Cefotaxime-d3 is a stable isotope-labeled compound of Cefotaxime. Cefotaxime is a third-generation cephalosporin antibiotic with broad-spectrum antibacterial activity and is effective against a variety of Gram-positive and Gram-negative bacteria. Its primary mechanism of action is to achieve bactericidal effects by inhibiting bacterial cell wall synthesis. Due to its isotope-labeling properties, Cefotaxime-d3 is commonly used in pharmacokinetic studies, metabolism studies, and mass spectrometry analysis, helping scientists track the metabolic pathways and rates of the drug in vivo. The dose or concentration used in experiments typically depends on the experimental design and research objectives.