What is tesofensine and how does it work?

Tesofensine is an investigational weight loss compound that works as a triple monoamine reuptake inhibitor, simultaneously blocking the reuptake of dopamine, norepinephrine, and serotonin. By increasing levels of all three neurotransmitters, it reduces appetite (serotonin), increases metabolic rate (norepinephrine), and enhances satiety from smaller portions (dopamine). Phase II trials showed 9.2-12.8% body weight loss over 24 weeks depending on dose.

How much weight can you lose with tesofensine?

Clinical trials demonstrated dose-dependent weight loss: 4.5% at 0.25mg, 9.2% at 0.5mg, and 10.6-12.8% at 1.0mg over 24 weeks. In absolute terms, this translates to approximately 11-13 kg (24-29 lbs) average weight loss at the 0.5-1.0mg dose range — approximately 5-6x greater than placebo. The 0.5mg dose is considered the optimal balance of efficacy and tolerability.

Is tesofensine FDA approved?

Tesofensine is not FDA-approved for general weight loss. However, it received FDA Breakthrough Therapy Designation for Prader-Willi Syndrome (a rare genetic obesity disorder) in 2019. Phase III trials are ongoing for Hypothalamic Obesity and Prader-Willi Syndrome. It is currently available only as a research compound and is not approved for therapeutic use.

What are the side effects of tesofensine?

Common side effects include dry mouth (30-40%), insomnia (20-30%), constipation (15-25%), increased heart rate (10-20%), and elevated blood pressure (5-15%). Most side effects are dose-dependent and diminish after 2-4 weeks. Tesofensine is contraindicated in those with uncontrolled hypertension, cardiovascular disease, or history of psychiatric disorders. Medical supervision with regular blood pressure monitoring is essential.

How does tesofensine compare to semaglutide?

Tesofensine and semaglutide work through completely different mechanisms. Semaglutide is a GLP-1 receptor agonist that reduces appetite through gut-brain signaling. Tesofensine is a triple monoamine reuptake inhibitor that targets brain reward and metabolic pathways. Semaglutide produces 15-20% weight loss over 68 weeks (FDA-approved). Tesofensine showed 9-13% over 24 weeks (not FDA-approved). They may represent an alternative for GLP-1 non-responders.

What is the correct tesofensine dosage?

Clinical trials used 0.25mg, 0.5mg, and 1.0mg daily, taken orally in the morning. The 0.5mg dose showed the optimal efficacy-to-tolerability ratio. Standard practice starts at 0.125mg for 1-2 weeks, titrating to 0.25mg, then 0.5mg over 4-5 weeks. Tesofensine has a very long half-life (200-300 hours), so steady-state is achieved within 2-3 weeks of consistent dosing.

PeptideKey Research Library

Tesofensine: The Fat Loss Peptide That Works – Dosing Guide

Explore Tesofensine, a peptide studied for its role in fat loss. Learn about its research applications, potential effects, and important safety notes for informed use.

This research guide is part of PeptideKey's evidence-based peptide research library covering 100+ compounds with lab-verified purity data.