PT-141 (Bremelanotide) (Bremelanotide (PT-141 / Vyleesi))
A synthetic melanocortin peptide FDA-approved for HSDD in premenopausal women. Works through CNS to enhance sexual desire rather than vascular mechanisms.
How it works
MC4R agonist in hypothalamus activating central sexual arousal pathways. Increases dopaminergic signaling independent of vascular mechanisms.
Key facts
- Molecular weight: 1,025 Da
- Half-life: 2.7 hours
- Bioavailability: High (SubQ)
- Storage: Room temperature (autoinjector). Lyophilized: 2-8°C.
Dosing overview
- Typical dose: 1.75 mg
- Frequency: As needed, ~45 min before activity
- Duration: As needed
- Route: Subcutaneous injection
Protocol notes
- A single 1.75 mg dose taken roughly 45 minutes before intended activity.
- First-timers often trial a half dose (~1 mg) to gauge nausea before using the full amount.
Reported benefits
- Increased sexual desire
- Central arousal mechanism
- Works both sexes (research)
- Non-vascular
- Rapid onset
Possible side effects
- Nausea (40%)
- Flushing
- Headache
- Transient hypertension
- Skin darkening (rare)
Research
- RECONNECT trials: Bremelanotide for HSDD (2019): Significantly increased sexual desire and reduced distress vs placebo, leading to FDA approval.
- MC4R activation in male sexual dysfunction (2021): Produced erections in 80% of men who failed PDE5 inhibitors via central mechanisms.
Community reviews of PT-141 (Bremelanotide)
- cold_chain_carl rated it 4/5 - Noticed clear benefits within weeks: Added PT-141 (Bremelanotide) to my protocol about 3 weeks ago and it has earned its place. The benefits became noticeable around week 2-3 and have been consistent since. What I appreciate about this compound is the predictability. It does what the research suggests it should do, at roughly the timeline you would expect. No surprises, no dramatic swings, just steady improvement. No notable side effects to report at my dose. Sourcing is always the challenge with research compounds, insist on third-party testing. Storage and reconstitution per standard protocols. Plan to continue.
- cycling_chad rated it 5/5 - Worth adding to the protocol: PT-141 (Bremelanotide) has been a worthwhile addition. I am data-driven and tracked relevant markers before, during, and after. The improvement is measurable and correlates with the intervention timeline. What sets this apart from some compounds I have tried is the consistency. Benefits did not fluctuate wildly or disappear. They built up and maintained. That gives me confidence in the mechanism. Tolerance has been excellent. Nothing in my bloodwork or subjective experience raised any flags. This is the kind of compound that does its job quietly without causing problems. Exactly what you wan
- peptide_path_pam rated it 4/5 - Genuinely effective after 2 weeks: Been using PT-141 (Bremelanotide) for about 2 weeks and the results are clear. Not overnight dramatic, but a steady, consistent improvement that became undeniable by the end of the first month. The mechanism makes sense based on what I have read in the literature, and my subjective experience matches the expected timeline. Benefits built gradually and plateaued at a good level. Side effects were minimal to none at the dose I used. Followed proper protocols for sourcing, storage, and administration. Would recommend to others who have done their research and have realistic expectations.
- runner_kai rated it 5/5 - actually wanted to initiate again, 6 weeks in: the one thing that mattered, my libido went from "meh, maybe" to actually initiating things myself for the first time in years. that shift alone is why this is a 5 for me. nausea the first couple doses was rough but faded fast. worth the trade for me.
- formerjosh rated it 4/5 - Strong urge, but less clean than tadalafil: I tried PT-141 for about 4 months while juggling clinic work and training in Japan. It did increase desire for me, a bit faster than I expected, but I still preferred tadalafil for the overall feel. PT-141 had more nausea and a strange flush, so I kept it as occasional use.
- tracker_jade rated it 5/5 - PT-141 helped, but the flushing was real: I tried PT-141 for about 8 weeks because my sex drive had taken a nosedive while I was working long school days, lifting after work, and generally being tired in the Midwest winter. For me, it did kick things back on in a way I noticed pretty fast. That part was honestly great. The downside was the flushing and weird pressure in my face, plus a little nausea the first couple times. It always settled down, but it was annoying enough that I had to plan around it. Still, anecdotally, the payoff was strong enough that I kept using it and would rate it 5 stars.
Compare PT-141 (Bremelanotide)
Research and educational reference only. Not medical advice.