Just began taking zyrtec again today after a few months off, took adipex a couple of hours later now it feels as if my heart is racing a bit. i also take atenelol and pravastatin which i don't take until 10pm and I have taken advil today.I stopped taking zyrtec over the winter because i ran out and just didn't get more-at that time i started experiencing extensive itching- which lasted for several days-because of this, i didn't want to go back on. However, i have been sick for nearly 3 weeks with spring allergies and claritan wasn't helping.