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Careful administration: Studies conducted with healthy volunteers at doses of 20 and 25mg/day have not revealed effects on alertness or reaction time, however, patients are advised not to exceed the recommended dose if driving or operating machinery.
Others: It has been reported that Cetirizine hydrochloride could be used up to 20mg under doctor or pharmacist's order if there are no improvements of symptoms with usual dose of 10mg a day.
