05 Nov 2026

Note on use of antimicrobial agents with Anaerobic coverage:

Antimicrobial drugs with anaerobic activity:

  • Amoxicillin-clavulanate
  • Ampicillin-sulbactam
  • Cefoperazone-sulbactam
  • Clindamycin*
  • Doripenem
  • Ertapenem
  • Imipenem
  • Meropenem
  • Metronidazole
  • Piperacillin-tazobactam
  • Ticarcillin-clavulanate
  • Tigecycline

Points to consider while using antimicrobial agents with anaerobic activity:

  • The combined use of two antimicrobials with anaerobic cover mentioned above is unnecessary and should be avoided to prevent additional toxicity.
  • Exceptions to (1) are:
    • Clostridioides difficile infection
    • Amoebic colitis or Amoebic liver abscess

*- Clindamycin:

Not active against Gram –negative anaerobes, so should not be used for infections where Gram-negative anaerobes are suspected (eg: intra-abdominal infections)

References

1. Implementation of Antibiotic Stewardship Core Elements at Small and Critical Access Hospitals. Centers for Disease Control and Prevention, www.cdc.gov/antibiotic- use/healthcare/implementation/core-elements-small-critical.html.
2. Core Elements of Hospital Antibiotic Stewardship Programs. Centers for Disease Control and Prevention, www.cdc.gov/antibiotic-use/healthcare/implementation/core-elements.html
3. Huttner B, Jones M, Rubin MA, et al. Double trouble: how big a problem is redundant anaerobic antibiotic coverage in Veterans Affairs medical centers. J Antimicrob Chemother. 2012;67(6):1537-9.