Melanocortin Approved (outside US)

PT-141

Also known as: Bremelanotide, Vyleesi, PT141

The only FDA-approved peptide for sexual desire — acts on the brain's MC4 arousal pathway rather than blood flow, effective for both men and women.

Popularity A
Class Melanocortin-4 Receptor Agonist
Half-Life ~2.7 hours
Form Pre-filled autoinjector (Vyleesi), Lyophilized powder (research)
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PT-141 C50H68N14O10
Research-Backed User Reports Sourced Updated Mar 2026
// Overview

What is PT-141?

PT-141 (Bremelanotide, brand name Vyleesi) is a synthetic melanocortin peptide derived from Melanotan II, specifically designed to target the MC4 receptor pathway responsible for sexual arousal. Unlike PDE5 inhibitors (Viagra, Cialis) that work on blood flow, PT-141 acts centrally in the brain on the arousal pathway itself.

PT-141 was developed after researchers studying Melanotan II noticed significant pro-sexual effects. By removing the UV-stimulated tanning component and optimizing for MC4R selectivity, they created a targeted sexual function drug that was eventually FDA-approved in 2019 as Vyleesi for premenopausal women with hypoactive sexual desire disorder (HSDD).

PT-141 works for both men and women because it targets the central desire pathway rather than peripheral blood flow. For men, it can be effective where PDE5 inhibitors fail (particularly in cases of psychogenic erectile dysfunction or low libido). For women, it addresses desire rather than arousal mechanics.

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// How It Works

How PT-141 Works

PT-141 works centrally on the brain's sexual desire circuitry:

  1. MC4R activation — Selectively activates melanocortin-4 receptors in the hypothalamus and limbic system, directly stimulating the neural circuits responsible for sexual desire and arousal.
  2. Central, not peripheral — Unlike PDE5 inhibitors (Viagra) that increase blood flow to genitals, PT-141 acts on the brain's desire pathway. This means it addresses desire, not just mechanics.
  3. Gender-independent — The MC4R arousal pathway is present in both sexes, making PT-141 effective for both male and female sexual dysfunction.
  4. Dopamine modulation — MC4R activation in the hypothalamus enhances dopaminergic signaling in reward and arousal circuits, increasing both desire and pleasure response.
// Dosage Protocols

Dosage Information (User-Reported)

Disclaimer: Dosage information is compiled from user reports and published research. This is not medical advice. Consult a healthcare professional before use.
Level Dose Frequency Duration
FDA-Approved (Women) 1.75 mg As needed (45 min before activity) Max 8 doses/month
Male Off-Label 1-2 mg As needed (45-60 min before) As needed
Low Dose (Male) 0.5-1 mg As needed As needed

What to Expect

30-45 min

Effects begin. Heightened sense of desire and arousal. Warmth and flushing common. Nausea possible (especially first use).

1-3 hours

Peak effects. Significantly enhanced desire, sensitivity, and arousal response. Both men and women report more intense experience.

4-8 hours

Effects gradually subside. Some residual enhancement may persist for several hours.

Note

Nausea is common with first use — starting with a lower dose (0.5mg) can help. Anti-nausea medication 30 min before can prevent this.

Common Stacks

BPC-157

Nausea Mitigation

BPC-157's GI-protective effects may help reduce the nausea commonly associated with PT-141

Melanotan II

Full Melanocortin Stack

MT-II provides tanning + libido while PT-141 offers more targeted sexual effects (overlap exists)

Oxytocin

Intimacy Enhancement

Combines arousal (PT-141) with bonding/connection (oxytocin) for comprehensive sexual wellness

// Preparation

Reconstitution & Storage

For research-grade lyophilized powder: Reconstitute with bacteriostatic water.

The FDA-approved Vyleesi autoinjector requires no reconstitution — it is pre-filled and ready to use.

Administer 45 minutes before anticipated sexual activity. Do not use more than once in 24 hours or more than 8 times per month.

Storage: Pre-filled autoinjector: room temperature. Lyophilized: 2-8°C. Reconstituted: 2-8°C, use within 30 days.

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// Safety Profile

Side Effects & Safety

Potential Side Effects

  • ! Nausea (40% — most common, typically resolves after first few uses)
  • ! Flushing
  • ! Headache
  • ! Injection site reactions
  • ! Dizziness
  • ! Nasal congestion
  • ! Transient blood pressure elevation
  • ! Darkening of skin around face/gums (with repeated use)

Contraindications

  • ⚠ Uncontrolled hypertension
  • ⚠ Cardiovascular disease
  • ⚠ Pregnancy or breastfeeding
  • ⚠ Do not use with other melanocortin receptor agonists (Melanotan II)
  • ⚠ Severe hepatic impairment

Legal & Regulatory Status

FDA-approved as Vyleesi (bremelanotide) for premenopausal HSDD. Prescription-only for approved indication. Research-grade PT-141 available from peptide vendors. Not a controlled substance.

// Research

Published Research

// Where to Buy

Top Vendors for PT-141

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// Related Compounds

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BPC-157 Arginate (Oral)

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TB-500 Fragment

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This content is for informational and educational purposes only. PT-141 is sold for research purposes. Never Natty does not condone or encourage the use of any substance in violation of any laws. Consult a healthcare professional before using any compound discussed on this site.