PT-141 Calculator
Convert a dose of PT-141 into syringe units. Enter the vial size, the bacteriostatic water added and the dose on your prescription.
Enter the vial size and the water you added.
Arithmetic only. This tool does not recommend a dose; use the one your prescriber gave you.
About PT-141 (bremelanotide)
PT-141 (bremelanotide) is a melanocortin receptor agonist.
FDA-approved as a prescription medicine (Vyleesi), supplied as a pre-filled autoinjector.
Vyleesi is a single-use pre-filled autoinjector. It is not reconstituted and involves no syringe arithmetic. This calculator applies only to bremelanotide dispensed as a powder vial.
PT-141 concentration chart
Concentration for a 10 mg vial at 1, 2, 3 and 5 mL of water, with the amount held in every 10 units of a U-100 syringe.
| Vial | 1 mL water | 2 mL water | 3 mL water | 5 mL water |
|---|---|---|---|---|
| 10 mg | 10 mg/mL · 1 mg per 10 units | 5 mg/mL · 0.5 mg (500 mcg) per 10 units | 3.333 mg/mL · 0.3333 mg (333.3 mcg) per 10 units | 2 mg/mL · 0.2 mg (200 mcg) per 10 units |
Units per 1 mg of PT-141
How many units on a U-100 syringe hold 1 mg, for each vial size and water volume. 1 mg is a round reference amount for scaling, not a dose: multiply or divide to match the dose on your prescription, or use the calculator.
| Vial | 1 mL water | 2 mL water | 3 mL water | 5 mL water |
|---|---|---|---|---|
| 10 mg | 10 units | 20 units | 30 units | 50 units |
Questions
How do I calculate PT-141 units on a syringe?
Divide the mg in the vial by the mL of water added to get mg/mL. Divide your prescribed dose by that figure for mL, then multiply by 100 for units on a U-100 syringe. For example, a 10 mg vial with 2 mL of water is 5 mg/mL, so every 10 units holds 0.5 mg (500 mcg).
How many units is 1 mg of PT-141?
It depends on the vial size and the water added. With a 10 mg vial, 1 mg is 10 units after 1 mL of water, 20 units after 2 mL of water, 30 units after 3 mL of water. The lookup table above covers the other vial sizes.
Is PT-141 measured in mg or mcg?
PT-141 vials are labelled in mg. If your prescription is written in mcg, divide by 1,000 to get mg, or switch the dose field to mcg. In a 10 mg vial mixed with 2 mL, one unit on the syringe holds 0.05 mg (50 mcg).
Does this calculator apply to the Vyleesi autoinjector?
Vyleesi is a single-use pre-filled autoinjector. It is not reconstituted and involves no syringe arithmetic. This calculator applies only to bremelanotide dispensed as a powder vial.
How much bacteriostatic water do I add to PT-141?
Follow the amount on your pharmacy label. The volume of water does not change how much PT-141 is in the vial; it only changes how many units a given dose takes up. Enter whatever amount was actually added.
What PT-141 dose should I enter?
The dose written on your prescription. This page converts a dose into syringe units and does not recommend one.
Related conversions
- 10 units to mg
- 60 units to mg
- 10 units to mL
- 0.25 mL to units
- mcg to mg
- mg/mL to units chart
- All conversions
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