Oral PT-141 Does Not Work According to Science

This may surprise you, as it surprised me. A few months back we became very interested in offering PT-141, also known as bremelanotide, at shamelesscare.com. It is one of the most talked-about libido and arousal medications in the country right now, and there is real, FDA-approved science behind it when it is given correctly.

The word “correctly” is doing a lot of work in that sentence.

PT-141 comes in three forms: a subcutaneous injection, a nasal spray, and a sublingual tablet. Only one of these has strong, well-replicated science behind it. One has a reasonable case. And the third one, the form most telehealth companies are excited about, has very little evidence behind it at all.

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What PT-141 Is

PT-141 is the research name for bremelanotide. It is a small ring-shaped peptide that activates receptors in the brain involved in sexual desire and arousal. It is the active ingredient in Vyleesi, which the FDA approved in 2019 for hypoactive sexual desire disorder in premenopausal women.¹

When people talk about “PT-141,” they are talking about this same molecule. The form it comes in is what changes the conversation.

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The Three Forms, Honestly

Subcutaneous Injection

Injectable bremelanotide is the gold standard. It is the only form with full FDA approval, and it has the best clinical data behind it. It also has a real downside: roughly 40 percent of patients in the clinical trials reported nausea, with a meaningful number needing anti-nausea medication or stopping treatment because of it.² That is not a side effect you can wave off as something a few unlucky people experience. It is closer to a coin flip.

It is also expensive. Branded Vyleesi runs several hundred dollars per box at most pharmacies, and even compounded versions from a legitimate sterile pharmacy are not cheap once you factor in the supplies needed to actually inject. The black-market peptide route is much cheaper, but you have no idea what is actually in the vial, and we will not go anywhere near that.

Nasal Spray

Nasal bremelanotide has the longest history of any form of the drug. It was the original route the developer studied, and the FDA’s own label notes that the nasal version produces blood levels comparable to or higher than the injection, although you need a higher dose to get there.¹

Nasal works. It is not perfect. The bioavailability through the nose is lower than through an injection, so the dose has to be larger. The formulation has to be refrigerated, and once it is dispensed it has a relatively short shelf life. There are real reasons to like it and real reasons to dislike it, and reasonable people can land on either side.

We offer the nasal spray because there is real pharmacology behind it. It is not a perfect product, but it is real medicine.

Sublingual Tablet

This is the form you are seeing more and more telehealth companies offer. It is convenient. It is shelf-stable. It is cheap to make. It is also, based on what I have been able to find, very unlikely to be working.

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The Story Behind Our Decision

A compounding pharmacy I had been talking to for months started offering sublingual bremelanotide alongside several other sexual health medications. On paper it seemed like a great addition for our customers. I had several meetings with them and patiently waited for their product to clear their internal testing. I assumed, perhaps naively, that if a licensed pharmacy was producing a medication, there would be evidence behind it.

Our medical director then asked, “What evidence is there that bremelanotide can be absorbed sublingually?”

I went back to the pharmacy and asked one direct question: do you have any data showing that PT-141 actually absorbs sublingually in humans? The answer was no.

I did not want to give up. The convenience of a tablet is enormous. So I did some research of my own, and what I found was worse than “no data.” I found science pointing in the opposite direction.

I then contacted a second compounding pharmacy that was selling a sublingual bremelanotide product. I spoke with one of their pharmacists, someone with a doctorate in pharmacy. When I asked the same question, she told me confidently that the data existed. She said she would send it.

She never did. I followed up. Nothing came back. I now believe the simplest explanation is that the data does not exist.

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Why Sublingual PT-141 Probably Does Not Work

The science here is not complicated, and you do not need a pharmacology degree to follow it.

The lining inside your mouth, including the tissue under your tongue, is good at letting small drug molecules through. That is why nitroglycerin works under the tongue for chest pain. It is why some forms of fentanyl and a handful of other small-molecule drugs are designed for sublingual use. Those medicines all share a common feature. They are small molecules.

Peptides are not small molecules. They are larger and more complex, and the larger they get, the harder it is for them to cross the lining of the mouth in any useful amount. Researchers have known this for decades, which is why the field of peptide drug delivery exists in the first place. When pharmaceutical companies want to make a peptide work through the mouth, they have to engineer the formulation specifically for that purpose, with special ingredients designed to help the peptide cross the tissue. A simple compounded sublingual tablet is not that.

Bremelanotide is on the larger end of the peptide spectrum, and it is the kind of molecule that, on basic chemistry, you would not expect to absorb well through the mouth without specialized formulation help.

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The Beagle Study

The other piece of evidence is more direct. In 2020, a research group in Germany set out to figure out whether bremelanotide could be developed as an oral drug. They used dogs and a very sensitive measurement technique designed to pick up even tiny amounts of the drug in the blood. After giving bremelanotide by mouth, they reported that the result was minimal absorption.³

That is the only published study I have been able to find that directly tested whether oral bremelanotide gets into the bloodstream. The answer was no, or close enough to no that it would not be useful as a medicine.

If a healthy beagle on a controlled study cannot absorb a meaningful amount of bremelanotide when it is fed to them, a person letting a tablet dissolve under their tongue for a couple of minutes is unlikely to do better.

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What This Taught Me

The lesson I took away is one I think more people in this industry should hear out loud. A licensed pharmacy is, in the end, also a business. If a doctor is willing to write a prescription, in many cases the pharmacy will compound and sell it. Having a credentialed pharmacist on the other end of the phone is reassuring, but it does not, by itself, mean there is good evidence behind the product they are selling.

I am not angry at either of the pharmacies I spoke with. They are not doing anything illegal. But I came away from those conversations with a clearer view of where my responsibility actually sits, which is between what the science says and what we put our customers’ names on.

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What We Offer Instead

We do not offer sublingual bremelanotide. We do offer the nasal spray version, which has decades of clinical history and a real pharmacological case behind it. The nasal route is not perfect, but it is real medicine, and we feel good about offering it.

If the science changes, we will revisit the sublingual option. As of right now, we cannot in good conscience put it on the site.

That is the difference, in my mind, between a medicine and a marketing decision.

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Frequently Asked Questions

Does oral or sublingual PT-141 work?

Almost certainly not in any meaningful way. The molecule is too large to cross the lining of the mouth without specialized formulation, and the only published study to test the question, in beagle dogs, found minimal absorption.³

Is sublingual bremelanotide FDA-approved?

No. The only FDA-approved form of bremelanotide is Vyleesi, which is a subcutaneous injection.

Why do some telehealth companies still sell sublingual PT-141?

Compounded medications operate under different rules than FDA-approved drugs. A licensed compounding pharmacy can legally produce a formulation that has not been studied for efficacy, as long as a licensed prescriber writes the prescription. That does not mean the product works.

What about the nausea with the injection?

The FDA-approved label for Vyleesi reports that about 40 percent of patients experience nausea, and a meaningful percentage of patients either need anti-nausea medication or stop treatment because of it.² It is a real side effect that anyone considering the medication should be aware of.

Is the nasal spray a better option than the injection?

It depends on the person. The nasal spray has more flexibility and avoids the needle, but the dose has to be higher because the absorption is lower. Some people prefer it. Others find the injection easier. Both have legitimate scientific footing.

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1. U.S. Food and Drug Administration. *VYLEESI (bremelanotide injection) Prescribing Information.* 2019. https://www.accessdata.fda.gov/drugsatfda_docs/label/2019/210557s000lbl.pdf ↩︎
2. VYLEESI Healthcare Professional Site. Safety profile, including nausea incidence and discontinuation rates. https://vyleesipro.com/vyleesi-safety ↩︎
3. Klingler FM, et al. Ultra-sensitive quantification of the therapeutic cyclic peptide bremelanotide utilizing UHPLC-MS/MS for evaluation of its oral plasma pharmacokinetics. *Journal of Pharmaceutical and Biomedical Analysis*, 2020. https://pubmed.ncbi.nlm.nih.gov/32353679/
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