My 2.5 year old son was on this for a little over a week. We noti...

My 2.5 year old son was on this for a little over a week. We noticed him start to have rapid eye blinking and head twitching every other minute or so. Took him to ER, doctors said possible pink eye even though there was no redness or discharge in his eyes. Followed up with his pediatrician and was told no pink eye but possible reaction to Zyrtec and to discontinue the med. Also advised that it takes up to 6 weeks for medicines to be completely out of the system. Pediatrician is also scheduling appointment with neurologist in case this "tic" doesn't go away in a reasonable amount of time. I wish I'd known about this site and others prior to giving my son this medicine recommended by a doctor. There should be a warning label on every bottle of medicine both prescribed and otc to direct people to websites such as these or a 1-800 number to advise about any and all potential side effects.