PT-141 Dosage Calculator: Reconstitution and Units

To calculate PT-141 dosage, divide your target dose (mg) by the vial concentration. For a 10 mg vial with 2 mL BAC water: concentration is 5 mg/mL. A 1 mg dose equals 0.2 mL (20 U-100 units). A 2 mg dose equals 0.4 mL (40 U-100 units) on a standard insulin syringe.

Example PT-141 Dosage Table

Common vial and BAC water combinations with calculated concentration, draw volume, and U-100 syringe units. For education only — verify your vial label before use.

Vial (mg)BAC water (mL)ConcentrationDose (mg)Draw (mL)U-100 units
10 mg2 mL5 mg/mL0.5 mg0.1 mL10 units
10 mg2 mL5 mg/mL1 mg0.2 mL20 units
10 mg2 mL5 mg/mL1.5 mg0.3 mL30 units
10 mg2 mL5 mg/mL2 mg0.4 mL40 units

How to Calculate PT-141 Dosage

Three steps convert any vial and BAC water combination into the exact volume to draw on a U-100 insulin syringe.

  1. Step 1 — Calculate concentration (mg/mL)

    Divide the total peptide in the vial (mg) by the volume of BAC water you added (mL). For example: a 5 mg PT-141 vial reconstituted with 2 mL BAC water gives 5 ÷ 2 = 2.5 mg/mL.

  2. Step 2 — Calculate draw volume (mL)

    Divide your target dose (mg) by the concentration (mg/mL). For a 0.5 mg dose at 2.5 mg/mL: 0.5 ÷ 2.5 = 0.2 mL. This is the exact volume to draw into the syringe.

  3. Step 3 — Convert to U-100 syringe units

    Multiply the draw volume (mL) by 100. For 0.2 mL: 0.2 × 100 = 20 U-100 units. Read this number on the unit markings of a standard insulin syringe.

Dosage Formula

Concentration formula

Concentration (mg/mL) = Vial mg ÷ BAC water mL

Draw volume formula

Draw volume (mL) = Dose (mg) ÷ Concentration (mg/mL)

U-100 syringe units

U-100 units = Draw volume (mL) × 100

These three formulas apply to any PT-141 vial, regardless of size. U-100 is the standard insulin-syringe scale: 100 units = 1 mL.

PT-141 Calculator Tool

Enter your vial strength, BAC water volume, and target dose below. The calculator outputs concentration (mg/mL), draw volume (mL), and U-100 units. Educational and research use only.

Example PT-141 Calculations

Step-by-step worked examples using common vial sizes. Results are for illustrating the math only.

Standard 1 mg dose from 10 mg / 2 mL vial

  1. Vial: 10 mg  |  BAC water: 2 mL  |  Target dose: 1 mg
  2. Concentration: 10 ÷ 2 = 5 mg/mL
  3. Draw volume: 1 ÷ 5 = 0.2 mL
  4. U-100 units: 0.2 × 100 = 20 units

2 mg dose from 10 mg / 2 mL vial

  1. Vial: 10 mg  |  BAC water: 2 mL  |  Target dose: 2 mg
  2. Concentration: 10 ÷ 2 = 5 mg/mL
  3. Draw volume: 2 ÷ 5 = 0.4 mL
  4. U-100 units: 0.4 × 100 = 40 units

PT-141 Reconstitution Guide

PT-141 (bremelanotide) is typically supplied as a lyophilised powder in 10 mg vials. Reconstitute with bacteriostatic water (BAC water) for accurate, reproducible dosing.

  1. Swab both vial stoppers with a fresh alcohol swab and allow to air dry.
  2. Draw 2 mL of BAC water into a sterile syringe (yields 5 mg/mL).
  3. Insert the needle and inject BAC water slowly along the glass wall — not directly onto the powder.
  4. Gently swirl until dissolved. Solution should be clear. Do not shake.
  5. Store reconstituted PT-141 at 2–8 °C. Use within 4–6 weeks.

Frequently Asked Questions

What is the standard PT-141 reconstitution ratio?

A common setup is 10 mg vial + 2 mL BAC water = 5 mg/mL concentration. At this concentration, a 1 mg dose = 0.2 mL = 20 U-100 units.

How many doses does a 10 mg PT-141 vial provide?

At 1 mg per dose and 5 mg/mL concentration (10 mg + 2 mL BAC water), you get 10 doses per vial. At 2 mg per dose you get 5 doses.

What are U-100 syringe units?

U-100 is the standard scale for insulin syringes. 100 units = 1.0 mL. That means 10 units = 0.1 mL, 50 units = 0.5 mL. Multiply any draw volume in mL by 100 to get the U-100 units reading.

Do I need to recalculate if I change the amount of BAC water?

Yes. Changing BAC water volume changes the concentration (mg/mL), which changes the draw volume for the same mg dose. Always recalculate using: concentration = vial mg ÷ BAC water mL, then draw volume = dose mg ÷ concentration.

How do I convert mcg to mg for the calculator?

Divide mcg by 1000 to get mg. For example: 250 mcg = 0.25 mg, 500 mcg = 0.5 mg, 1000 mcg = 1 mg. Enter the mg value in the calculator.

What is PT-141 used for in research?

PT-141 (bremelanotide) is a melanocortin agonist studied for its role in sexual function pathways via MC3R and MC4R receptors. It is for research purposes only.

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For educational and research purposes only. Not medical advice. Consult a licensed healthcare professional before making any medical or health-related decisions.