Fexofenadine
"I have been taking Allegra for over a decade when it was only available on prescription.  Over the years my insurance company forced me to try all the allergy medicines that went OTC in hopes that they wouldn't have to continue to pay for Allegra by prescription.  However, nothing ever worked for me like Allegra.  The other drugs caused side effects that I could not tolerate.  I have no side-effects from Allegra what-so-ever.  It has been a miracle medication for me and my year-round allergies."