Notes: Cefpodoxime-d3 is intended for use as an internal standard for the quantification of cefpodoxime (Item No. 16075) by GC- or LC-MS. Cefpodoxime is a metabolite of cefpodoxime proxetil, a third generation cephalosporin antibiotic, that is active against both Gram-positive and Gram-negative bacteria (MIC90s = 0.015-8 µg/ml).{26281}