Recent Updates
Recently added Catalysts

TBP-PI-HBr

Phase 3

Urinary Tract Infection | Small molecule | Infectious Disease |Spero Therapeutics, Inc.|Last Updated: Mar 10, 2026

Success Probability
Subscribe to view
Market & Valuation
Subscribe to view
Trial Design
RandomizedDouble-BlindACTIVE_CONTROLLEDDMC
Total Trials1
Total Enrollment1,690
FDA Designations
No designations recorded
Clinical trial landscape

TBP-PI-HBr · 3 trials · 4 indications

Phase 3 1Phase 1 2
NCT06059846A Study of Oral Tebipenem Pivoxil Hydrobromide (TBP-PI-HBr) Compared to Intravenous Imipenem-cilastatin in Participants With Complicated Urinary Tract Infection (cUTI) or Acute Pyelonephritis (AP)Urinary Tract Infection
COMPLETED1,690 Analytics
PHASE3COMPLETED
A Study of Oral Tebipenem Pivoxil Hydrobromide (TBP-PI-HBr) Compared to Intravenous Imipenem-cilastatin in Participants With Complicated Urinary Tract Infection (cUTI) or Acute Pyelonephritis (AP)
Urinary Tract InfectionUnlock trial analytics
Study Endpoints
Primary Endpoints
Number of Participants With Overall Response at the Test-of-Cure (TOC) Visit in the Microbiological Intent-to-Treat (Micro-ITT) Population
At Day 17 (TOC)

Overall response includes combined clinical cure plus microbiological eradication. Clinical cure is defined as a complete resolution or significant improvement of signs and symptoms of cUTI or AP present at baseline and no new symptoms, such that no further antibacterial therapy is warranted, and participant is alive. Microbiological eradication (favorable microbiological response) is defined as a reduction of baseline uropathogens to \<10\^3 CFU/mL and negative repeated blood culture if blood culture was positive for uropathogen growth at baseline and participant is alive.

Part A and B: Maximum Observed Concentration (Cmax) of TBP in Plasma and Blood
Cohort 1: Pre-dose and at multiple timepoints post-dose up to Day 3; Cohort 2: Pre-dose and at multiple timepoints post-dose up to Day 5; Cohort 3: pre-dose and at multiple timepoints post-dose up to Day 7
Part A and B: Time to Cmax (Tmax) of TBP in Plasma and Blood
Cohort 1: Pre-dose and at multiple timepoints post-dose up to Day 3; Cohort 2: Pre-dose and at multiple timepoints post-dose up to Day 5; Cohort 3: pre-dose and at multiple timepoints post-dose up to Day 7
Part A and B: Area Under the Concentration-Time Curve (AUC) Extrapolated to Infinity [AUC(0-inf)] of TBP in Plasma and Blood
Cohort 1: Pre-dose and at multiple timepoints post-dose up to Day 3; Cohort 2: Pre-dose and at multiple timepoints post-dose up to Day 5; Cohort 3: pre-dose and at multiple timepoints post-dose up to Day 7
Part A and B: AUC From Time Zero to the Time of the Last Evaluable Concentration [AUC(0-t)] of TBP in Plasma and Blood
Cohort 1: Pre-dose and at multiple timepoints post-dose up to Day 3; Cohort 2: Pre-dose and at multiple timepoints post-dose up to Day 5; Cohort 3: pre-dose and at multiple timepoints post-dose up to Day 7
Part A and B: Amount Excreted in Urine (Ae) of TBP
Cohort 1: Pre-dose and at multiple timepoints post-dose up to Day 3; Cohort 2: Pre-dose and at multiple timepoints post-dose up to Day 5; Cohort 3: pre-dose and at multiple timepoints post-dose up to Day 7
Part A and B: Fraction of Dose Excreted in Urine (Fe) of TBP
Cohort 1: Pre-dose and at multiple timepoints post-dose up to Day 3; Cohort 2: Pre-dose and at multiple timepoints post-dose up to Day 5; Cohort 3: pre-dose and at multiple timepoints post-dose up to Day 7
Part B: AUC From Time Zero to 6 Hours Post-dose AUC(0-6) of TBP in Plasma and Blood
Pre-dose and at multiple timepoints post-dose up to Day 7
Part B: Ae of SPR1349
Pre-dose and at multiple timepoints post-dose up to Day 7
Part B: Fe of SPR1349
Pre-dose and at multiple timepoints post-dose up to Day 7
Percentage of Tebipenem (TBP) Samples With Converted (From Whole Blood Measurements) and Measured Plasma Concentrations That Have a Difference not Exceeding ±20% of the Mean of the Concentrations
Pre dose and at multiple time points post dose on Day 1
Area Under the Plasma Concentration-time Curve Extrapolated to Infinity (AUC0-∞) of TBP
Pre dose and at multiple time points post dose on Day 1
Maximum Plasma Concentration (Cmax) of TBP
Pre dose and at multiple time points post dose on Day 1
Secondary Endpoints
Number of Participants With Overall Response (Combined Per-Participant Clinical Cure and Favorable Microbiological Response) at the TOC Visit in the Microbiologically Evaluable (ME) Population
At Day 17 (TOC)
Number of Participants With Overall Response at the End-of-Treatment (EOT) and Late Follow-Up (LFU) Visits in the Micro-ITT Population
At Day 10 (EOT) and Day 28 (LFU)
Number of Participants With Overall Response at EOT and LFU Visits in the ME Population
At Day 10 (EOT) and Day 28 (LFU)
Unlock Study Endpoints
Study Design & Arms
AllocationRANDOMIZED
MaskingTRIPLE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
TBP-PI-HBrEXPERIMENTALParticipants received TBP-PI-HBr 600 milligrams (mg), two x 300mg film-coated tablets, orally (PO) and a dummy infusion intravenously (IV), every 6 hours (q6h) from Day 1 through Day 10. Participants with estimated baseline creatinine clearance (CrCl) greater than (\>) 30 millilitres per minute (mL/min) and less than or equal to (≤) 50 mL/min received TBP-PI-HBr 300 mg q6h.
Imipenem-cilastatinACTIVE_COMPARATORParticipants received imipenem-cilastatin 500 mg, IV and matched dummy tablets, PO, q6h from Day 1 through Day 10. Dose adjustments for imipenem-cilastatin were made for participants with estimated baseline CrCl less than (\<) 90mL/min per approved imipenem-cilastatin package insert. Participants with baseline CrCl levels greater than or equal to (≥) 60 to \< 90 mL/min were administered imipenem-cilastatin, 400 mg IV q6h and participants with baseline CrCl levels \>30 to \<60 mL/min, were administered 300mg IV, q6h.
Part A: Cohort 1EXPERIMENTALParticipants will receive TBP-PI-HBr, 900 milligrams (mg) tablets orally, as a single dose under fasted condition on Day 1.
Part A: Cohort 2 (Fasted/Fed)EXPERIMENTALParticipants will receive TBP-PI-HBr, 1200 mg, tablets, orally, as a single dose under fasted and fed conditions on Day 1 and Day 3, as per the assigned crossover sequence.
Part B: Cohort 3EXPERIMENTALParticipants will receive TBP-PI-HBr, 600 mg, orally as a single dose on Day 1, followed by 9 doses every 6 hours from Day 3 through Day 5. (first and ninth dose will be given under fasted conditions).
TBP-PI-HBr 600 mgEXPERIMENTALHealthy participants meeting eligibility criteria will receive a single oral dose of TBP-PI-HBr 600 mg tablets (2 x 300 mg) on Day 1 under fasted conditions.
Interventions
NameTypeDescription
TBP-PI-HBrDRUGTBP-PI-HBr film-coated immediate-release tablets.
Imipenem-cilastatinDRUGSterile powder for reconstitution administered as IV.
Dummy InfusionDRUG0.9% sodium chloride administered as IV infusion.
Dummy TabletsDRUGTBP-PI-HBr matching dummy tablets.
Unlock Study Design Details
Eligibility Criteria
Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites85

Inclusion Criteria: 1. Have a diagnosis of cUTI or AP. 2. Have an adequate urine specimen for evaluation and culture obtained within 24 hours prior to randomization with evidence of pyuria that includes at least one of the following: 1. at least 10 white blood cells (WBCs) per high power field ...

Countries:United StatesArgentinaBosnia and HerzegovinaBrazilBulgariaCroatiaEstoniaGeorgiaGreeceHungaryIndiaLatviaMoldovaPolandRomaniaSerbiaSlovakiaSouth AfricaTurkey (Türkiye)
Unlock Eligibility Criteria
Competitive Landscape -Urinary Tract Infections 5 trials (matched to "Urinary Tract Infection")
Recent Changes (Last 90 Days)
MEDIUMMay 21, 2026NCT06059846TRIAL_REMOVED: changed
MEDIUMMay 21, 2026NCT06059846TRIAL_REMOVED: changed