New pill aims to stop muscle loss during Weight-Loss drug boom
NCT ID NCT06282458
First seen Jun 26, 2026 · Last updated Jun 26, 2026
Summary
This completed Phase 2 trial tested whether enobosarm, an experimental oral drug, can prevent muscle loss in older adults (aged 60+) who are taking GLP-1 receptor agonists like Wegovy for chronic weight management. The study enrolled 168 participants and measured changes in lean body mass and fat mass over 112 days. The goal is to help people lose fat while keeping or building muscle, improving strength and physical function.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- enobosarm (a selective androgen receptor modulator, SARM)
- What this could lead to
- If it works, enobosarm could help people on weight-loss drugs like Wegovy preserve muscle while losing fat, improving overall body composition and physical function.
- What could go wrong
- This is an early Phase 2 study with only 168 participants, so results may not apply to everyone. Enobosarm is still experimental and its long-term safety is unknown.
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
-
168 people
The number who actually took part.
- Started
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Apr 2024
- Finished
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Aug 2025
- Lead sponsor
-
A company
The lead sponsor is a pharmaceutical, biotech, or medical-device company.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
-
60 to 100 years
- Sex
-
Anyone
- Healthy volunteers
-
Accepted
You do not need to have the condition being studied to take part.
Show the full entry requirements Hide 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: Subjects accepted for this study must: 1. Provide informed consent from the subject or the subject's legally authorized representative 2. Be able to communicate effectively with the study personnel 3. Aged ≥60 years 4. For Female Subjects * Menopausal status * Be postmenopausal as defined by either: * one year or more of amenorrhea * surgical menopause with bilateral oophorectomy For Male Subjects * Subject must agree to use acceptable methods of contraception: * If the study subject's partner could become pregnant, use acceptable methods of contraception from the time of the first administration of study medication until 30 days following administration of the last dose of study medication. Acceptable methods of contraception are as follows: surgical sterilization (vasectomy with documentation of azoospermia) and a barrier method {condom used with spermicidal foam/gel/film/cream/suppository}, the female partner uses oral contraceptives (combination estrogen/progesterone pills), injectable progesterone or subdermal implants and a barrier method (condom used with spermicidal foam/gel/film/cream/suppository) * If female partner of a study subject has undergone documented tubal ligation (female sterilization), a barrier method (condom used with spermicidal foam/gel/film/cream/suppository) should also be used * If female partner of a study subject has undergone documented placement of an intrauterine device (IUD) or intrauterine system (IUS), a barrier method (condom with spermicidal foam/gel/film/cream/suppository) should also be used * Female partner is menopausal as defined above 5. Documented evidence of obesity (BMI ≥30 or ≥27 with the presence of at least one weight-related comorbid condition (e.g., hypertension, type 2 diabetes mellitus, or dyslipidemia) 6. Medically indicated for use of GLP-1 receptor agonist for weight management. 7. Consents to be treated with GLP-1 receptor agonist for 84 days under this protocol. 8. Subject is willing to comply with the requirements of the protocol through the end of the study 9. The patient is able to swallow oral medications 10. The patient is able to complete the physical function (stair climb) assessment 11. Maximum weight at screening of 300lbs as per DEXA requirements 12. Complete a valid OSA assessment Exclusion Criteria: Any of the following conditions are cause for exclusion from the study: 1. Known hypersensitivity or allergy to enobosarm or a GLP-1 receptor agonist 2. Creatinine clearance \< 30 milliliter per minute (mL/min) as measured using the Cockcroft Gault formula (patients with mild and moderate renal failure are not excluded from participation in this study) 3. Treatment with any investigational product within \< 5 half-lives for each individual investigational product OR within 30 days prior to randomization 4. Major surgery within 30 days prior to randomization 5. Planned major surgery during course of the study 6. Testosterone, methyltestosterone, oxandrolone (Oxandrin®), oxymetholone, danazol, fluoxymesterone (Halotestin®), testosterone-like agents (such as dehydroepiandrosterone, androstenedione, and other androgenic compounds, including herbals), myostatin inhibitors, apelin receptor agonists, or antiandrogens (flutamide, bicalutamide, abiraterone, enzalutamide, apalutamide, or darolutamide). Previous therapy with testosterone and testosterone-like agents is acceptable with a 30-day washout (if previous testosterone therapy was long term depot within the past 6 months, the site should contact the Medical Monitor) or any other androgenic agent. 7. An abnormal ECG result which, based on the investigator's clinical judgment, would place the subject at increased medical risk 8. Concurrently participating in any other interventional or treatment clinical trial. 9. Pre-existing liver disease (hepatitis B, uncontrolled hepatitis A, hepatitis C, autoimmune hepatitis, liver cancer, alcohol-associated cirrhosis, alcohol-associated hepatitis, alcohol-associated fatty liver) 10. Baseline ALT or AST \>3x upper limit of normal 11. Baseline total bilirubin levels \> upper limit of normal 12. History of acute pancreatitis within one year of screening or history of chronic pancreatitis 13. Severe gastrointestinal disease, including gastroparesis 14. Major depressive disorder diagnosed within 2 years prior to screening (NOTE: a diagnosis of major depressive disorder ≥2 years prior to screening that is stably managed \[with or without pharmacological intervention\] without additional exclusionary history are not excluded from the study), history of other severe psychiatric disorder, including schizophrenia and bipolar disorder, any lifetime history of suicide attempt, or with suicidal ideation or behavior within 1 month prior to screening. 15. Patient Health Questionnaire score \>15 or any suicidal ideation of type 4 or type 5 on the Columbia-Suicide Severity Rating Scale 16. Monogenic or syndrome obesity, and endocrine causes of obesity (such as untreated hypothyroidism or Cushing's syndrome), and obesity caused by medications that cause weight gain 17. Prior bariatric surgery or weight loss devices unless removed for ≥1 year prior to screening for this study. 18. Patients that are currently taking a GLP-1 receptor agonists or have taken a GLP-1 receptor agonists within one year prior to screening for this study. Patients may not resume treatment with GLP-1 receptor agonists until after the 30-day follow-up visit. 19. Diagnosis of diabetes requiring current use of any antidiabetic drug or HbA1c ≥ 6.5% Note: Metabolic syndrome is not an exclusion, even if managed with an anti-diabetic drug such as metformin or an SGLT2 inhibitor. A diagnosis of prediabetes or impaired glucose tolerance managed with antidiabetic medication or non-pharmacologic approaches (e.g., diet and exercise) is not an exclusion as long as other study criteria are met and the patient has not progressed to a diagnosis of diabetes. 20. Creatine kinase \>ULN 21. Any condition that is exclusionary for use of semaglutide (generally WEGOVY) in the patient. See the WEGOVY Prescribing Information. The following contraindications are listed in the WEGOVY prescribing information: 1. Personal or family history of medullary thyroid carcinoma or in patients with Multiple Endocrine Neoplasia syndrome type 2 2. Known hypersensitivity to semaglutide or any of the excipients in WEGOVY 22. Subjects with active or untreated malignancy within 5 years of screening (NOTE: treated non-melanoma skin cancers are allowable). 23. Male subjects with a lifetime history of malignant prostate disease, such as prostate cancer. 24. Male subjects with a PSA ≥4 ng/mL 25. Patients with prior tendon rupture or those taking concomitant medications that increase the risk of tendon rupture (e.g., fluroquinoline antibiotics, bempedoic acid, or corticosteroids).
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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.
Contacts and locations
Locations
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Altus Research
Lake Worth, Florida, 33461, United States
-
Artemis Institute for Clinical Research
San Diego, California, 92103, United States
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Centennial Medical Group (CMG)
Elkridge, Maryland, 21075, United States
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Clinical Trials of Texas, LLC DBA Flourish Research
San Antonio, Texas, 78229, United States
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Clinvest Headlands LLC
Springfield, Missouri, 65807, United States
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Cullman Clinical Trials
Cullman, Alabama, 35055, United States
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DelRicht Research - New Orleans
New Orleans, Louisiana, 70115, United States
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Lillestol Research LLC
Fargo, North Dakota, 58104, United States
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MARC Research Center
Louisville, Kentucky, 40213, United States
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Palm Research Center
Las Vegas, Nevada, 89119, United States
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Pennington Biomedical
Baton Rouge, Louisiana, 70810, United States
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Pinnacle Trials
Anniston, Alabama, 36207, United States
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SKY Integrative Medical Center
Ridgeland, Mississippi, 39157, United States
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Universal Axom Clinical Research
Doral, Florida, 33122, United States
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