Ertapenem er effektivt stabilt over for hydrolyse af de fleste beta- lactamaseklasser, inklusiv penicillinaser, cefalosporinaser og udvidede spektrum beta - lactamaser, men ikke metallo- beta- lactamaser.
Ertapenem is effectively stable to hydrolysis by most classes of beta- lactamases, including penicillinases, cephalosporinases and extended spectrum beta-lactamases, but not metallo-beta-lactamases.