PT-141 Dosage Calculator
This PT-141 dosage calculator converts a bremelanotide dose into the units to draw on a syringe. PT-141 is where the milligram and microgram worlds collide: the vial is labelled in milligrams, the approved pen holds 1.75 mg, and half the amounts quoted online are in micrograms. Enter the vial, the water and your dose, and get the exact units.
Units measure volume, not dose. The same units on a different mix are a different dose.
The link holds only the numbers you typed. No account, no tracking, nothing else.
On this page
PT-141 dosage calculator table: dose to units for the common mixes
Three amounts, five mixes. The 1.75 mg column is the amount in the approved prescription pen, included because people converting from the pen to a vial need it in units like any other amount. Between the weakest and strongest mixes here, the same amount swings by a factor of four.
| Vial | Water | Concentration | 0.5 mg draw | 1 mg draw | 1.75 mg draw |
|---|---|---|---|---|---|
| 5 mg | 1 mL | 5 mg/mL | 10 units | 20 units | 35 units |
| 5 mg | 2 mL | 2.5 mg/mL | 20 units | 40 units | 70 units |
| 10 mg | 1 mL | 10 mg/mL | 5 units | 10 units | 17.5 units |
| 10 mg | 2 mL | 5 mg/mL | 10 units | 20 units | 35 units |
| 10 mg | 3 mL | 3.33 mg/mL | 15 units | 30 units | 52.5 units |
Look at the 1 mg column. It runs from 10 units to 40 depending on nothing but the vial and the water. A unit number quoted without a mix is meaningless for PT-141 exactly as it is for every other compound.
Two forms of PT-141: pen and powder
Bremelanotide exists in two forms that share a name and nothing else. Vyleesi, the approved prescription brand, is a single-dose autoinjector holding 1.75 mg. There is no water, no mixing and no units to draw: the pen holds one fixed amount. It was approved in 2019 for one specific condition in premenopausal women. Research suppliers sell the same compound name as loose powder in 5 and 10 mg vials. Only one of those two forms is an approved medicine, and the methodology page records which is which.
For the arithmetic, the label is all that matters. A 5 mg vial and a 10 mg vial are both just a number of milligrams waiting for water, and the calculator above takes either, including amounts that are not in its preset list. Read the amount off the vial in front of you rather than assuming the size.
Common questions
How many units is 1 mg of PT-141?
It depends on the mix. In a 10 mg vial with 2 mL of water (5 mg per mL), 1 mg is 20 units. The same vial with 1 mL of water is twice as strong, so 1 mg is 10 units. In a 5 mg vial with 2 mL (2.5 mg per mL), 1 mg is 40 units. The table above covers the common mixes.
How much BAC water do I add to a 10 mg PT-141 vial?
Your choice, and the water sets how big the draw is. For a 1 mg amount: with 1 mL of water the draw is 10 units, with 2 mL it is 20 units, and with 3 mL it is 30 units. The amount is 1 mg every time. Pick the mix that puts your amount on a mark you can read easily, or work backwards from the draw you want with the reconstitution calculator.
Is PT-141 measured in mg or mcg?
Both, which is exactly the problem. The vial is labelled in milligrams, the approved pen holds 1.75 mg, and many amounts quoted online are in micrograms: 500 mcg is 0.5 mg. Type 500 into a field set to mg and the answer comes out a thousand times too big. This calculator starts in mg for PT-141 and shows the dose back in both units so you can check it.
How many doses are in a 10 mg vial of PT-141?
At 1 mg an amount, ten. At 0.5 mg, twenty. At the pen amount of 1.75 mg, five full amounts with 1.25 mg left over. It is just the vial amount divided by the dose, and the water has nothing to do with the count. The calculator shows the count for your own numbers as you type.
What is the difference between Vyleesi and PT-141 vials?
Vyleesi is the approved prescription brand of bremelanotide: a single-dose autoinjector holding 1.75 mg, approved in 2019 for one specific condition in premenopausal women. There is nothing to mix and nothing to draw. PT-141 powder vials are research products in 5 and 10 mg sizes, and they are not approved medicines. The compound name is the same, so the arithmetic is the same: enter the amount printed on your vial. The methodology page records the regulatory position properly.
Arithmetic only
This calculator does maths on the numbers you enter. It works out concentration, draw volume and syringe units from the vial amount and water volume you give it. Nothing more.
It does not recommend amounts, schedules or products, and it does not know what is in your vial. It uses the amount printed on the label. If the label and the actual contents differ, the result differs too. For medical questions, talk to a clinician.
How the maths works, and where the facts on this site come from: Methodology and sources.
Report an error or ask a question
Found a wrong number on this page, or stuck on the maths? Send a correction or a question here. Confirmed errors get fixed and written into the change log on the Methodology page.