is it okay to take two zyrtec in a 24 hour period?

my pharmacist said that i shouldnt do this, as well as the back saying take one every 24 hours, but after 15 [or so] hours from the first one, i felt the effects of allergies back. impulses had me take another. they’re 10 mg. i dont think [enphasis on 'think.'] it’s a big deal, but my anxiety feels the need to figure out for sure.
after reading the answers, i dont think i stated well enough that its said and done. i took it like 30 minutes before i posted this. just wondering whats going to happen now.

yes ,

ASTHMA / PANIC ATTACKS….ALLERGY – THE SIMPLE DRUG-FREE SOLUTION