Probably ok: Zyrtec syrup and Claritin syrup are for children, so 5mL of syrup is 5mg (half the dose of an adult pill). Zyrtec pills are 10mg, and one a day is the usual dose. An adult taking 20mg should still be fine. Taking 30mL is 30mg, and probably will not create any unusual side effects in an adult... except maybe a bit of drowsiness. Should consider waiting another 24 hours before taking the next 10mg.
Answered 8/11/2020
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