Check out this link: http://www.jigsawhealth.com/articles/allergies.html. I have had a lot of luck with their products. They are natural alternatives to prescription meds and I liked them because I never got strange/out of it feelings from them (like I did from Rx's from the doctor). There is a lot of other good info there for you to read as well. I hope this helps.
My son took Zyrtec also and I just now give him sometimes Claritin and sometimes Allevert and they both work wonderful. Better than spending $100.00
I think that claritin, loratadine is about the only one available right now. It is very affordable in the generic form. My husband takes it and does very well with it as long as he takes it every day as prescribed. May take 2 weeks to build up in your system. Best wishes to you.