Taking potassium chloride together with digoxin can increase the risk of hyperkalaemia, which means too much potassium in the blood. Other medicines that raise this risk include angiotensin-converting enzyme inhibitors, cyclosporin, NSAIDs, beta-blockers, heparin and potassium-sparing diuretics.
These medicines are often taken together with some care. Your doctor may change a dose, space them apart or check on you more often. Make sure your doctor and pharmacist know you take both.