aztreonam
Regulatory sources consulted
Approved indications
- Infections caused by susceptible aerobic gram-negative bacilli, including urinary, respiratory, intra-abdominal, gynecologic, skin, osteoarticular infections, septicemia, and gonorrhea.
Contraindications
Absolute
- Hypersensitivity to aztreonam.
Clinical warnings
- Major warning · Severe hypersensitivity or anaphylaxis may occur; review beta-lactam allergy history and discontinue if an allergic reaction develops. — CIMA/AEMPS, ficha técnica 57781
- Major warning · Clostridioides difficile-associated diarrhea and colitis may occur during or after treatment; assess significant diarrhea. — CIMA/AEMPS, ficha técnica 57781
- Major warning · Confusion, encephalopathy, and seizures have been reported, especially with renal impairment or unadjusted doses; adjust for renal function and monitor neurologic status. — CIMA/AEMPS, ficha técnica 57781
Drug interactions
- HighOral anticoagulants
Mechanism: It may enhance the anticoagulant effect.
Recommendation: Monitor INR and signs of bleeding.
CIMA/AEMPS, ficha técnica 57781
Adverse events
Common (≥1%)
Nausea, diarrhea, and rash
Rare but serious
Anaphylaxis, C. difficile colitis, and severe cytopenias
Pregnancy and lactation
During pregnancy, use only when clinically indicated. Assess breastfeeding according to milk exposure and the infant’s condition described in the product information.
Recent literature (PubMed)
There is a need for additional therapeutic options for serious infections caused by Gram-negative pathogens. In the phase 3, descriptive REVISIT study, we investigated the safety and efficacy of aztreonam-avibactam in the treatment of complicated intra-abdominal infections or hospital-acquired pneumonia or ventilator-associated pneumonia (HAP-VAP) caused, or suspected to be caused, by Gram-negative bacteria. This prospective, multinational, open-label, central assessor-masked study enrolled adults who were hospitalised with a complicated intra-abdominal infection or HAP-VAP. Patients were randomly allocated via block randomisation using interactive response technology stratified by infection type in a 2:1 ratio to aztreonam-avibactam (with metronidazole for complicated intra-abdominal infection) or meropenem with or without colistin for 5-14 days for complicated intra-abdominal infection or 7-14 days for HAP-VAP. The primary endpoint was clinical cure at the test-of-cure visit (within 3 days before or after day 28) in the intention-to-treat (ITT) population. Secondary endpoints included 28-day mortality in the ITT population and safety in patients in the ITT population who received study drug (safety analysis set). No formal hypothesis testing was planned. The study was registered with ClinicalTrials.gov (NCT03329092) and EudraCT (2017-002742-68) and is complete. Between April 5, 2018, and Feb 23, 2023, we screened 461 patients. 422 patients were enrolled and randomly allocated (282 in the aztreonam-avibactam group and 140 in the meropenem group, forming the ITT analysis set), of whom ten patients (seven in the aztreonam-avibactam group and three in the meropenem group) were randomly allocated but did not receive study treatment. 271 (64%) of 422 patients had at least one Gram-negative pathogen from an adequate specimen identified at baseline. The most frequent baseline pathogens were Enterobacterales (252 [93%] of 271). Overall, 19 (24%) of 80 isolates tested for c
The increase in nosocomial infections by beta-lactamase producing Gram-negative bacilli constitutes a therapeutic challenge. The combination of ceftazidime-avibactam offers a very interesting therapeutic option for nosocomial pneumonia caused by extended-spectrum beta-lactamase-producing Klebsiella pneumoniae, multidrug-resistant Pseudomonas aeruginosa, and other enterobacteria. Compared to carbapenems, ceftazidime-avibactam has demonstrated non-inferiority in the treatment of nosocomial pneumonia including better clinical and microbiological cure rates and mortality compared to colistin. The limitation of ceftazidime-avibactam in the treatment of infections caused by metallo-beta-lactamase-producing Enterobacteriaceae can be overcome with the addition of aztreonam.
Antimicrobial resistance poses a significant public health challenge, particularly with the rise of gram-negative hospital-acquired infections resistant to carbapenems. Aztreonam-avibactam (ATM-AVI) is a promising new combination therapy designed to combat multidrug-resistant (MDR) gram-negative bacteria, including those producing metallo-β-lactamases (MBLs). Aztreonam, a monobactam antibiotic, is resistant to hydrolysis by MBLs but can be degraded by other β-lactamases. Avibactam, a novel non-β-lactam β-lactamase inhibitor, effectively neutralizes extended-spectrum β-lactamases (ESBLs) and AmpC β-lactamases, restoring aztreonam's efficacy against resistant pathogens. This review covers the chemistry, mechanisms of action, spectrum of activity, pharmacokinetics, pharmacodynamics, and clinical efficacy of ATM-AVI. ATM-AVI combination has shown efficacy against a wide range of resistant Enterobacterales and other gram-negative bacteria in both in vitro and clinical studies. Pharmacokinetic and pharmacodynamic analyses demonstrate that ATM-AVI maintains effective drug concentrations in the body, with dose adjustments recommended for patients with renal impairment. Clinical trials, including the REVISIT and ASSEMBLE studies, have demonstrated the safety and efficacy of ATM-AVI in treating complicated intra-abdominal infections (cIAI), urinary tract infections (UTIs), and hospital-acquired pneumonia (HAP) caused by MDR gram-negative pathogens. The European Medicines Agency (EMA) has approved ATM-AVI for these indications, and further research is ongoing to optimize dosing regimens and expand its clinical use. This combination represents a critical advancement in the fight against antimicrobial resistance, offering a new therapeutic option for treating severe infections caused by MDR gram-negative, including MBL-producing, bacteria.
Ceftobiprole is a cephalosporin that may be effective for treating complicated Staphylococcus aureus bacteremia, including methicillin-resistant S. aureus. In this phase 3, double-blind, double-dummy, noninferiority trial, adults with complicated S. aureus bacteremia were randomly assigned in a 1:1 ratio to receive ceftobiprole at a dose of 500 mg intravenously every 6 hours for 8 days and every 8 hours thereafter, or daptomycin at a dose of 6 to 10 mg per kilogram of body weight intravenously every 24 hours plus optional aztreonam (at the discretion of the trial-site investigators). The primary outcome, overall treatment success 70 days after randomization (defined as survival, bacteremia clearance, symptom improvement, no new S. aureus bacteremia-related complications, and no receipt of other potentially effective antibiotics), with a noninferiority margin of 15%, was adjudicated by a data review committee whose members were unaware of the trial-group assignments. Safety was also assessed. Of 390 patients who underwent randomization, 387 (189 in the ceftobiprole group and 198 in the daptomycin group) had confirmed S. aureus bacteremia and received ceftobiprole or daptomycin (modified intention-to-treat population). A total of 132 of 189 patients (69.8%) in the ceftobiprole group and 136 of 198 patients (68.7%) in the daptomycin group had overall treatment success (adjusted difference, 2.0 percentage points; 95% confidence interval [CI], -7.1 to 11.1). Findings appeared to be consistent between the ceftobiprole and daptomycin groups in key subgroups and with respect to secondary outcomes, including mortality (9.0% and 9.1%, respectively; 95% CI, -6.2 to 5.2) and the percentage of patients with microbiologic eradication (82.0% and 77.3%; 95% CI, -2.9 to 13.0). Adverse events were reported in 121 of 191 patients (63.4%) who received ceftobiprole and 117 of 198 patients (59.1%) who received daptomycin; serious adverse events were reported in 36 patients (18.8%) and 45