In Singapore, there is an increasing trend of treating patients who respond favourably to initial antimicrobial therapy in the outpatient setting (Fisher, et.al, 2006). Ertapenem is one of several agents with excellent antimicrobial activity against Enterobactericae (including ESBL producers). In view of its safety profile and its viability in elastromeric pump, it has great potential to be used in OPAT patients.