Which of the following beta-lactam antibiotics can be safely used in a patient with a history of allergy to penicillins?: (A) Aztreonam, (B) Cefepime, (C) Loracarbef, (D) Ceftriaxone
Answer is A. Ans. (A) Aztreonam(Ref: KDT 8/e p781)Aztreonam is the only beta lactam antibiotic that can be used in patients having severe allergy to penicillins or cephalosporins (as it is not cross allergenic).