Cat Allergies Treatment

My boyfriend and I are house sitting for some friends and I have pretty bad cat allergies. For the past several years I’ve taken benadryl around my friend’s cats which works out okay, but I’m never around them for more than a few hours….

I will be spending the night in a house with cats and I want to know for allergies (itchy eyes, really itchy skin, sometimes hives) what kind of medicine would be most effective.