight bypasses, along with the replacement of two heart valves, and i had a pacemaker and defibilator implanted in my chest.i am on carvedilol, furesomide, lisinipril, pravastatin, asprin and potassium chloride oral solution but i am concerned about taking the potassium chloride every day because it is a poision i think, what should i do.