Commercial: Xyzal

Common side effects apparently are:

drowsiness, weakness;
tired feeling;
stuffy nose, sinus pain, sore throat, cough;
vomiting, diarrhea, constipation;
dry mouth; or.
weight gain.

And it can hurt your kidneys … still, they have a cool Owl anthro as a spokesperson.

(I’d probably stick with Claritin)