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Can Weight-Loss surgery change how medications work?

NCT ID NCT03519906

Knowledge-focused Sponsor: Norwegian University of Science and Technology Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
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
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Aug 13, 2026 · Last updated Aug 14, 2026 · Updated 1 time

Summary

This study investigates whether bariatric surgery, such as gastric bypass or sleeve gastrectomy, changes how the body absorbs the common blood-pressure medication metoprolol. Researchers will measure drug levels in the blood of 12 patients before and after surgery. The goal is to understand if surgery alters medication effectiveness, which could guide future dosing recommendations.

What this could mean

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

Active substance
metoprolol
What this could lead to
If successful, this could help doctors adjust medication doses for patients after bariatric surgery, ensuring treatments remain effective.
What could go wrong
This is a small, early-stage study with only 12 participants, so results may not apply to everyone. Individual variations in surgery and metabolism could limit the findings.

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.

Participants

About 12 people

The number the study aims to enrol. It can still change while the study runs.

Started

Nov 2016

Expected to finish

Oct 2026

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.

Who is studied

Patients referred for bariatric surgery (gastric bypass or sleeve gastrectomy)

Ages

18 to 70 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: * Preparing to undergo gastric bypass or sleeve gastrectomy in Central Norway * Being a Norwegian citizen Exclusion Criteria: * Having previously undergone resections in the GI-tract

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Conditions

The condition(s) this trial relates to.

morbid obesity obesity disorder

As listed by the trial registrant

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

Obesity, morbid

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • St. Olavs University Hospital

    RECRUITING

    Trondheim, Norway

More trials for these conditions

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