Weight loss drug combo trial pulled before it even started
NCT ID NCT05209984
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 However, the trial was withdrawn before enrolling any participants, so no data was collected.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- The trial was withdrawn before any participants were enrolled, so no results are available.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
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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 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: 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.
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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Eurofarma Laboratórios S.A
São Paulo, São Paulo, 06696-000, Brazil
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HC-FMUSP
São Paulo, São Paulo, Brazil
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