Man, I feel like this is a bit of a sales pitch... but, moreover just trying to help others save money.
If you take Zyrtec, and pay far too much ($20 for 27 pills, last time I looked) take a look at Costco.
Costco offers a generic version I have been using for nearly a year with 300 pills in one bottle for $15. Its called Aller-Tec. It works pretty much the same.
Yes, I realize this is a bit of an advertisement, but Zyrtec pricing is a scam.
I have year-around allergies, and its expensive as heck to pay for the actual stuff. Costco is a miracle.