<p>Excessive administration of potassium leads to development of hyperkalaemia, the symptoms of which include paraesthesia of the extremitis, muscle weakness, paralysis, hypotension, cardiac arrhythmias, heart block and cardiac arrest. Pain or phlebitis may occur during I.V. administration of solutions containing about 30 mmol or more potassium per litre. Nausea, vomiting, diarrhoea and abdominal cramps may occur following oral administration.</p>