How many units is each PT-141 amount?
At 10 mg + 2 mL (5 mg/mL) on a U-100 syringe:
Generated from the calculator's own functions. Rows are evenly spaced reference amounts, not suggested amounts. Amber readings don't fit a 100-unit barrel.
| Amount | mcg | Volume (mL) | Syringe units |
|---|---|---|---|
| 0.25 mg | 250 | 0.05 | 5 |
| 0.5 mg | 500 | 0.1 | 10 |
| 0.75 mg | 750 | 0.15 | 15 |
| 1 mg | 1,000 | 0.2 | 20 |
| 1.25 mg | 1,250 | 0.25 | 25 |
| 1.5 mg | 1,500 | 0.3 | 30 |
| 1.75 mg | 1,750 | 0.35 | 35 |
| 2 mg | 2,000 | 0.4 | 40 |
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How much water for each PT-141 vial size?
PT-141 is sold in one common size (10 mg). The same water volume gives a different concentration in each, so the same reading means a different amount. Each cell shows mcg per unit with mg/mL in brackets.
| Vial | 1 mL | 2 mL | 3 mL | 5 mL |
|---|---|---|---|---|
| 10 mg | 100 (10) | 50 (5) | 33.33 (3.33) | 20 (2) |
How much bacteriostatic water for a 10 mg PT-141 vial?
1 mL → 10 mg/mL, so 1 mg is 10 units. 2 mL → 5 mg/mL, so 1 mg is 20 units. 3 mL → 3.33 mg/mL, so 1 mg is 30 units. The whole vial holds 10 draws of 1 mg.
Worked example: 10 mg vial, 2 mL, 1 mg
- Concentration. 10 mg ÷ 2 mL = 5 mg/mL (5,000 mcg/mL).
- Volume. 1 mg ÷ 5 mg/mL = 0.2 mL.
- Units. 0.2 mL × 100 = 20 units on a U-100 syringe.
- Check. One unit holds 50 mcg; 20 × 50 mcg = 1,000 mcg = 1 mg, which matches. The vial holds 10 draws of this size.
PT-141: notes for the arithmetic
If you have the prescription autoinjector, there is nothing to calculate: it is single-dose and prefilled, so follow its label. This page is only for vials that need water added. A 10 mg vial in 2 mL is 5 mg/mL, so 1 mg is 20 units.
For the lab procedure itself (materials, aseptic technique, mixing without foaming) see how to reconstitute peptides. For what bacteriostatic water is and how long an opened vial is kept, see the bacteriostatic water guide and the storage guide.
Frequently asked questions
How many units is 1 mg of PT-141?
It depends on the water volume. 10 mg + 2 mL = 5 mg/mL, so 1 mg is 0.2 mL, or 20 units on a U-100 syringe. With 1 mL instead it would be 10 units.
How much bacteriostatic water for a 10 mg PT-141 vial?
There is no single correct volume. 1 mL gives 10 mg/mL (100 mcg per unit); 2 mL gives 5 mg/mL (50 mcg per unit); 3 mL gives 3.33 mg/mL (33.33 mcg per unit). Pick the volume that makes your reading easy to measure on the barrel you have.
How many mg of PT-141 is 10 units?
10 units on a U-100 syringe is 0.1 mL. At 5 mg/mL (10 mg in 2 mL) that is 0.5 mg (500 mcg). At a different concentration the answer is different.
Is this a PT-141 dosing calculator?
It is an arithmetic tool. It converts an amount you enter into a volume and a syringe reading; it does not suggest amounts, schedules or uses. Bremelanotide is FDA-approved only as Vyleesi, a prefilled autoinjector for premenopausal women with acquired, generalized hypoactive sexual desire disorder (HSDD). Research-labeled PT-141 vials are not that product and are not FDA-approved.
Sources
- NDA 210557 approval letter: Vyleesi (bremelanotide) subcutaneous injection
- FDA alerts health care providers, compounders and patients of dosing errors associated with compounded injectable semaglutide products
Links checked 2026-10-19.