Which carbapenem does NOT cover Pseudomonas?

Ertapenem is the carbapenem that does not provide coverage against Pseudomonas aeruginosa. This is particularly noteworthy because, among the carbapenems, it has a more limited spectrum of activity compared to the others like Meropenem and Imipenem, which are effective against Pseudomonas.

Ertapenem is primarily used for treating infections caused by Escherichia coli, Klebsiella pneumoniae, and certain anaerobes, but its lack of efficacy against Pseudomonas makes it less versatile in cases where Pseudomonas is a potential pathogen. This specificity can guide clinicians when selecting antibiotics, ensuring the proper choice is made based on the suspected or known pathogens involved in an infection.