Peptide PT-141 (bremelanotide) is an FDA-approved injection for low sexual desire in premenopausal women. Learn uses, dosing, side effects, and legal risks.
Peptide PT-141 — known generically as bremelanotide and sold under the brand name Vyleesi — is a prescription melanocortin receptor agonist that the FDA approved in 2019 for low sexual desire in premenopausal women. It is given as a subcutaneous injection, not a pill, and it is not FDA-approved for men, for nasal spray use, or for over-the-counter sale in the United States.
What Is Peptide PT-141?
PT-141 is a synthetic cyclic heptapeptide, meaning it is built from seven amino acids. Its structure is modeled on alpha-melanocyte-stimulating hormone, a signaling molecule the body already produces, and it is a metabolite of melanotan II, a compound first studied for tanning.
PT-141 is not a hormone and not a blood-flow drug. It contains no testosterone, and it does not work like sildenafil or tadalafil. Instead, it acts in the brain and central nervous system, which is why it is often described as a desire-focused agent rather than an erection drug.
How PT-141 Works and How It Differs From Other Options
Bremelanotide binds to melanocortin receptors, primarily MC4R, in the central nervous system. Researchers believe that binding influences dopamine-related pathways involved in sexual desire and arousal.
Search interest in pt-141 peptide for men stays high, but the FDA has not approved bremelanotide for male sexual dysfunction, and the male-focused studies that exist were small or used a nasal formulation that is no longer marketed.
Another practical difference is timing. PT-141 is taken on demand, roughly 45 minutes before anticipated activity, instead of daily. It does not need to build up in the bloodstream to work.
FDA Approval Status: Who It's Actually Prescribed For
| Use case | FDA status | Notes |
|---|---|---|
| Low sexual desire (HSDD) in premenopausal women | Approved (2019) | Sold as Vyleesi; 1.75 mg subcutaneous autoinjector |
| Erectile dysfunction in men | Not approved | Studied in small trials; nasal version discontinued |
| Nasal spray form | Not approved | Original development format, shelved over blood pressure concerns |
| Postmenopausal women | Not approved | Limited data; not studied in the pivotal trials |
| Over-the-counter or supplement sale | Not legal | Prescription-only medicine in the US |
Bremelanotide is available only by prescription, usually after a telehealth or in-person visit. A pharmacy cannot legally dispense it without one, and it is not stocked as a supplement.
PT-141 Peptide Dosage Chart, Injection, and Nasal Spray
The approved dose is 1.75 mg injected subcutaneously into the abdomen or thigh at least 45 minutes before anticipated sexual activity. The label allows no more than one dose in 24 hours and no more than eight doses per month.
| Form | Dose studied | Regulatory status | Typical onset |
|---|---|---|---|
| Subcutaneous injection (Vyleesi) | 1.75 mg | FDA-approved | About 45 minutes |
| Nasal spray | 10 mg intranasal in older studies | Not approved | 30–60 minutes |
| Unregulated research vials | Unknown and unverified | Not for human use | Unknown |
Anyone looking for a pt-141 peptide dosage chart should know that no at-home dosing schedule has ever been validated outside the approved injection. Likewise, comparing a pt-141 peptide nasal spray to the injection means comparing an FDA-cleared product to a formulation the agency never approved.
Side Effects, Safety Warnings, and Who Should Avoid It
Nausea is the most common side effect, reported by a large share of participants in clinical trials. Flushing, headache, vomiting, and injection-site reactions are also common.
More serious considerations matter too:
- Transient increases in blood pressure and heart rate after each dose.
- Focal hyperpigmentation — dark patches on skin, gums, or nails — with repeated use.
- Contraindication in people with uncontrolled high blood pressure or known cardiovascular disease.
- Not recommended during pregnancy or breastfeeding.
Because PT-141 affects blood pressure, people taking antihypertensive medication should talk with a clinician before using it. Drinking alcohol may make nausea worse.
PT-141 is a prescription medicine in the United States, and unregulated peptide products sold online are not tested for purity, dose accuracy, or sterility.
Buying PT-141 in the US: Reviews, Price, and Legal Reality
PT-141 is a prescription drug, so it cannot legally be sold as a supplement, on Amazon, or as a research chemical intended for human use. Listings that promise otherwise are offering an unapproved product with no guarantee of identity, dose accuracy, or sterility.
Cash prices for the brand autoinjector typically run into the hundreds of dollars per package, and insurance coverage varies widely. A pt-141 peptide price that looks unusually low online is usually a sign of an unregulated vial, not a bargain.
Reading pt-141 peptide reviews can also mislead, because many reviews blend results from compounded injections, nasal sprays, and research-grade powders with no independent verification. The safer path is a licensed clinician who can review blood pressure, current medications, and contraindications before prescribing anything.
Bremelanotide is not FDA-approved for men or for nasal use, and it cannot be purchased legally in the United States without a prescription.
Frequently Asked Questions
Is PT-141 FDA-approved?
Bremelanotide is FDA-approved under the brand name Vyleesi for acquired, generalized hypoactive sexual desire disorder in premenopausal women. It is not approved for men, for postmenopausal women, or as a nasal spray. Any product marketed as PT-141 for those uses is being sold outside FDA approval.
How long does PT-141 take to work?
The approved injection is given at least 45 minutes before anticipated sexual activity, and many users report effects within one to two hours. Effects can last for several hours afterward. It is not a daily medication — the label caps use at one dose per 24 hours and no more than eight doses per month.
Can I buy PT-141 online without a prescription?
No. PT-141 is a prescription-only medicine in the United States, so legitimate sellers require a prescription. Vials marketed as research chemicals are not FDA-approved for human use and may contain the wrong peptide, an inaccurate dose, or bacterial contamination. Talk with a licensed healthcare professional before using any product sold as PT-141.
This page provides educational research information and does not replace medical advice, diagnosis, or treatment.