PT-141
A shot an hour before sex that switches on desire itself, in men and women. Works when pills don't; nausea and blood pressure are the price.
What it is
PT-141 is for the person whose problem is wanting, not working. It acts on the brain's arousal circuit rather than on blood flow, so it does something for women and for men who already have a working erection but no interest. It is taken as needed, about an hour before, never daily.
Who actually uses it: women whose desire has gone flat, often in a long relationship; men on TRT or in their 50s who can perform fine but feel nothing; and couples who want to be on the same page on a given night. It is a close cousin of Melanotan II (it is one of its breakdown products) with the tanning and most of the appetite effect stripped out. There is an approved version, Vyleesi, for low desire in premenopausal women, which is why the human data here is better than for almost anything else in this category.
What you feel: about 45 minutes to two hours in, a background hum of interest that builds, more sensitivity, and in men often spontaneous erections through the evening. Women describe it as wanting to be touched rather than tolerating it. The window lasts several hours and can carry into the next morning. Before any of that, the side effects arrive first: flushing, a queasy stomach for 20 to 30 minutes, and sometimes a headache. The nausea is real; in the Vyleesi trials about four in ten women had it, and a few vomited. It does not create attraction to someone you are not attracted to, and it does nothing for a purely plumbing problem, which is what Viagra is for.
How to run it: subQ in the belly fat, 200 mcg the first time, on an empty-ish stomach, with a quiet evening planned in case the nausea wins. If 200 mcg gave you the effect with manageable nausea, that is your dose. Most settle at 500 mcg; some tolerate up to 1 mg. The approved pen is 1.75 mg, so our tiers are deliberately below it. Never more than once in 24 hours and not more than a couple of times a week; the pigment and blood pressure effects stack with frequency. The common mistakes are dosing too late (it needs the hour), dosing after a big meal or drinks (the nausea doubles), and taking it daily to 'build up', which only builds up darker freckles.
The evidence is unusually strong for this corner of the site: two large placebo-controlled trials in women drove the approval, with a modest but real increase in satisfying sexual events and desire scores. In men, earlier studies with a nasal version showed clear erectile and desire effects but were shelved over blood pressure. So the desire effect is proven, the blood pressure effect is proven, and the men's use runs on that older data plus a lot of real-world use.
Skip it if you have uncontrolled high blood pressure, any heart disease, or you are pregnant; if you get migraines easily, expect it to trigger one. If the problem is a lack of closeness rather than a lack of desire, oxytocin is the gentler, in-the-moment option, and some people use the two together. If you want the tan and the desire in one shot, the PT-141 + Melanotan 2 blend exists, but it carries both sets of side effects.
What people use it for
Desire in women
Most evidenceTwo large placebo-controlled trials in premenopausal women with low desire led to FDA approval of bremelanotide (Vyleesi) in 2019. Desire scores rose and distress fell versus placebo; the effect was real but modest on average, with some women responding strongly and others not at all. Nausea was the most common reason to quit.
Arousal and erections in men
Some evidenceEarlier studies of bremelanotide in men, mostly with a nasal spray, showed increased erections and desire, including in men who did not respond to sildenafil. Development for men stopped over blood pressure rises, not lack of effect. Men's use today runs on that older data and a lot of field experience.
Blood pressure and nausea
Most evidenceThe trials documented a short rise in blood pressure, a few points, peaking a couple of hours after the shot and gone by the next day, plus nausea in roughly four in ten women. These are not rare side effects; they are the expected ones, and the reason for the once-in-24-hours rule and the heart-disease exclusion.
Skin darkening
Some evidenceBecause it comes from the melanocortin family, frequent use darkens freckles, moles and the face or gums in a minority of users. In the trials it was more common with daily dosing. Keep use occasional and watch your moles.
How it works
Where PT-141 sits among the melanocortins
- Approved for one specific use: low sexual desire in some women (Vyleesi)
- Works through the brain rather than blood flow, so it differs from ED pills
- Nausea and temporary flushing or blood-pressure changes can occur
- Other uses are off-label and less studied
How people use it
Safety, in brief
Things people sometimes notice
- Nausea for 20 to 30 minutes, sometimes longer, especially after food or alcohol
- Flushing in the face and chest within the first half hour
- A headache, or a migraine if you are prone to them
- A small rise in blood pressure for a few hours; you will not feel this one
The full picture — stop signs and who should talk to a doctor first — is on the dosing guide.
Sources
The labels and studies behind this page. Each link opens the original on PubMed, DailyMed or ClinicalTrials.gov.
- Vyleesi (bremelanotide) prescribing information
- Bremelanotide for the Treatment of Hypoactive Sexual Desire Disorder: Two Randomized Phase 3 Trials
- Salvage of sildenafil failures with bremelanotide: a randomized, double-blind, placebo controlled study
- Safety Profile of Bremelanotide Across the Clinical Development Program