In patients with a history of severe penicillin allergy, how should cephalosporins be considered?

• A. Use with caution or choose alternatives in severe penicillin allergy.
• B. Cephalosporins should be completely avoided.
• C. Cephalosporins are ineffective in penicillin-allergic patients.
• D. Cephalosporins are always the first choice regardless of allergy.

Answer: (A)

Cross-reactivity risk exists between penicillins and cephalosporins because they are both beta-lactam antibiotics. In someone with a history of severe penicillin allergy, the safest approach is to use cephalosporins with caution or to choose an alternative antibiotic. The risk is not zero, especially with certain cephalosporins that have similar side chains to penicillins, and severe reactions (like anaphylaxis) call for avoiding cephalosporins unless there is a compelling reason and appropriate precautions are in place. If a cephalosporin is needed, consider one with a different side chain and monitor closely, ready to manage an allergic reaction.