Hi Amy!
Cefadroxil is from the cephalosporin category of antibiotics. Are the others that she is allergic to from that same category? For example Keflex? I think there are various categories, like the "mycins" and the "cillins". I'm only guessing but it might be interesting to see if all the ones she is now allergic to are from the same "group".
Maybe rxlist.com would be helpful (?)
I haven't ever heard of this being related to AA but lots of people are allergic (for example) to sulfa drugs and are fine with others.
Wendy B
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