I'm not sure what the difference is in either medications but I believe that it has something to do with the fact that Benedryl stops the histamine reaction all thru out the body while Claritin is mostly an allergic histamine reaction preventer - mainly used for seasonal allergies. Both are great antihistamines but I believe that Benedryl is better then Claritin for hives or body wide histamine reactions.
But that is a very good question and honestly I never really gave it much thought. Hmmm something to ask my doc about! :) Is there another antibiotic you can use to avoid this problem?
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