CalcKitHome›Health & Fitness›PT-141 dosage
PT-141 Dosage Calculator
Your PT-141 vial
1 mg = 1,000 mcg. The dose volume in mL and the insulin syringe units are worked out from the concentration of your reconstituted vial.
Estimate only, not medical advice. Peptides are research compounds; dosing must come from a licensed clinician.
Example: a 10 mg vial reconstituted with 2 mL of water gives 5,000 mcg/mL, so a 1,500 mcg dose is 0.30 mL — 30 units on an insulin syringe — with about 6.7 doses per vial.
Behind the numbers
How PT-141 dosing is calculated
A peptide vial holds a dry powder measured in milligrams. Adding bacteriostatic water dissolves it, and the concentration tells you how many micrograms are in each millilitre. Once you know the concentration, any dose is a simple division: dose in mcg divided by mcg per mL gives the volume in mL. On a standard insulin syringe, 1 mL equals 100 units, so multiply the volume by 100 to get the units.
10 mg × 1,000 ÷ 2 mL = 5,000 mcg/mL. Then 1,500 mcg ÷ 5,000 mcg/mL = 0.30 mL, and 0.30 mL × 100 = 30 units.
Common PT-141 doses at 5,000 mcg/mL
Based on a 10 mg vial reconstituted with 2 mL of water (5,000 mcg/mL). Change the vial size or the water above and the volumes change with it.
A few comparisons
Example doses
| Vial | Water | Dose | Concentration | Volume | Units | Doses per vial |
|---|---|---|---|---|---|---|
| 10 mg | 2 mL | 1,500 mcg | 5,000 mcg/mL | 0.30 mL | 30 | 6.7 |
| 10 mg | 2 mL | 1,000 mcg | 5,000 mcg/mL | 0.20 mL | 20 | 10 |
| 10 mg | 3 mL | 1,500 mcg | 3,333 mcg/mL | 0.45 mL | 45 | 6.7 |
| 5 mg | 2 mL | 1,500 mcg | 2,500 mcg/mL | 0.60 mL | 60 | 3.3 |
| 10 mg | 2 mL | 2,000 mcg | 5,000 mcg/mL | 0.40 mL | 40 | 5 |
Measure twice, draw once.
Always double-check the vial label before you type anything in — a 5 mg vial and a 10 mg vial give very different concentrations at the same water amount.
More water means a lower concentration and a larger draw for the same dose, which can make small doses easier to measure accurately.
On an insulin syringe, 100 units = 1 mL. A 0.30 mL dose is 30 units; mixing up units and millilitres is the most common measuring mistake.
Keep the reconstituted vial refrigerated and follow your supplier’s storage guidance, and never use a dose worked out here without a licensed clinician’s direction.
Good to know
Your dosage questions, answered.
What is PT-141?
PT-141 (bremelanotide) is a research peptide. This calculator only does the reconstitution math for a vial — it does not recommend a dose, a schedule or a use.
How do I work out the dose volume?
First find the concentration: vial amount in mg × 1,000 ÷ water in mL. Then divide your dose in mcg by that concentration. For example, 10 mg in 2 mL is 5,000 mcg/mL, so a 1,500 mcg dose is 1,500 ÷ 5,000 = 0.30 mL.
What if my vial size is different?
Type your own numbers into the fields — every input here is a number field, so any vial size, water amount or dose works. The concentration, volume, units and doses per vial all update from your numbers.
Is this medical advice?
No. This page is an estimate only, not medical advice. Peptides are research compounds; dosing must come from a licensed clinician.