TY - CHAP M1 - Book, Section TI - Cephalosporins A1 - Gruenberg, Katherine A1 - Guglielmo, B. Joseph A2 - Papadakis, Maxine A. A2 - McPhee, Stephen J. A2 - Rabow, Michael W. A2 - McQuaid, Kenneth R. PY - 2023 T2 - Current Medical Diagnosis & Treatment 2023 AB - The cephalosporins, structurally related to the penicillins, consist of a beta-lactam ring attached to a dihydrothiazoline ring. Substitutions of chemical groups result in varying pharmacologic properties and antimicrobial activities. Type 1 allergic cross-reactions between penicillins and cephalosporins are primarily due to similarities in the molecular structure of the R side chains; for example, penicillin and cefoxitin have similar R side chains; ampicillin and cephalexin share similar side chains. Consequently, a patient with a type 1 reaction to penicillin would be more likely to experience a similar reaction with cefoxitin when compared with cephalexin. In contrast, a patient with an allergic reaction to ampicillin would be more likely to have a reaction to cephalexin than cefoxitin. SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/04/19 UR - accessmedicine.mhmedical.com/content.aspx?aid=1193121979 ER -