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Safety and PK of Ceftibuten-ledaborbactam Etzadroxil Fixed-dose Combination

A Phase 1, Open-label Study to Evaluate the Safety and to Characterize the Pharmacokinetics of a Fixed-Dose Combination Formulation of Ceftibuten-Ledaborbactam Etzadroxil

Who can join

Ages 18 to 55 · All sexes · Healthy volunteers welcome

Inclusion Criteria:

* Healthy adult male or female, between 18 and 55 years of age
* Body mass index ≥ 18 and ≤ 32 kg/m2
* Laboratory values meeting defined laboratory ranges
* Males or non-pregnant, non-lactating females

Exclusion Criteria:

* History of any hypersensitivity reaction following administration of a cephalosporin, penicillin, or other β-lactam antibacterial drug
* Any acute illness or surgery within the past 3 months determined by the investigator to be clinically relevant
* Positive alcohol, drug or tobacco use/test

About the study

This is a Phase 1, open-label, three-part, study in approximately 96 healthy adult participants between 18 and 55 years of age (both inclusive) (16 participants in Part 1, 20 participants in Part 2 and , and approximately 60 participants in Part 3). The study will be conducted at one clinical site in the United States. Participants in Part 1 and Part 2 may be conducted in parallel. The duration of an individual participation will be approximately 46 days for Part 1 , 43 days for Part 2 and 83 days for Part 3. All participants in Parts I und 2 will be screened within 28 days prior to dosing. All participants in Part 3 will be screened within 33 days prior to dosing. They will be admitted to the clinical research unit (CRU) the day prior to dosing and will remain in the CRU until the end of the PK sample collection period. All participants will return to the clinic for follow-up assessments 7 days ± 1 day after the last dose of study intervention. Participants in Part 3 will also return to the clinic for follow-up assessments 28 days ± 2 days and 42 days ± 2 days after the last dose of study intervention.

What is being tested

• Ledaborbactam etzadroxil (drug)
• Ceftibuten (drug)
• Ceftibuten-ledaborbactam etzadroxil (drug)
• Esomeprazole (drug)
• amoxicillin-clavulanate (drug)

Sponsor: Basilea Pharmaceutica · Participants: 96 · Started: Jan 7, 2025

Contact the study team

• Karine Litherland, PhD · Phone: +41616061111

Official record on ClinicalTrials.gov — NCT06733675

Locations in the U.S.

From ClinicalTrials.gov, data retrieved Sep 30, 2026. Each study sets its own eligibility; the study team decides who can join.