Aztreonam-avibactam for the treatment of intra-abdominal infections

INTRODUCTION: Intra-abdominal infections are becoming increasingly common and can lead to significant morbidity and mortality. The incidence of these infections due to resistant gram-negative organisms is also increasing. Given this resistance, new antibiotic combinations are being developed, often utilizing older antibiotics and newer β-lactamase inhibitors. Aztreonam/avibactam (ATM-AVI) is one of the combination antibiotics, which combines aztreonam, a monobactam, with avibactam, a broad-spectrum β-lactamase inhibitor for the treatment of complicated intra-abdominal infections in combination with metronidazole. AREAS COVERED: In this drug evaluation manuscript, we provide an overview of intra-abdominal infections and an overview of currently available antimicrobial agents used to treat these infections. ATM-AVI is introduced, including chemistry, pharmacodynamics, pharmacokinetics and clinical studies of this compound. EXPERT OPINION: There are limited treatment options for complicated intra-abdominal infections due to resistant gram-negative organisms, especially those with metallo-β-lactamases. One treatment option for these infections is ATM-AVI, which was recently approved in Europe, in addition to metronidazole. These bacteria are difficult to treat, and this new compound is a safe and effective option for empiric treatment in places with a high incidence of infections due to these bacteria, and also treatment for infections when these resistant bacteria are isolated in culture.