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Oral rifaximin in patients with opioid use disorder (OUD): multicenter clinical trial on the microbiota–gut–brain axis

Status
Withdrawn
Phases
Phase 2
Study type
Interventional
Source
EU CTIS
Registry ID
CTIS2025-524778-41-00
Enrollment
50
Registered
2026-04-29
Start date
Unknown
Completion date
Unknown
Last updated
2026-04-29

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

substance use disorder

Brief summary

The primary efficacy endpoints concern the improvement of craving and social disconnection/isolation in OUD paties treated with rifaximin compared with placebo. Specifically: Intensity of opioid craving, Indicators of social isolation/disconnection, Tapering of methadone therapy

Detailed description

Improvement in: Intestinal permeability measures, Fecal microbiota characteristics, Adverse events and infections

Interventions

DRUGNormix 200 mg compresse rivestite con film
DRUGThe placebo is a film-coated oral tablet designed to be comparable in appearance
DRUGand handling to the investigational medicinal product (rifaximin 200 mg film-coated tablets)
DRUGwhile containing no active pharmaceutical ingredient. The placebo consists exclusively of commonly used pharmaceutical excipients with established safety profiles and is administered solely to maintain blinding in the clinical trial.

Sponsors

Fondazione Santa Lucia
Lead SponsorOTHER

Eligibility

Sex/Gender
All
Age
18 Years to 64 Years

Design outcomes

Primary

MeasureTime frame
The primary efficacy endpoints concern the improvement of craving and social disconnection/isolation in OUD paties treated with rifaximin compared with placebo. Specifically: Intensity of opioid craving, Indicators of social isolation/disconnection, Tapering of methadone therapy

Secondary

MeasureTime frame
Improvement in: Intestinal permeability measures, Fecal microbiota characteristics, Adverse events and infections

Outcome results

None listed

Source: EU CTIS · Data processed: Apr 30, 2026