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Evaluation of the stability of temocillin in elastomeric infusion devices used for outpatient parenteral antimicrobial therapy in accordance with the requirements of the UK NHS Yellow Cover Document
  1. Fekade Bruck Sime1,
  2. Steven Wallis1,
  3. Conor Jamieson2,
  4. Tim Hills3,
  5. Mark Gilchrist4,
  6. Mark Santillo5,
  7. R Andrew Seaton6,
  8. Felicity Drummond7,
  9. Jason Roberts1,8,9,10
  10. on behalf of the BSAC Drug Stability Testing Programme
  1. 1 University of Queensland Centre for Clinical Research, Faculty of Medicine,the University of Queensland, Herston, Queensland, Australia
  2. 2 Pharmacy Department, Sandwell and West Birmingham Hospitals NHS Trust, Birmingham, West Midlands, UK
  3. 3 Pharmacy Department and OPAT Service, Nottingham University Hospitals, Nottingham, UK, Bristol, UK
  4. 4 Department of Pharmacy/Infection, Imperial College Healthcare NHS Trust, London, UK
  5. 5 Quality Assurance, University Hospitals Plymouth NHS Trust, Plymouth, UK and University Hospitals Bristol and Weston NHS Trust, Bristol, UK, Bristol, UK
  6. 6 Queen Elizabeth University Hospital, Glasgow, Glasgow, UK
  7. 7 British Society for Antimicrobial Chemotherapy, Birmingham, UK
  8. 8 Herston Infectious Diseases Institute (HeIDI), Metro North Health, Brisbane, Queensland, Australia
  9. 9 Departments of Pharmacy and Intensive Care Medicine, Royal Brisbane and Women’s Hospital, Brisbane, Queensland, Australia
  10. 10 Division of Anaesthesiology Critical Care Emergency and Pain Medicine, Nîmes University Hospital, University of Montpellier, Nîmes, France
  1. Correspondence to Dr Fekade Bruck Sime, The University of Queensland Centre for Clinical Research, Herston, QLD 4029, Australia; f.sime{at}


Objective To evaluate the stability of temocillin solution in two elastomeric infusion devices – Easypump II LT 270–27- S and Dosi-Fusor L25915-250D1 for OPAT administration during 14 days of 5°C±3°C fridge storage followed by 24 hour exposure at an in-use temperature of 32°C, when reconstituted with 0.3% citrate buffer at pH7.

Methods Stability testing was conducted in accordance with standard protocols in the UK National Health Service Yellow Cover Document (YCD). A stability indicating assay method was applied using a high-performance liquid chromatography (HPLC) system with a photodiode array detector. Low (500 mg/240 mL), intermediate (4000 mg/240 mL) and high (6000 mg/240 mL) temocillin concentrations were tested in triplicate devices with duplicate samples taken at 11 time points during fridge storage and subsequent in-use temperature exposure.

Result The percentage of temocillin remaining after 14 days of fridge storage was greater than 97% in both devices and at all concentrations tested. During subsequent in-use temperature exposure, a 95% stability limit was achieved for 12 hours except for the high concentration (25 mg/mL) in the Dosi-Fusor device. It met this criterion for only 10 hours — the percent of temocillin remaining at 12 hours was 94.5%. However, for all devices and the doses tested, the degradation of temocillin was <9% at the end of 24 hours in-use temperature exposure.

Conclusion Temocillin reconstituted with 0.3% citrate buffer at pH7 in elastomeric infusion devices can be stored in a fridge (2°C–8°C) for 14 days meeting the YCD acceptance criteria. Considering <5% degradation, the current data supports twice daily dosing of temocillin within the OPAT setting. In jurisdictions where a <10% degradation limit is acceptable, once daily dosing with 24-hour continuous infusion may be considered. Temocillin is a useful alternative to other broad-spectrum anti-Gram-negative agents currently utilised in the OPAT setting and supports the wider antimicrobial stewardship agenda.

  • Administration, Intravenous
  • Drug Monitoring
  • Drug Compounding
  • Quality Assurance, Health Care
  • Pharmacology

Data availability statement

Data are available upon reasonable request.

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