Allergy and Asthma Care
Zyrtec can cause drowsiness but is highly effective and you only need to take one a day.
Benadryl is going to make you sleepy but can be a good pre-bed boost for allergy suffers with the added benefit of getting you to drift off.
Loratadine won't make you fall asleep while speaking to your wife but it is not as strong and might want to be shored up with a Benadryl before bed.
Always ask your doctor (even when the insurance company has taken your coverage away for having allergies) before taking anything, nobody wants to be the dumb dumb in the ER after all.