urticaria
"I have suffered from hives for over 30 years.  No medicine helped.  I had them for 3 years straight, 24/7.  My hives have come back about 4 different times, lasting up to a year.  I have been on Xyzal for about 2 months.  I take Benadryl, then an hour later I will take the  Xyzal.  I take Benadryl at bedtime.  This is the first time in the 30 years that I feel they are under control.  For anyone with chronic hives, its worth a shot.  I have no side effects as of yet.  They do not make me tired either."