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New combo aims to melt fat, save muscle in obesity battle

NCT ID NCT05933499

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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study tests whether combining tirzepatide (a weight-loss drug) with bimagrumab (an experimental drug) helps people with obesity lose mostly fat while keeping muscle and bone. 63 adults will receive either the combo, tirzepatide alone, or bimagrumab alone for 52 weeks. The goal is to improve body composition and insulin sensitivity without the usual muscle loss seen with weight loss.

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 2

Tests whether the treatment actually works, and watches for side effects, in a larger group.

Participants

About 63 people

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

Started

Nov 2025

Expected to finish

Mar 2029

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 years and older

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: * BMI ≥30 kg/m2 or ≥27kg/m2 with at least one weight-related medical condition * Have a history of at least one self-reported unsuccessful behavioral effort to lose body weight * Have an established primary care provider Exclusion Criteria: * Current or prior history of diabetes mellitus based on self-report, use of diabetes medications, HbA1c ≥6.5%, or fasting glucose ≥126 mg/dL * Any single serum transaminase level (i.e., ALT, AST, alk phos) ≥3x the upper limit of normal (ULN) * Serum lipase and/or amylase levels ≥2x ULN * Serum bilirubin level \>1.6 mg/dL * Chronic kidney disease (e.g., estimated glomerular filtration rate (eGFR) \< 45 mL/min) * Total WBC \<3000/μL, neutrophils \<1500/μL, hemoglobin \<12 g/dL, or platelet count \<100,000/μL * Significant coagulopathy, e.g., PT/INR \>1.5 * History of familial hypertriglyceridemia or serum fasting triglyceride \>500 mg/dL * Uncontrolled thyroid disease, defined as abnormal TSH with abnormal fT4 * Any chronic active infection (e.g., HIV, hepatitis B or C) or hepatitis C treatment within the previous 6 months * Known history or presence of severe active acute or chronic liver disease (e.g., cirrhosis) or conditions with hepatotoxic potential (e.g., gallbladder or bile duct disease, acute or chronic pancreatitis, exocrine pancreatic insufficiency) * Active clinically significant gastric emptying abnormality or chronic use of a drug(s) that directly affect GI motility * History of calcium oxalate kidney stones * History of clinically significant arrhythmias, unstable angina, myocardial infarction, stroke, coronary artery bypass graft surgery, percutaneous coronary intervention, heart failure, valve disorders or defect, pulmonary hypertension, chronic hypotension (\<100/50), or chronic uncontrolled hypertension (\>160/100) * Tachycardia, defined as heart rate \>100 bpm after 5 minutes resting in a sitting position * History of malignancy of any organ system (other than localized squamous or basal cell carcinoma of the skin), treated or untreated, within the previous 5 years * Confirmed diagnosis of current, significant psychiatric disease (e.g., dementia, Alzheimer's disease, schizophrenia, or bipolar disorder). Individuals with adequately treated depression on stable treatment for at least 3 months are eligible. * Prior history of suicide attempt * PHQ-9 score ≥ 15 at screening * Personal or family history of multiple endocrine neoplasia 2A or 2B or medullary thyroid cancer * Active alcohol, drug, or tobacco abuse. For alcohol, an average weekly alcohol intake that exceeds 14 units per week (males) or 7 units per week (females) \[1 unit = 12 oz or 260 mL of beer; 5 oz or 150 mL of wine; 1.5 oz or 45 mL of distilled spirits\] is exclusionary. * Cannabis/THC use greater than once a week over the past three months and unwilling to abstain from use of cannabis/THC products for the duration of the study * Have obesity induced by other endocrinologic disorders (e.g., Cushing syndrome) or diagnosed monogenetic or syndromic forms of obesity (e.g., Melanocortin 4 Receptor deficiency or Prader Willi syndrome) * History of weight loss surgery or planned weight loss surgery during the trial period * Use of any anti-obesity medication, nutritional supplement, or over the counter (OTC) product for weight loss within the previous 6 months or during study participation * Any new dietary intervention or exercise regimen for weight loss started within the previous 3 months * Weight instability of \>5kg within the previous 3 months * Weight \> 150kg due to limitations of radiology imaging machines * Use of medications known or suspected to induce weight gain within the previous 3 months or during study participation (e.g., anti-androgens, gonadotropin releasing hormone (GnRH) analogs, some anticonvulsant and psychotropic medications (excluding anti-depressant medication) and oral glucocorticoids) * Use of skeletal muscle anabolic agents within the previous 3 months or during study participation (e.g., hormones such as growth hormone or testosterone, nutritional supplements (other than protein) and over-the-counter products labeled as muscle anabolic agents) * Treatment with glucose-lowering agent(s) within 90 days before screening * History of hypersensitivity to monoclonal antibodies or drugs in the same compound class as the study drugs * History of fragility fracture or BMD T-score ≤ -2.5 in participants \> 50 years old * Use of IV bisphosphonates within the previous 2 years or other osteoporosis medications within the previous 12 months or during study participation * Not able or willing to comply with dietary and lifestyle intervention for weight loss, including history of clinically significant condition that precludes regular walking for exercise or contraindication to following a 500-calorie daily deficit, high protein diet * Women who are pregnant or breastfeeding * Women of child-bearing potential, defined as women physiologically capable of becoming pregnant, unless they are using an intrauterine device (IUD) from at least 3 months before the baseline visit through at least 4 months after the last drug dose and an additional contraceptive (barrier) method from screening through at least 4 months after the last drug dose. Women not of child-bearing potential are defined as individuals who (1) have a congenital anomaly such as Mullerian agenesis, resulting in confirmed infertility, (2) are infertile due to surgical sterilization (defined as documented hysterectomy, bilateral salpingo-oophorectomy, bilateral salpingectomy, or bilateral oophorectomy), or (3) are post-menopausal. The following groups of women are eligible to participate: (a) women who are s/p surgical bilateral oophorectomy or total hysterectomy at least 6 weeks before taking study treatment, (b) women who have an IUD (see additional criteria above), (c) women who are s/p tubal ligation provided that they use an additional barrier form of contraception from screening through at least 4 months after the last drug dose, (d) women who are post-menopausal defined as ≥12 months of spontaneous amenorrhea with appropriate clinical and hormonal profile (e.g., age-appropriate, history of vasomotor symptoms, and/or FSH \>40 IU/L), (e) have a congenital anomaly resulting in confirmed infertility, and (f) do not have a history of sexual activity that could lead to pregnancy (i.e., total abstinence has been and is their preferred lifestyle or same-sex partners only). * For men, morning serum testosterone less than 200 ng/dL * Concurrently enrolled in any other type of medical research judged to be scientifically or medically incompatible with this study * Plans to move out of the study area within 16 months, or be out of the study area for \>4 weeks, continuously * Routine MRI exclusion * Donation or loss of 400 mL or more of blood within past 2 months or plasma donation (\> 250 mL) within past 2 weeks * Major surgery in the trial period * Any disorder, unwillingness, or inability not covered by any of the other exclusion criteria, which in the Investigator's opinion, might jeopardize the subject's safety or compliance with the protocol

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Conditions

The condition(s) this trial relates to.

As listed by the trial registrant

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

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

  • Massachusetts General Hospital

    RECRUITING

    Boston, Massachusetts, 02114, United States

More trials for these conditions

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