I took my Zyrtec at 11 a.m. and it is nearing 2 p.m. I'm still sneezing and feel miserable, and am taking the afternoon off from work. Sigh...
Autumn, please, please come soon!!!
Zyrtec is very effective, but look for it's generic equivalent: Cetirizine Hydrochloride. On Amazon.com you can usually buy a 90 day supply for right at $6.20 delivered. I'm still using last summer's bottle.
Don't get taken in on the marketing, the generics do the job and are the same medicine.