Can you take Claritin and Benadryl at the same time?

No, you do not take two antihistamines at the same time. You may choose either benadryl OR Claritin, but not both. Overdosing on antihistamines causes severe sedative effects which might make you become confused or pass out. You might have trouble breathing. You will get twice the drying out effects, and will almost certainly get a splitting sinus headache or nosebleed.