Completed

A Comparison of Fidaxomicin and Oral Vancomycin for the Treatment of Clostridium Difficile Infection (CDI) in Hospitalized Patients Receiving Concomitant Antibiotics for the Treatment of Concurrent Systemic Infections

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What is being tested

Fidaxomicin

+ Vancomycin

Drug
Who is being recruted

Bacterial Infections and Mycoses+6

+ Bacterial Infections

+ Clostridium Infections

Over 18 Years
See all eligibility criteria
How is the trial designed

Treatment Study

Phase 4
Interventional
Study Start: May 2017
See protocol details

Summary

Principal SponsorUniversity of Michigan
Last updated: January 28, 2026
Sourced from a government-validated database.Claim as a partner

Study start date: May 1, 2017

Actual date on which the first participant was enrolled.

Administration of concomitant antibiotics (CA) is a known risk factor for treatment failure in the treatment of CDI, as well as for recurrence of CDI. Recent data suggested that among patients receiving CA, fidaxomicin is superior to vancomycin. While these data are encouraging, many clinicians remain unclear on how to apply these data to patient care. Additionally, patients were excluded from the trials presented to the FDA if it was expected that they would require ≥ 7 days of CA. Therefore, the clinical question still remains of how to apply these data to the real world patient who requires a long course of CA and develops CDI while on therapy. We therefore propose an open label, comparative and prospective study of fidaxomicin 200 mg twice daily vs oral vancomycin 125 mg four times daily for the treatment of CDI among patients who are receiving a long course of CA. We hypothesize that fidaxomicin will be superior to vancomycin with respect to clinical cure for patients with CDI.

Official TitleA Comparison of Fidaxomicin and Oral Vancomycin for the Treatment of Clostridium Difficile Infection (CDI) in Hospitalized Patients Receiving Concomitant Antibiotics for the Treatment of Concurrent Systemic Infections
NCT02692651
Principal SponsorUniversity of Michigan
Last updated: January 28, 2026
Sourced from a government-validated database.Claim as a partner

Protocol

This section provides details of the study plan, including how the study is designed and what the study is measuring.
Design Details

144 patients to be enrolled

Total number of participants that the clinical trial aims to recruit.

Treatment Study

These studies test new ways to treat a disease, condition, or health issue. The goal is to see if a new drug, therapy, or approach works better or has fewer side effects than existing options.


Eligibility

Researchers look for people who fit a certain description, called eligibility criteria: person's general health condition or prior treatments.
Conditions
Criteria

Any sex

Biological sex of participants that are eligible to enroll.

Over 18 Years

Range of ages for which participants are eligible to join.

Healthy volunteers not allowed

If individuals who are healthy and do not have the condition being studied can participate.

Conditions

Pathology

Bacterial Infections and MycosesBacterial InfectionsClostridium InfectionsDiarrheaInfectionsSigns and SymptomsSigns and Symptoms, DigestivePathological Conditions, Signs and SymptomsGram-Positive Bacterial Infections

Criteria

Inclusion Criteria: * Patients 18 years of age or older with \>3 unformed stools/24 hours with positive stool test for C. difficile. * Patients receiving ≥ 1 high or medium risk antibiotic for treatment of an infection other than CDI, for an anticipated duration of ≥ 5 days from the time of enrollment. * High risk: carbapenems, 2nd-4th generation cephalosporins, fluoroquinolones, clindamycin, and beta-lactam/beta-lactamase inhibitor combinations * Medium risk: 1st generation cephalosporin, macrolides\*, and aztreonam * \*The macrolide would be considered to be low risk if patients are receiving intermittent macrolides for prophylaxis only and not for treatment of an acute infection Exclusion Criteria: * Patients with severe-complicated disease that would compromise oral therapy (hypotenstion or shock, ileus or bowel obstruction, megacolon). * Patients with an allergy to oral vancomycin or fidaxomicin. * Patients anticipated to receive metronidazole after enrollment. * Patients who already received oral vancomycin or metronidazole (either oral or intravenous) for \> 24 hours within the preceding 72 hours at the time of enrollment. * Patients anticipated to receive adjunctive C. difficile therapy (rifaxamin, nitazoxanide, tigecycline) after enrollment. * Patients who are on laxatives before they are enrolled into the study, such as lactulose, if: * Patients have had a recent dose adjustment; * Baseline number of bowel movement while on laxatives is unknown. * Number of bowel movements and/or consistency has not changed from baseline. * Patients who have had colostomy or ileostomy * Patients who will have colostomy or ileostomy after enrollment and before study ends * Patients who are or will be on long-term (\>12 weeks) medium or high-risk antibiotics prophylaxis after enrollment

Study Plan

Find out more about all the medication administered in this study, their detailed description and what they involve.
Treatment Groups
Study Objectives

2 intervention groups are designated in this study

This study does not include a placebo group 

Treatment Groups

Group I

Active Comparator
Fidaxomicin 200 mg PO BID for 10 days or until the end of the duration of concomitant antibiotic exposure, whichever is longer.

Group II

Active Comparator
Vancomycin 125 mg PO QID for 10 days or until the end of the duration of concomitant antibiotic exposure, whichever is longer.

Study Objectives

Primary Objectives

Secondary Objectives

Study Centers

These are the hospitals, clinics, or research facilities where the trial is being conducted. You can find the location closest to you and its status.

This study has 2 locations

Suspended

University of Michigan

Ann Arbor, United StatesOpen University of Michigan in Google Maps
Suspended

St. Joseph Mercy Hospital

Ypsilanti, United States
Completed2 Study Centers