PT-141 / Bremelanotide
Also known as: PT-141 · Bremelanotide · Vyleesi · PT141
PT-141 is a potent agonist of melanocortin receptors MC3R and MC4R in the hypothalamus and limbic system. MC4R activation specifically stimulates sexual arousal pathways independent of testosterone and estrogen. Unlike PDE5 inhibitors (Viagra, Cialis) which work on penile vascular tissue,...
What It Is
PT-141 is a potent agonist of melanocortin receptors MC3R and MC4R in the hypothalamus and limbic system. MC4R activation specifically stimulates sexual arousal pathways independent of testosterone and estrogen. Unlike PDE5 inhibitors (Viagra, Cialis) which work on penile vascular tissue, PT-141 acts centrally in the brain to enhance libido and sexual desire in both men and women. It increases dopamine release and activates nitric oxide pathways that facilitate arousal. FDA approved as Vyleesi (subcutaneous autoinjector) for hypoactive sexual desire disorder (HSDD) in premenopausal women.
Supplies Needed
Reconstitution solvent
Subcutaneous injection
Sterilization
Managing nausea side effects
Storage
Store at -20C for up to 2 years. Protect from light.
Refrigerate at 2-8C; use within 30 days.
This information is provided for educational and research purposes only. Not approved for human consumption by the FDA or any regulatory body. Always consult a qualified medical professional.
Dosing Protocols
Timing: 45-90 minutes before intended sexual activity. Start with 0.5 mg to assess nausea tolerance; have anti-nausea medication on hand if needed
↓ Apply these values to the reconstitution calculatorTiming: 45-90 minutes before intended sexual activity. 1 mg is the FDA-approved dose for Vyleesi in women; standard dose for men
↓ Apply these values to the reconstitution calculatorTiming: 45-90 minutes before intended activity. Higher doses increase tanning and nausea risk; 2 mg is maximum research dose
↓ Apply these values to the reconstitution calculatorWeekly Timeline
| Week | Expected Effects |
|---|---|
| Week 1 | Acute effects: enhanced arousal and sexual response within 45-90 minutes of each dose |
| Week 2 | Better tolerance of nausea with repeated use; consistent arousal enhancement |
| Week 4 | Some users report improved baseline libido with regular use; consistent acute arousal effects |
Reconstitution Calculator
1 unit on U-100 syringe = 0.01 mL · Always label your vial after reconstitution
Injection Technique & Reconstitution
- Remove flip-top cap from the vial
- Swab rubber stopper with alcohol swab
- Draw 2 mL bacteriostatic water into syringe
- Inject slowly down the vial wall
- Gently swirl until dissolved
- Label with reconstitution date; refrigerate at 2-8C
Use our free reconstitution calculator to get the exact syringe units for your vial size and dose.
Mechanism of Action
PT-141 is a potent agonist of melanocortin receptors MC3R and MC4R in the hypothalamus and limbic system. MC4R activation specifically stimulates sexual arousal pathways independent of testosterone and estrogen. Unlike PDE5 inhibitors (Viagra, Cialis) which work on penile vascular tissue, PT-141 acts centrally in the brain to enhance libido and sexual desire in both men and women. It increases dopamine release and activates nitric oxide pathways that facilitate arousal. FDA approved as Vyleesi (subcutaneous autoinjector) for hypoactive sexual desire disorder (HSDD) in premenopausal women.
Key Research Papers
Phase II clinical trial demonstrating significant improvement in erectile function in men with erectile dysfunction resistant to Viagra, establishing central mechanism of action.
View on PubMed →Pivotal clinical trials supporting FDA approval of Vyleesi (bremelanotide) showing significant improvement in sexual desire and satisfaction in premenopausal women with HSDD.
View on PubMed →Stacks Well With
PT-141 enhances sexual arousal and libido centrally while oxytocin promotes bonding, intimacy, and sensory enhancement. Complementary for sexual experience enhancement.
Kisspeptin-10 stimulates GnRH and downstream testosterone/LH release while PT-141 provides immediate arousal enhancement - complementary for libido optimization.
Frequently Asked Questions
PT-141 is used to enhance sexual arousal and libido in both men and women. It works centrally in the brain (unlike Viagra which works peripherally on blood vessels). It is FDA-approved as Vyleesi for hypoactive sexual desire disorder in women.
Viagra and Cialis are PDE5 inhibitors that increase blood flow to the penis by acting on vascular tissue. PT-141 acts in the brain via melanocortin receptors to stimulate desire and arousal centrally. It works in cases where PDE5 inhibitors fail, and works in women too.
PT-141 should be injected 45-90 minutes before intended sexual activity. Effects typically last 6-12 hours.
Start with the lowest effective dose (0.5 mg). Take on an empty stomach. Consider having over-the-counter anti-nausea medication available. Nausea typically peaks around 1-2 hours post-injection and subsides within a few hours.
Legal Status by Region
This information is provided for educational and research purposes only. Not approved for human consumption by the FDA or any regulatory body. Always consult a qualified medical professional.