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Intravenous amoxicillin-sulbactam against Escherichia coli: optimizing the dose, component ratio and infusion time

C Bantar1, L Fernandez Canigia, M A Berger

  • 1Laboratorio Domingo I Nanni (Paraná), Hospital Alemán, Buenos Aires, Argentina. cbantar@arnet.com.ar

Journal of Chemotherapy (Florence, Italy)
|July 2, 2009
PubMed

Insights

The optimal amoxicillin-sulbactam (AMX-SUL) formulation for treating E. coli infections is 1g/1g, especially when infused over 3 hours. Extended infusion enhances AMX-SUL

Area of Science:

  • Pharmacology
  • Microbiology
  • Infectious Diseases

Background:

  • Amoxicillin-sulbactam (AMX-SUL) is an antibiotic combination used for intra-abdominal infections.
  • Optimizing AMX-SUL dosage and ratio is crucial for effective treatment against resistant bacteria like Escherichia coli.

Purpose of the Study:

  • To determine the optimal dose and ratio of amoxicillin-sulbactam (AMX-SUL) components.
  • To evaluate the ex-vivo pharmacodynamic activity of AMX-SUL against Escherichia coli using a human pharmacodynamic model.

Main Methods:

  • Four volunteers received single doses of AMX-SUL with varying ratios (1/0.5, 1/1, 2/0.5 g/g) and infusion times (30 min or 3h).
  • Time-kill studies were conducted using post-dosing sera against two strains of E. coli with different susceptibility profiles.
  • Minimum Inhibitory Concentrations (MICs) for amoxicillin (AMX) and AMX-SUL were determined for each E. coli strain.

Main Results:

  • The 1g/1g ratio infused over 3 hours demonstrated superior and prolonged antimicrobial activity against both E. coli strains compared to other ratios and infusion times.
  • Extended 3-hour infusion of AMX-SUL (1g/1g and 1g/0.5g) significantly improved its pharmacodynamic profile.
  • AMX-SUL 1g/1g infused over 3 hours showed sustained bactericidal activity up to 4 hours post-dose against E. coli ATCC 25922.

Conclusions:

  • The 1g/1g formulation of amoxicillin-sulbactam is suggested as the optimal ratio for treating E. coli infections.
  • Extended infusion over 3 hours enhances the pharmacodynamic activity of AMX-SUL, making it more effective.
  • Clinical trials are recommended to validate the efficacy of extended-infusion AMX-SUL for community-acquired intra-abdominal infections.

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