Clinical trial Recruiting at 1 site Phase 4 Interventional Ages 18 and up

Meropenem versus piperacillin/tazobactam for adults with sepsis

Official title: Empirical Meropenem Versus Piperacillin/Tazobactam for Adult Patients With Sepsis (EMPRESS) Trial

Run by Scandinavian Critical Care Trials Group · NCT06184659 · Data updated 2026-11-12

This trial will test whether meropenem or piperacillin/tazobactam works better and safer as the first antibiotic for critically ill adults with sepsis.

Quick facts

PhasePhase 4
Study typeInterventional
Ages18 Years and up
SexAll
Enrollment5800 (estimated)
SponsorScandinavian Critical Care Trials Group
Academic / other
Locations2 sites (Copenhagen, København Ø and 1 other locations)
StatusRecruiting
StartedJune 26, 2025
Main results expectedJune 30, 2028
Study endsMarch 30, 2029
Registry record updatedJuly 3, 2025
Trial IDNCT06184659 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Adults (≥18 years) who are critically ill with sepsis or septic shock by Sepsis-3 criteria, require intensive support such as mechanical ventilation, high-flow oxygen/CPAP, or continuous vasopressors, and for whom clinicians intend empirical treatment with meropenem or piperacillin/tazobactam are ideal candidates.

Probably not a fit

Patients who have already had more than 24 hours of intravenous meropenem or piperacillin/tazobactam, pregnant women or those with contraindications to either drug, and less severely ill patients not requiring intensive organ support are unlikely to benefit from participating.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

EMPRESS is an international, investigator-initiated, randomized, open-label adaptive trial comparing empirical meropenem with piperacillin/tazobactam in critically ill adults meeting Sepsis-3 criteria. It uses response-adaptive randomisation and adaptive stopping rules with an integrated feasibility phase to make the trial more likely to reach clear conclusions and to increase patients' chances of receiving the better-performing antibiotic. The primary focus is on mortality and other patient-important outcomes during critical care, with participants enrolled when clinicians plan empirical treatment with either study antibiotic. The trial excludes patients who have already received these antibiotics intravenously for more than 24 hours and other standard contraindications.

Why it matters

Potential benefit: If successful, the trial could identify which antibiotic reduces deaths and complications in critically ill sepsis patients and guide safer initial antibiotic choices.

How similar studies have gone: Previous systematic reviews suggested possible worse outcomes with piperacillin/tazobactam in severe infections but the evidence was low or very low certainty, so conclusive comparisons are still lacking.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

* Age ≥ 18 years
* Sepsis (including septic shock) defined according to the Sepsis-3 criteria (1), i.e., suspected or documented infection and an acute increase of ≥ 2 points in the Sequential Organ Failure Assessment (SOFA) score (a marker of acute organ dysfunction)
* Critical illness defined as use of at least one of the following:

  1. Invasive mechanical ventilation
  2. Non-invasive ventilation
  3. Continuous use of continuous positive airway pressure (CPAP) for hypoxia
  4. Oxygen supplementation with an oxygen flow of ≥ 10 litres (L)/minute independent of delivery system and total flows
  5. Continuous infusion of any vasopressor or inotrope (excluding strictly procedure-related infusions)
* Clinical indication for empirical treatment with either meropenem or piperacillin/tazobactam

Exclusion Criteria:

* Preceding intravenous treatment with meropenem or piperacillin/tazobactam for \> 24 hours prior to screening
* Fertile women \< 60 years of age with known pregnancy or positive urine human gonadotropin (hCG) or plasma hCG
* Known hypersensitivity or allergy to beta-lactam antibiotics
* Suspected or documented central nervous system infection
* Known infection/colonialization with microorganism with acquired resistance against meropenem or piperacillin/tazobactam within the previous 3 months (e.g., ESBL-, AmpC- or carbapenemase-producing bacteria)
* Current or planned use of valproate within 30 days from randomisation
* Patient included in another interventional trial where co-enrolment with EMPRESS is not permitted
* Previously randomised into the EMPRESS trial
* Informed consent following inclusion expected to be unobtainable
* Patient under coercive measures

Where it's running

  • Rigshospitalet
    Copenhagen, Denmark
    Recruiting
  • Rigshospitalet
    Copenhagen, København Ø, Denmark
    Not yet recruiting

Study contacts

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.