Den kliniske effekt af cetirizins farmakokinetik er aldrig blevet undersøgt hos børn med nedsat nyrefunktion, men indehaveren af markedsføringstilladelsen var enig i, at den aktuelle formulering ikke er helt korrekt, da patientens alder er vigtig, fordi den er afgørende for clearance.
For children with renal impairment, the clinical effects or the pharmacokinetics of cetirizine have never been tested but the MAH agreed that the current wording is not entirely correct since the age of the patient is important as it determines its clearance.