Comparing Ramosetron and Loperamide for treating Low Anterior Resection Syndrome

Safety & Efficacy of 5-HT3 Receptor Antagonist (Ramosetron) Versus Loperamide for the Treatment of Low Anterior Resection Syndrome (RALLARS): Multicenter Randomized Controlled Trial

Not applicable Interventional Seoul National University Hospital · NCT05577845

This study is testing whether Ramosetron or Loperamide works better to relieve symptoms for people dealing with Low Anterior Resection Syndrome after rectal cancer surgery.

Quick facts

PhaseNot applicable
Study typeInterventional
Enrollment212 (estimated)
Ages19 Years and up
SexAll
SponsorSeoul National University Hospital Academic / other
Locations1 site (Seoul, Jongro-gu)
Trial IDNCT05577845 on ClinicalTrials.gov

What this trial studies

This clinical trial evaluates the safety and efficacy of Ramosetron, a 5-HT3 receptor antagonist, compared to Loperamide for patients suffering from Low Anterior Resection Syndrome (LARS) following rectal cancer surgery. It is a multicenter randomized controlled trial aimed at determining which treatment provides better symptom relief for patients experiencing major LARS. Participants will be recruited from Seoul National University Hospital and will be monitored for their response to the interventions over a specified period post-surgery.

Who should consider this trial

Good fit: Ideal candidates for this study are patients with mid and low rectal cancer who have undergone surgery and are experiencing major LARS.

Not a fit: Patients with recurrent rectal cancer, stage IV cancer, inflammatory bowel disease, or uncontrolled preoperative fecal incontinence or constipation may not benefit from this study.

Why it matters

Potential benefit: If successful, this study could provide a more effective treatment option for patients suffering from LARS, improving their quality of life.

How similar studies have performed: While this approach is being tested in this specific context, similar studies using 5-HT3 receptor antagonists for gastrointestinal issues have shown promise.

Eligibility criteria

Show full inclusion / exclusion criteria
Inclusion Criteria:

* mid and low rectal cancer (AV\<15cm)
* stage II, III, preop long-course CCRT, then ileostomy repair
* about 1\~12 months after operation (no stomy)
* about 1\~6 months after ileostomy repair
* major LARS

Exclusion Criteria:

* recurred rectal cancer
* stage IV
* IBD
* uncontrolled preoperative fecal incontinence or constipation

Where this trial is running

Seoul, Jongro-gu

How to participate

  1. Review the eligibility criteria above with your treating physician.
  2. Visit the official trial page on ClinicalTrials.gov for the most current contact information and recruitment status.
  3. Contact the listed study coordinator or principal investigator to request pre-screening. Pre-screening is free and never obligates you to enroll.
Conditions LARS - Low Anterior Resection Syndrome
Last reviewed 2026-06-13 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.