Zyrtec vs Claritin: Which is more effective for allergies? - Drugs.com
https://www.drugs.com/medical-answers/zyrtec-claritin-difference-3122734/
The antihistamine effects of Zyrtec and Claritin last for at least 24 hours, therefore, they are both given once daily. Cetirizine, the active ingredient of Zyrtec works within one hour. Claritin may not reach its peak effect for two to three hours since most of its antihistamine activity is attributable to its active metabolite … See more
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