I took one tablet of Zyrtec before bed for 3 nights and had an adverse event by the 4th day. I became very highly agitated, in a very very bad black mood, and all around extremely pissed at everything and everyone. My mother noticed the abrupt change in my personality and behavior, which is normally nice and normal. For instance, I left my car to pump gas and was so agitated I furiously slammed my car door behind me. I got pissed at people at the store, etc... This stuff shouldn't be sold over the counter if it can cause these... read full review »