text: sun exposure warnings with zyrtec? i have broken out with a rash that may be sun poisoning. i was only out in the sun for an hour today around 10 am.  i have been on zytec for several months and never experienced this problem.  any ideas? once i got a prescription filled for zyrtec and there was a sticker on it about sun exposure. i asked the dr. and he said he hadn't heard anything about it. but i guess there is something to it.