Allegra, or fenofexadine in generic form, is a second-generation antihistamine that just became available over-the-counter early in 2011. It happens to be my antihistamine of choice, and for many other allergy sufferers as well. It doesn't make you drowsy, and when taken as directed, it can provide extraordinarily effective control over bothersome allergy symptoms.
I've taken Allegra off an on for years (couldn't always get it when it was still a prescription medication). But I have to admit, I just recently learned of the problem with its effectiveness when taken with fruit juice.