<prompt> Digitalis toxicity can cause:HyperkalemiaNauseaArrhythmiasAll of the above  <response>: Ref:KDT 6e p498 Some early warning signs of overdose are confusion, loss of appetite, nausea, vomiting, diarrhea, or vision problems. Othersigns of overdose are changes in the rate or rhythm of the heabeat becoming irregular or slow, palpitations feeling of pounding in the chest, or fainting. 