allergic rhinitis
"My kids and I have taken Zyrtec for years. It has worked wonderfully for us all BUT. . . It wasn't until my most recent migraine that I realized Zyrtec was making us deathly ill. It dawned on me that my migraines occurred once a month right when we ran out of Zyrtec. The horrible  migraines were withdrawal symptoms!  I immediately stopped giving it to my kids and taking it myself. Yes nose started dripping and I have little hives on my arm but OMG I haven't felt this good in YEARS. No joke, since all 4 of have stopped taking it we've all lost weight. I've lost about 7-10 lbs in a month. My kid's clothes are almost too big. My head is CLEAR, no fog, no drowsy, groggy feeling. I feel like myself again. Do not take Zyrtec!"