Posted 12/8/2011 1:12 PM (GMT -7)
Well, they are both antihistamines except Coricidin has acetaminophen as well as chlorpheniramine. While Allegra has fexofenadine with no acetaminophen. So it depends on which one you want to use and which one works better. If the Coricidin doesn't seem to be working well enough, try Allegra, if Allegra doesn't work that well, try Zyrtec. It's about trial and error.