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New drug could ease CF constipation in just 4 weeks

NCT ID NCT06810167

Symptom relief Sponsor: Massachusetts General Hospital Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing This study
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 27, 2026 · Last updated Aug 21, 2026 · Updated 1 time

Summary

This study tests whether tenapanor, a drug already approved for irritable bowel syndrome with constipation, can help people with cystic fibrosis who have constipation. Twenty-five adults will take a 50 mg tablet twice daily for 4 weeks and track their bowel movements and symptoms through questionnaires and diaries. The goal is to see if the drug increases spontaneous bowel movements and improves quality of life.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
Tenapanor
What this could lead to
If it works, this could offer a new treatment option for constipation in people with cystic fibrosis, improving bowel regularity and quality of life.
What could go wrong
This is a small, early-phase study with only 25 participants and no placebo group, so results may not apply broadly. Tenapanor is already approved for IBS-C but has not been tested in CF patients before.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Phase 3

Large-scale testing in a bigger group. Usually the last step before a treatment can be approved.

Participants

25 people

The number who actually took part.

Started

Jun 2025

Expected to finish

Jun 2027

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 to 75 years

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: 1. Having confirmed cystic fibrosis (either by sweat chloride or genetic testing) 2. Meeting criteria for CFrC Must include 2 of the following, with or without abdominal pain for at least 3 months, with symptom onset at least 6-months prior: * Straining in at least 25% of defecations * Bristol Stool Scale 1-2 more than 25% of defecations (change in stool form) * Sensation of incomplete evacuation more than 25% of defecations * Sensation of anorectal obstruction/blockage more than 25% of defecations * Manual disimpaction/manipulation of pelvic floor to facilitate more than 25% of defecations * Fewer than 3 spontaneous bowel movements weekly (change in stool frequency) * Loose stools rarely present without the use of laxatives 3. Willingness to avoid major dietary or lifestyle changes during study. Exclusion Criteria: 1. Use of any antibiotic to treat infection within the 4-weeks prior to study initiation (stable azithromycin dosed 3-times weekly for lung function is to be allowed) 2. Inability to discontinue standing bowel regimen (including fiber, stool softener, as well as either osmotic or stimulant laxative, pro-kinetic serotonergic agents, or other therapy) 2-weeks prior to study drug initiation (with ability to use osmotic laxative therapy as rescue therapy only). 3. Severe CFrC as determined by study team 4. Prior tenapanor usage 5. Hospitalization within 4-weeks prior to study initiation. 6. DIOS within 4-weeks prior to study initiation. 7. Other known/suspected mechanical obstruction

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Conditions

The condition(s) this trial relates to.

constipation disorder cystic fibrosis

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Constipation Cystic fibrosis

Contacts and locations

Locations

  • Massachusetts General Hospital

    Boston, Massachusetts, 02114, United States

More trials for these conditions

Other studies related to the condition(s) this trial covers.