- Known history of hypersensitivity to cefadroxil (e.g. Duricel®) and/or related drugs in the family of cephalosporins (Cephalexin, Cefaclor, Cefazolin, Cefuroxime Axetil, Cefotetan, Cefprozil, Cefixime, Ceftriaxone), and/or penicillins (Amoxicillin, Ampicillin, Clozacillin).