PT-141
Also known as Vyleesi (bremelanotide)
Quick facts
- Researched for
- Libido, sexual desire, arousal and erectile response
- Route or form
- Injection; nasal spray planned
- Evidence so far
- FDA-approved in 2019 after 2 large trials in women; men's use rests on forum reports.
- Not established
- The approved use does not prove other uses, people or products work the same way.
- Commonly researched
- 1.75 mg, as needed, at least 45 minutes before sexual activityPrescription label (branded medicine)See every range
- Where to get it
- Vyleesi is a prescription medicine. A doctor prescribes it and a pharmacy fills it.Our partner, US Precision Peptides, lists a separate PT-141 product, not that medicine.Go to Next step
By the Learn Peptides editorial team · Updated · How We Research
What people are researching it for
People are researching PT-141 for libido, sexual desire, arousal, and erectile response.
Desire. Arousal. Response.
- What is PT-141?
- Checklist: Not FDA approved for men or performance enhancement
- How does it work?
- Note: The exact mechanism isn't fully understood, but effects appear to be centrally mediated rather than primarily vascular.
- Common research use cases
- Not written out in this text version.
- How it's used in research
- Route: Subcutaneous (most common)
- Route: Intranasal (in some studies)
- Route: Oral (not effective)
- Common dosing: 100 to 500 mcg per dose
- Common dosing: Often used as needed (not daily)
- Common dosing: No more than 1 dose in 24 hours (per labeling)
- Onset & duration: Effects often delayed
- Onset & duration: Common onset: 3 to 6 hours
- Onset & duration: Peaks: 6 to 12 hours
- Onset & duration: May last into the next day
- There is no standardized dose or protocol. Research use should be thoughtful, tracked, and adjusted based on individual response.
- What users report
- Often combined with PDE5 inhibitors (e.g., tadalafil)
- Keep in mind: Nausea is the most common side effect
- Keep in mind: Flushing, headache, and increased blood pressure can occur
- Keep in mind: Risk of prolonged erections (priapism) in men
- Keep in mind: Not FDA approved for men or for performance enhancement
- Highly variable response; some users experience minimal effects
- Key takeaway
- It's not an instant effect, and nausea is common, but for many researchers it offers a different approach to sexual health than traditional options.
- The bottom line
- PT-141 shows real potential in research, particularly for sexual desire and arousal, with a unique central mechanism of action. However, the response is highly individual, side effects like nausea are common, and more high-quality human studies are needed. Use only high-purity peptides, follow a research-focused approach, and set realistic expectations.
Reasons people look into PT-141. An interest is not a promise that it works.
- Sexual health & libido
People most often say they feel more desire, with nausea, flushing and mixed results.
Community reports
Many people report a clear increase in sexual interest or arousal. Nausea, flushing, and uneven response are also common.
Community reports
PT-141 is a peptide many men use to boost sexual desire before sex, usually as a one-time shot rather than something taken on a fixed schedule. Most people who try it notice some effect on desire or erections, but a real share feel nothing, and side effects like nausea and flushing are common.
Large trials tested the approved form in women with low sex drive before menopause.
Bremelanotide, the drug form the approved in 2019, has large human trials for low sexual desire in women before menopause.
A melanocortin peptide discussed for sexual wellness and libido, in both men and women.
What this is based on
- Human researchStudied in people for this or a related question.
- Community reportsWhat people describe noticing. Not proof of cause.
- Learn Peptides explanationOur own plain-English summary of the sources. It is not a source itself.
The approved use does not prove other uses, people or products work the same way.
That approved use does not prove every community use, every population, or every non-prescription version works the same way.
Safety notes
Tested in people. How many took part, for how long, and who they were still matter.
- You have trouble breathing or wheezing, or your face, lips, tongue or throat swell.
- You get hives away from the injection site, or feel severely dizzy or faint.
For these signs, call 911 or your local emergency number.
- Redness spreads, or heat, swelling or pain keeps growing where you injected.
- A lump keeps growing or does not go away, or you see pus or red streaks.
- You have a fever or chills, or feel sick all over.
- Heart disease or high blood pressure. Its label says not to use it with uncontrolled high blood pressure or heart disease, because it raises blood pressure.
Questions to bring to your doctor
Only for the conditions this page cautions about. Bring this page with you.
- Should I avoid PT-141 with my heart or blood pressure history? What would you check before I decide?
Shows the label amount for Vyleesi, kept apart from what people report.
Commonly researched ranges, and how they were measured.
Commonly researched range for PT-141
1.75 mg
as needed, at least 45 minutes before sexual activity · Injection
Prescription label (branded medicine)
This is the label amount for the branded medicine Vyleesi. It is not a dosing instruction for other products.
The range in our record
Each one is labeled with where it comes from. They are different ways of using PT-141, not steps to follow in order.
On-demand dose
Prescription label (branded medicine)FDA label (Vyleesi)- Amount per dose
- 1.75 mg
- How often
- As needed, at least 45 minutes before sexual activity. At least 45 minutes before anticipated sexual activity.
- Typical schedule
- Not stated
- Route
- Injection
This is the label amount for the branded medicine Vyleesi. It is not a dosing instruction for other products.
From our visual summary
Community reports
Community reports, from the Learn Peptides visual summary. These lines sit beside the ranges above and are not merged with them.
- Common dosing
- 100 to 500 mcg per dose
- Often used as needed (not daily)
- No more than 1 dose in 24 hours (per labeling)
- Onset & duration
- Effects often delayed
- Common onset: 3 to 6 hours
- Peaks: 6 to 12 hours
- May last into the next day
There is no standard dose. Track how you respond, and change one thing at a time.
These ranges were last reviewed Sep 2026.
The peptide behind Vyleesi, FDA-approved in 2019, working through the brain, not blood vessels.
PT-141 (bremelanotide) works through signals in the brain (the melanocortin system), not through blood flow like older approaches. That is part of why it's discussed for both men and women. It's the compound behind Vyleesi, a product the approved in 2019. In the broader research community, it's usually discussed as an injection under the skin (), taken ahead of when it's needed rather than daily.
Next step
Product forms
Forms of PT-141. Each one shows its own product link, or why there is none.
PT-141 10 mg vial
10 mg per vial. This is the total in one vial, not an amount to take.
PT-141 nasal spray
Made to order. Arrives ready to use.
No mixing or reconstitution needed.
Strength, amount per spray and dosing are not set yet.
The reports and amounts on this page are about the injected form. They do not describe this nasal spray.
No partner product
US Precision Peptides has no listing for this form yet, so there is no product link.
Oxytocin + PT-141 nasal spray
Made to order. Arrives ready to use.
No mixing or reconstitution needed.
The ratio, strength, amount per spray and dosing are not set yet.
The reports and amounts on this page are about the injected form. They do not describe this nasal spray. This product also contains Oxytocin. Reports about one ingredient do not describe the two together.
No partner product
US Precision Peptides has no listing for this form yet, so there is no product link.
About product links
Purchases at US Precision Peptides help keep Learn Peptides free.