Cefepime-d3 (BMY-28142-d3) sulfate is deuterium labeled Cefepime sulfate. Cefepime sulfate is a broad-spectrum, blood-brain barrier-permeable cephalosporin antibiotic with hPON1 inhibitory activity, with an IC50 of 21.115 mM and a Ki of 35.092 mM. Cefepime sulfate inhibits hPON1 via a non-competitive mechanism and blocks GABAA receptors. Cefepime sulfate penetrates the outer membrane of Gram-negative bacteria, inhibits the growth of Gram-positive and Gram-negative bacteria, and does not induce the production of beta-lactamase.