<p>Use with caution in patients taking calcium channel blockers, diuretics, lithium treatment or other medications that might affect electrolyte levels as hyperphosphataemia, hypocalcaemia, hypokalae- mia, hypernatraemic dehydration and acidosis may occur. No other sodium phosphate preparations including sodium phosphate oral solution or tablets should be given concomitantly. As hypernatraemia is associated with lower lithium levels, concomitant use of this medicine and lithium therapy could lead to a fall in serum lithium levels with a lessening of effectiveness.</p>