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Prescription drug Published: RCT evidence Extensive real-world use

PT-141: dosing, reconstitution and evidence

A melanocortin receptor agonist and FDA-approved treatment for hypoactive sexual desire disorder in premenopausal women. Acts centrally on desire pathways rather than on blood flow, unlike PDE5 inhibitors.

Also known as Bremelanotide, Vyleesi

Educational research reference Sexual Health
Quick reference. Everything you need to run PT-141 — dosing, frequency, reconstitution math for the vial sizes people actually buy, and what it stacks with. For anything specific to your situation, ask the Guru.

PT-141 quick start

Route
SubQ
Typical dose
0.5–2 mg (approved dose 1.75 mg)
Frequency
As needed, max 1 dose/24 h and 8/month
Half-life
About 2.7 hours.
Cycle
As needed, not daily.
Vial sizes sold
10mg or 5mg
These are the numbers people actually run, drawn from the published record and from what the community has settled on over time. Educational reference, not medical advice — a starting point to work from, and one you can adjust as you learn how you respond.

How to run it

How often
As needed, max 1 dose/24 h and 8/month
Cycle length
As needed, not daily.
Half-life
About 2.7 hours.
Route
SubQ
Consistency matters more than perfect timing. Pick a slot in your day you will actually keep, and let DoseIQ handle the rest.

For women

The one peptide FDA-approved FOR women: Vyleesi, 1.75 mg SC for premenopausal low desire (max one dose/24 h, eight/month). Compounded use titrates 0.5–2 mg. Nausea is the dominant side effect. Not approved in Canada.

What people actually run

Widely used. Community consensus is to start well below the approved dose because of nausea.

This is accumulated community practice — years of real-world use across a large number of people, converging on numbers that work. It is not a controlled trial, and for most compounds here no such trial exists or is ever likely to. That makes this the most reliable dosing signal available, and it is a good deal better than guessing.

What to expect

Most people tolerate PT-141 well. Here is what is worth knowing going in, so nothing catches you by surprise.

Nausea is very common — the dose-limiting effect for most people. Causes transient blood pressure increases; contraindicated in uncontrolled hypertension or cardiovascular disease. Can cause facial and gum darkening with repeated use. Do not exceed one dose per 24 hours.

Known interactions

Interactions involving PT-141's drug class that DoseIQ screens for. Each one cites where it comes from — an FDA label section or the published record — because an interaction warning you can't trace is just noise.

Caution SSRIs + melanocortins (PT-141, MT-2) — central overlap

Both act centrally; the community reports stronger nausea and blunted or altered response on the combination.

What to do: Start at the low end of melanocortin dosing and judge your own response.

Source: Community reports; melanocortin pharmacology

Caution Photosensitizing medication + tanning peptides

Melanotan use usually means deliberate UV exposure — on doxycycline or isotretinoin, that same exposure burns much faster.

What to do: Pause the deliberate sun exposure for the course, or accept much shorter sessions.

Source: FDA labels, doxycycline/isotretinoin (photosensitivity)

DoseIQ screens your whole protocol against these rules automatically — every compound, prescription and supplement you track, cross-checked as you add them. Serious flags are always free.

Reconstitution guide

PT-141 ships as a lyophilised powder and gets mixed with bacteriostatic water before use. How much water you add sets the concentration, which sets how many syringe units make up each dose. One unit on a U-100 syringe is 0.01 mL — the tables below do the arithmetic for the vial sizes you are most likely to be holding.

10mg vial most common

Water addedConcentration 0.5mg2mg
2mL (common) 5 mg/mL0.10 mL
10 units		0.40 mL
40 units
3mL 3.33 mg/mL0.15 mL
15 units		0.60 mL
60 units

5mg vial

Water addedConcentration 0.5mg2mg
2mL (common) 2.5 mg/mL0.20 mL
20 units		0.80 mL
80 units
3mL 1.67 mg/mL0.30 mL
30 units		1.20 mL
120 units *

* More than 100 units — that is more than a single U-100 insulin syringe holds. Either use a larger syringe, split it across two draws, or mix with less water to concentrate it. Adding less water is usually the easier fix.

10 mg vial + 1 mL BAC water = 10 mg/mL — a 1 mg dose = 10 units on a U-100 syringe. 5 mg vial + 1 mL = 5 mg/mL — 1 mg = 20 units.

Standard steps

  1. Inspect the vialConfirm the label and that the powder cake is intact. Do not use a cracked or compromised vial.
  2. Let it reach room temperatureSitting out for a few minutes reduces condensation inside the vial when the seal is broken.
  3. Disinfect both stoppersWipe the compound vial and the bacteriostatic water vial with a fresh alcohol swab and let them air-dry.
  4. Draw the bacteriostatic waterUse a sterile syringe to draw the volume you have chosen from the reconstitution table.
  5. Add the water down the vial wallInject slowly so it runs down the inside wall rather than spraying directly onto the powder. This limits foaming.
  6. Dissolve gentlySwirl or roll the vial between your hands until the cake dissolves. Never shake — agitation damages peptide bonds. The solution should end up clear.
  7. Label and refrigerateWrite the reconstitution date and concentration on the vial. Store at 2–8°C. Do not freeze.
Running a different vial size or water volume? The DoseIQ calculator works it out for any combination — mcg, mg or IU, on any syringe size.
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This page is an educational research reference and is not medical advice. Dose figures reflect the published record and what the community has converged on — starting points to weigh, not instructions. Consult a qualified healthcare provider before starting any protocol.