Symptoms started a few days after starting generic Zyrtec, which also caused unbelievable dryness that felt like I was dehydrated (no
vomiting, though). A day after the chills, I noticed my urine was dark
and my stools were very light, almost gray, and I started getting very itchy but no rash. Looked at the drug interactions monograph, thought it was a reaction to the generic Zyrtec and called my doc. He told me to stop taking the zyrtec and ordered liver function tests.