PT-141 Reconstitution & Dosage Calculator
This free PT-141 calculator turns your vial size, the bacteriostatic water you add, and your target amount into a concentration, a draw volume, and the exact units on a U-100 insulin syringe. PT-141 (Bremelanotide) is a melanocortin receptor agonist handled in small milligram amounts. It works in both milligrams and micrograms and is an educational research-planning tool only.
PT-141 reconstitution calculator
Syringe
U-100 insulinPeptide in vial
Target amount
Bacteriostatic water
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Quick summary
- Converts vial size (mg), bacteriostatic water (mL), and target amount into concentration, draw volume, and U-100 units.
- Reference math for the 5 and 10 mg vials PT-141 is commonly supplied in.
- Educational research and measurement tool only — it does not diagnose, treat, or recommend an amount.
What this PT-141 calculator does
This calculator does one job well: it turns your vial size, the amount of bacteriostatic water you add, and your target amount into a concentration (mg/mL), a draw volume (mL), and the matching units on a U-100 insulin syringe. Change any input and the result updates instantly.
PT-141 ships as a freeze-dried powder. Before it can be measured into a syringe it has to be reconstituted — dissolved in bacteriostatic water. How much water you add sets the concentration, and the concentration sets how many units each amount works out to. The presets above cover the most common PT-141 vial setups; use the custom fields for anything else.
How to use the PT-141 calculator
Pick your syringe
Choose the U-100 insulin syringe you'll draw with. Smaller syringes (0.3 mL / 30u) have finer lines, which helps when the draw is small.
Enter your vial and water
Set the milligrams in your PT-141 vial and the bacteriostatic water you added. Together these set the concentration.
Set your target amount
Toggle mg or mcg and pick (or type) the amount you're measuring for. The calculator does the conversion for you.
Read the draw
The result panel shows concentration, draw volume, and the exact U-100 units to pull, plus how many doses your vial contains.
PT-141 reconstitution math, explained
The math is short. Concentration = vial size ÷ bacteriostatic water. Draw volume = target amount ÷ concentration. Units = draw volume × 100 (a U-100 syringe reads 100 units per mL). The table below shows common PT-141 setups and the units for a 1 mg amount at each.
| Vial size | Bac water | Concentration | Units per 1 mg |
|---|---|---|---|
| 10 mg | 1.0 mL | 10 mg/mL | 10 units |
| 10 mg | 2.0 mL | 5 mg/mL | 20 units |
| 10 mg | 2.5 mL | 4 mg/mL | 25 units |
| 5 mg | 1.0 mL | 5 mg/mL | 20 units |
| 5 mg | 2.0 mL | 2.5 mg/mL | 40 units |
PT-141 amount-to-units reference
How common amounts convert to U-100 syringe units at two example concentrations. These are arithmetic conversions for reference, not a recommendation of any amount.
| Amount | Volume (mL) | U-100 units |
|---|---|---|
| 0.5 mg (500 mcg) | 0.10 mL | 10 units |
| 1 mg (1000 mcg) | 0.20 mL | 20 units |
| 1.5 mg (1500 mcg) | 0.30 mL | 30 units |
| 2 mg (2000 mcg) | 0.40 mL | 40 units |
| Amount | Volume (mL) | U-100 units |
|---|---|---|
| 0.5 mg (500 mcg) | 0.05 mL | 5 units |
| 1 mg (1000 mcg) | 0.10 mL | 10 units |
| 1.5 mg (1500 mcg) | 0.15 mL | 15 units |
| 2 mg (2000 mcg) | 0.20 mL | 20 units |
Mixing, color & storage tips
Pick a concentration that reads cleanly
At 5 mg/mL a 1 mg target lands on exactly 20 units, which is easy to read. At 10 mg/mL the same amount is only 10 units, so small errors matter more. More water gives a larger, more readable draw.
mg vs mcg
PT-141 references use both scales. 1 mg = 1000 mcg, so a 1000 mcg entry and a 1 mg entry produce an identical draw. The calculator accepts either.
Mixing without foam
Add the bacteriostatic water slowly down the inside wall of the vial rather than onto the powder, then swirl gently until dissolved. Do not shake.
Storage and vial life
Keep the dry powder cold and dark. After reconstitution, refrigerate, keep it out of light, and plan around a limited usable window. Do not freeze a reconstituted vial.
PT-141 supplies checklist
A simple reconstitution shopping list. Confirm vial size and batch documentation before you buy.
PT-141
- Batch COA on every vial
- Third-party purity tested
- U.S. fulfillment, discreet shipping
PT-141 — frequently asked questions
What does this PT-141 calculator tell me?
It converts your vial size, bacteriostatic water volume, and target amount into concentration in mg/mL, draw volume in mL, and the matching units on a U-100 insulin syringe. It is a measurement tool, not a recommendation.
Is the PT-141 calculator free?
Yes. It runs entirely in your browser, is free, and requires no account or signup.
How much bacteriostatic water do I add to a 10 mg PT-141 vial?
That depends on the concentration you want. 10 mg with 2 mL makes 5 mg/mL, so a 1 mg target is 20 units. Using 1 mL makes 10 mg/mL and the same amount is 10 units — a smaller, harder-to-read draw.
How many units is 1 mg of PT-141?
At 5 mg/mL it is 20 units (0.2 mL). At 10 mg/mL it is 10 units (0.1 mL). Units always depend on your specific concentration.
Is PT-141 the same as Bremelanotide?
Yes. PT-141 is the research designation for bremelanotide, a melanocortin receptor agonist.
Is PT-141 FDA-approved?
Bremelanotide is approved as a prescription drug under the brand name Vyleesi for a specific medical indication. Research-grade PT-141 sold as a research chemical is not that product and is supplied research-use-only, not for human or veterinary use.
Is this medical advice?
No. This page and calculator are for education and research planning only. They do not diagnose, treat, or recommend an amount.
