Efficacy of Tirzepatide for Weight Management in Patients With Suboptimal Weight Loss After Bariatric Surgery: A Randomized, Double-Blind, Placebo-Controlled Clinical Trial

Brief summary

Many people who have bariatric (weight-loss) surgery do not lose as much weight as expected, or they regain weight over time. This study will test whether a medicine called tirzepatide can help these patients lose more weight and improve their overall health. Participants who had bariatric surgery at least one year ago and still have obesity with insufficient weight loss will be randomly assigned, like a coin flip, to receive either tirzepatide or a placebo (an inactive injection that looks the same). Neither participants nor study staff will know who is receiving which treatment. Participants will inject the study medicine or placebo once a week for 52 weeks, starting at a low dose that is gradually increased. During the study, researchers will measure body weight, waist size, blood pressure, and blood tests related to metabolism and inflammation. Participants will also answer questionnaires about their quality of life. The main goal is to find out whether tirzepatide leads to greater weight loss than placebo after one year of treatment.

Source: ClinicalTrials.gov (U.S. National Library of Medicine), data processed 2026-10-29T09:00:05; modifications: selected fields only; whitespace normalized; brief summary truncated to 2,000 characters. Not a U.S. Government endorsement.

Trial details

acronym

TirBaS

status

NOT_YET_RECRUITING

phase

PHASE3

study type

INTERVENTIONAL

enrollment

70

sponsor

Universidade do Porto

conditions

Obesity

interventions

DRUG: Tirzepatide; DRUG: Placebo

start date

2027-01-01

start date type

ESTIMATED

primary completion date

2028-12-01

has results

false

data source

ClinicalTrials.gov

data processed

2026-10-29T09:00:05

modifications

selected fields only; whitespace normalized; brief summary truncated to 2,000 characters