Took zyrtec 6 hours go. i'm now dealing with nausea. can i take some benadryl to help with the nausea? just asking since i've taken the zyrtec.

Good that you asked: as you want to exercise caution with multiple medications, Zyrtec and Benadryl are both antihistamines with similar actions, combined together, you might get more of the side effects, you want to stay with only one of them. You can start with the lowest dose of Benadryl though and increase as needed, read the labels, if no improvement, see / call your doctor, avoid driving for now, wish you well