Tesofensine.

Quick Overview.

Tesofensine (NS2330) is not a peptide; it is a small molecule synthetic drug originally developed by NeuroSearch to treat Parkinson's and Alzheimer's diseases. While it failed for those conditions, researchers noticed a massive side effect: the patients were losing a significant amount of weight.[1]

Tesofensine works entirely in the brain by preventing the reuptake of three key neurotransmitters: Dopamine, Serotonin, and Norepinephrine. Normally, your brain releases these chemicals and then quickly sucks them back up (reuptake). Tesofensine blocks the "vacuum" that sucks them back up. As a result, your brain is flooded with Dopamine (reward/motivation), Serotonin (happiness/fullness), and Norepinephrine (energy/fat burning). You feel incredibly full, highly motivated, and your body burns more calories.[2]

• Primary Use Case: Severe appetite suppression, increased metabolic rate, and mood enhancement.
• Mechanism: Triple monoamine reuptake inhibitor (SNDRI) that increases synaptic concentrations of dopamine, serotonin, and norepinephrine.[2]
• Who it is for: Individuals who struggle with severe cravings, low energy during a diet, or those who cannot tolerate the nausea associated with GLP-1 agonists.
• Who it is NOT for: Individuals with high blood pressure, a history of heart disease, or anyone taking psychiatric medications (especially SSRIs/SNRIs).

The Protocol & Usage Guide.

confidence_tier: well-established

Because Tesofensine is a small molecule, it is taken orally as a capsule or tablet. It has an incredibly long half-life of approximately 8 to 9 days, meaning the drug accumulates in your system over time.[3]

Standard Dosing

Note: Clinical trials tested 0.25mg, 0.5mg, and 1.0mg. The 1.0mg dose caused too many cardiovascular side effects. The 0.5mg dose is considered the "sweet spot" for efficacy and safety.[1]

Cycle Length

• Standard Cycle: 3 to 6 months.
• Why Cycle? Because it alters monoamine levels, long-term use can theoretically lead to receptor downregulation. Cycling the drug (e.g., 6 months on, 2 months off) is recommended to maintain receptor sensitivity.
• Discontinuation: Because it alters brain chemistry, stopping abruptly can cause a "crash" (lethargy, depression, massive hunger return). A slow taper (e.g., taking it every other day, then every third day) is highly recommended.

Nutritional Support & Recommended Supplements.

confidence_tier: emerging

Safety, Interactions & Side Effect Management.

confidence_tier: well-established

Because Tesofensine increases Norepinephrine and Dopamine, it acts as a central nervous system stimulant. It can significantly increase heart rate and blood pressure.

Side Effect Profile

Contraindications

• Absolute: Individuals taking MAOIs, SSRIs, SNRIs, or any other psychiatric medication (High risk of Serotonin Syndrome).
• Absolute: Individuals with uncontrolled high blood pressure, tachycardia, or a history of heart disease.
• Absolute: Pregnant or breastfeeding women.

Drug Interactions

• SSRIs / SNRIs / MAOIs: Combining Tesofensine with these medications can cause Serotonin Syndrome, a potentially fatal condition characterized by high fever, seizures, and irregular heartbeat.

Common Stacks & Combinations.

confidence_tier: community

Body Composition & Training Guide.

confidence_tier: community

• Muscle Preservation: Like any drug that causes a massive caloric deficit, you will lose muscle if you do not eat enough protein and lift weights. However, the stimulant effect of Tesofensine often helps users maintain high training intensity, which helps preserve muscle.[7] |
• Cardio: Monitor your heart rate closely during cardio. Because Tesofensine already elevates your baseline heart rate, intense cardio may push your heart rate into uncomfortable or unsafe zones faster than usual.[8]

Storage, Handling & Accessibility.

confidence_tier: well-established

• Storage: Store oral capsules at room temperature in a cool, dry place away from direct sunlight.
• WADA Status: PROHIBITED. Banned in-competition under S6 (Stimulants).

Bloodwork Monitoring Guide.

confidence_tier: emerging

Before starting and during a cycle:

• Blood Pressure & Heart Rate: These are the most critical metrics to monitor, rather than bloodwork. Check BP and resting HR weekly.
• Comprehensive Metabolic Panel (CMP): To ensure liver and kidney function remain normal during rapid weight loss.

Comparison to Similar Compounds.

confidence_tier: well-established

Deep Dive (For Advanced Researchers).

confidence_tier: well-established

Mechanism of Action

Tesofensine is a triple monoamine reuptake inhibitor. It binds to the transporters for dopamine (DAT), serotonin (SERT), and norepinephrine (NET), preventing the reuptake of these neurotransmitters from the synaptic cleft.[2]

1. Appetite Suppression: The increase in serotonin and dopamine in the hypothalamus creates a profound sense of satiety and reward, eliminating the psychological desire to eat.
2. Energy Expenditure: The increase in norepinephrine reuptake increases sympathetic nervous system tone. This directly increases resting energy expenditure (thermogenesis) and stimulates lipolysis in adipose tissue.[2]
3. GABAergic Silencing: Recent studies (2023) suggest that Tesofensine's profound appetite suppression is also mediated by silencing GABAergic neurons in the lateral hypothalamus, a novel mechanism that separates it from older stimulants like Phentermine.[4]

Clinical Trial Summary

• Phase 2 Obesity Trial (TIPO-1): In a 24-week, randomized, double-blind, placebo-controlled trial published in The Lancet, 203 obese patients were given either placebo, 0.25mg, 0.5mg, or 1.0mg of Tesofensine.[1]
• Results: The placebo group lost 2.2 kg. The 0.25mg group lost 6.7 kg. The 0.5mg group lost 11.3 kg. The 1.0mg group lost 12.8 kg.[1]
• The Catch: The 1.0mg dose caused significant increases in heart rate and blood pressure, leading to a high dropout rate. The 0.5mg dose produced massive weight loss (roughly 10% of body weight) with a manageable side effect profile.[1]
• Phase 3 & Approval: NeuroSearch ran out of funding before completing Phase 3 trials in the US. However, the Mexican pharmaceutical company Medix acquired the rights, completed the trials, and successfully gained approval for Tesofensine in Mexico in 2023.

Frequently Asked Questions (FAQ).

confidence_tier: community

Q: Is Tesofensine a peptide? A: No. It is a small molecule synthetic drug. It is grouped with peptides because it is sold by the same research chemical companies and used by the biohacking community for weight loss.

Q: Is it like Adderall or Phentermine? A: It is similar in that it increases dopamine and norepinephrine, giving you energy and suppressing appetite. However, because it also increases serotonin, it provides a much "smoother" feeling of well-being and satiety, without the harsh, jittery crash associated with amphetamines.

Q: Why is the long half-life a problem? A: A half-life of 8 days means the drug builds up in your system. If you take 0.5mg every day, by week 4, you have a much higher concentration in your blood than you did in week 1. If you suddenly experience severe insomnia or a racing heart, stopping the drug won't fix the problem immediately; it will take weeks to leave your system.

Q: Can I take it with my antidepressant? A: Absolutely NOT. Combining Tesofensine with an SSRI (like Lexapro, Zoloft, Prozac) or an SNRI can cause Serotonin Syndrome, a potentially fatal condition.

International Regulatory Status.

confidence_tier: well-established

Decision Tree.

confidence_tier: community

[Goal: Fat Loss & Appetite Suppression?]
  |
  +-- Are you taking any antidepressants (SSRIs/SNRIs)?
        |
        +-- (Yes) -> STOP: Tesofensine is strictly contraindicated. Use GLP-1s.
        |
        +-- (No) -> Do you have high blood pressure or heart issues?
              |
              +-- (Yes) -> STOP: Tesofensine will increase heart rate and BP.
              |
              +-- (No) -> Use Tesofensine (0.25mg - 0.5mg daily).

Schema.org Data.

{
  "@context": "https://schema.org",
  "@type": "MedicalEntity",
  "name": "Tesofensine",
  "alternateName": ["NS2330"],
  "description": "A triple monoamine reuptake inhibitor (SNDRI) that suppresses appetite, increases resting energy expenditure, and elevates mood by increasing synaptic concentrations of dopamine, serotonin, and norepinephrine.",
  "legalStatus": {
    "@type": "DrugLegalStatus",
    "description": "Approved in Mexico for obesity. Unapproved by FDA; available as a research chemical. Prohibited in-competition by WADA."
  }
}

What we cited.