allergic rhinitis
"I have seasonal allergies, I realized several years ago when I started getting headaches and got stuffy drinking beer and certain other foods/ drinks. So tried various medications but all had some side effects that limited my use. Cetirizine is now available as a generic. The trick with this drug is to take it at around 4-6 in the afternoon. It takes a while to work for me like the next day. By taking it in the early evening you miss the getting tired side effect which many have noted because it takes a while to react, and you are already relaxing after work/school/kids to bed, etc. By the next day it is in your system but your body can adjust to it. The best drug."