urticaria
"I have had hives my entire life.  I finally saw an allergist and he did tests.  He took me off of all medicines and put me on Xyzal.  I took the Xyzal three times and I have not had a hive since.  Seriously.  I had my first hives at 4 months and had hives everyday for forty six years.  I do not know what Xyzal did but it fixed me.  I stopped taking Claritin and Benadryl and Zyrtec.  Took Xyzal for three days.  It made me VERY sleepy.  I can't even take a normal Benadryl dose without falling asleep, though.  I had to take liquid Benadryl, one teaspoon, if I wanted to stay awake.  I slept twelve hours with my first dose of Xyzal and about 8 hours with the two successive doses.  Then, I never had a hive again."