Plain-English translation of NCT03843385 on ClinicalTrials.gov ↗ · Source last updated · Translation generated · How we translate trials
Read our Ulcerative Colitis research guide →Phase 3 — Testing in thousands of people, comparing the treatment against what doctors currently use. This is the last big step before approval.
This trial is testing whether a treatment called faecal microbiota filtrate (processed material from healthy donor stool) or faecal microbiota (whole donor stool material), delivered as frozen capsules you swallow, can help people with moderate ulcerative colitis feel better and heal their colon. The idea is based on research showing that people with ulcerative colitis have imbalances in their gut bacteria, and adding healthy bacteria from donors might restore balance and reduce inflammation.
Current treatments for ulcerative colitis don't work well enough for everyone, and some people's disease keeps coming back. This medication aims to address the root problem—an imbalance in gut bacteria—rather than just treating symptoms, offering hope for people whose disease hasn't responded to standard therapies.
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You will take 10 frozen capsules by mouth each day, 5 days a week (with 2 days off), for 12 weeks. The capsules contain either the new treatment, a comparison form of the treatment, or a placebo (inactive capsule). You'll need to have colonoscopies and blood work done to check if the treatment is working and to monitor for any side effects. The study team will track whether your symptoms improve and your colon heals over this 12-week period.
AI-generated summary from trial data · Jun 11, 2026 · Not medical advice
Germany