I have never had trouble with allergies but on March 2nd I had 2 serious allergic reactions with my throat closing up and ended up having a total of 5 of them within 3 days.  My doctor put me on Xyzal samples he had and told me to take them until the samples ran out. Once they ran out, he said to get Zyrtec to take.  Would you believe that after taking Zyrtec for 3 days I had another serious reaction?  Well I’m now back on Xyzal and doing much better.  The only problem I’m having now is they still don’t know what causes the reactions and hopefully the specialist I’m going to now will figure it out.