Likely nothing: Doses of up to 20 mg of zyrtec (cetirizine) per day for the treatment of urticaria, have been well studied. Taking 3 pills, or 30 mg, will likely just cause increased somnolence.
Answered 5/12/2021
4.3k views
Not toxic: But may make you drowsy and may over dry nasal passages.
Answered 11/5/2022
4.3k views
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