Zyrtec (cetirizine): antihistamine OTC. The maximum recommended dose of Zyrtec (cetirizine) is 10mg per day. The interesting fact that studies have been shown that there is no advantage between 10 mg to the 20 mg dose of Zyrtec (cetirizine). Talk to your dermatologist for more information.Hope it helps.
Answered 6/11/2015
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