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Weight loss drug combo trial pulled before it even started

NCT ID NCT05209984

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
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 Results may not be published yet.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 This study
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This status has not been confirmed recently, so it may be out of date.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 25, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This was a planned phase 3 study to test a new combination of two drugs, sibutramine and topiramate, for weight loss in overweight and obese adults. The study aimed to see if the combination worked better than either drug alone or a placebo. However, the trial was withdrawn before enrolling any participants, so no data was collected.

What this could mean

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

Active substance
Sibutramine and topiramate combination
What this could lead to
If successful, this could provide a new weight-loss medication option for adults who are overweight or obese.
What could go wrong
The trial was withdrawn before any participants were enrolled, so no results are available. Sibutramine has known safety concerns, including cardiovascular risks.

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.

Expected to start

Apr 2026

An estimate. Start dates often move.

Expected to finish

Mar 2028

An estimate. End dates often move.

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

18 to 60 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. Male or female volunteers aged between 18 and 60 years (inclusive); 2. BMI ≥ 27kg/m2 and \< 45kg/m2. Patients with a BMI ≥ 27kg/m2 and \< 30kg/m2 must have at least one of the following comorbidities to be included in the study: dyslipidemia, systemic arterial hypertension (SAH), pre-diabetes (fasting glucose ≥ 100mg/dL and \< 126 mg/dL and/or HbA1c ≥ 5.7% and \< 6.5%\] and/or sleep apnea (confirmed by polysomnography performed up to three months before enrollment in the study); 3. Women of childbearing age must use adequate contraceptive methods; 4. Volunteers willing and able to comply with all aspects of the protocol; 5. Signing the Informed Consent Form (ICF) before performing any study procedure. Exclusion Criteria: 1. Participation in a lifestyle change program within the three months prior to the start of the study; 2. Treatment with drugs (prescription or over-the-counter) or alternative drugs intended to promote weight loss within the three months prior to the start of the study. These medications include, among others: liraglutide, orlistat, sibutramine, topiramate, naltrexone, bupropion, sertraline, fluoxetine, duloxetine. Note: The use of metformin or other hypoglycemic drugs prescribed for the treatment of polycystic ovary syndrome or prevention of diabetes is not permitted; 3. Treatment with drugs known to cause significant weight gain within three months of starting the study. These medications include, among others: corticosteroids, tricyclic antidepressants, atypical antipsychotics, and mood stabilizers (such as imipramine, amitriptyline, mirtazapine, paroxetine, phenelzine, chlorpromazine, thioridazine, clozapine, olanzapine, valproic acid and its derivatives, lithium). 4. Presence of diabetes mellitus; 5. History of coronary artery disease (angina, history of myocardial infarction); 6. Congestive heart failure; 7. History of tachycardia; 8. History of peripheral obstructive arterial disease; 9. History of arrhythmia; 10. History of cerebrovascular disease (stroke or transient ischemic attack); 11. Inadequately controlled systemic arterial hypertension (\> 145/90 mmHg); 12. History or active pulmonary arterial hypertension; 13. History or presence of eating disorders such as bulimia and anorexia; 14. Moderate or severe renal impairment (estimated creatinine clearance \< 70 mL/min); 15. Hepatic failure Child-Pugh categories B or C (Child-Pugh scale score ≥ 7 points); 16. Current use of monoamine oxidase inhibitors (MAOIs) or any other drug treatment for psychiatric disorders; 17. History of psychiatric disorder requiring previous drug treatment; 18. Glaucoma or high intraocular pressure; 19. Unstable thyroid disease or replacement therapy; 20. Hypersensitivity to sibutramine, topiramate, or to any component of the investigational product formulation; 21. Known hypersensitivity to any component of the investigational drug formulation; 22. Urinary lithiasis; 23. Pregnancy or lactation; 24. Any medical or other condition that, in the opinion of the investigator(s), prevents the participant from participating in the clinical trial, such as significantly abnormal laboratory results or any physical or mental condition that prevents compliance with the protocol.

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Conditions

The condition(s) this trial relates to.

Obesity obesity disorder Overweight

As listed by the trial registrant

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

Contacts and locations

Locations

  • Eurofarma Laboratórios S.A

    São Paulo, São Paulo, 06696-000, Brazil

  • HC-FMUSP

    São Paulo, São Paulo, Brazil

More trials for these conditions

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