http://www.medications.com/effect/view/41738 Wow! My husband and I have thought recently maybe I should stop using Zyrtec. Maybe it is causing my lethargy, weight gain, difficulty sleeping, inability to work for more than an hour doing anything, intense hunger. I have taken Zyrtec year round for se Wed, 26 Aug 2009 16:52:59 -0400 http://www.medications.com/effect/view/41738?item=22531 I absolutely agree with you! I am and have been having the same problems and I have stopped taking Zyrtec D as of Monday and my extreme need for food has gone as well as an increase in my energy. I just looked at this site today because I needed to verify http://www.medications.com/effect/view/41738?item=22531