PT-141 (10mg Vial)

PT-141 (bremelanotide) is an agonist of melanocortin receptors (MC3R/MC4R), with central activity in the hypothalamus—an area linked to sexual desire and appetite regulation.

It activates sexual arousal circuits in the central nervous system, differing from approaches focused only on vasodilation/perfusion.

Key Benefits

Erectile dysfunction (ED): effective in men who do not respond well to PDE5 inhibitors (e.g., Viagra/Cialis).

Improves sexual desire in both men and women.

Provides a significant increase in libido and physical response within a short period after administration.

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PT-141 (bremelanotide) is an agonist of melanocortin receptors (MC3R/MC4R), with central activity in the hypothalamus—an area linked to sexual desire and appetite regulation.

It activates sexual arousal circuits in the central nervous system, differing from approaches focused only on vasodilation/perfusion.

Key Benefits

Erectile dysfunction (ED): effective in men who do not respond well to PDE5 inhibitors (e.g., Viagra/Cialis).

Improves sexual desire in both men and women.

Provides a significant increase in libido and physical response within a short period after administration.

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RECONSTITUTION, DOSING AND STORAGE OF PEPTIDES IN A VIAL
(General guidance – not peptide-specific)

1. INTRODUCTION
Peptides supplied in a vial (a glass vial containing lyophilised powder) are not ready for immediate use.
Before administration, it is mandatory to carry out reconstitution, which is the process of converting the lyophilised powder into a sterile liquid solution.
Correct reconstitution is essential to ensure:
Safe use
Peptide stability
Accurate dosing
Protocol effectiveness
⚠️ Incorrect preparation may result in inaccurate dosing and reduced effectiveness.

2. REQUIRED MATERIALS
Vial containing the lyophilised peptide
Bacteriostatic Water
    Contains approximately 0.9% benzyl alcohol
    Helps inhibit bacterial growth
Insulin syringe (100 units = 1 mL)
Sterile needle
Clean, hygienic environment

3. WHAT RECONSTITUTION IS
Reconstitution is the controlled addition of bacteriostatic water to the lyophilised powder, creating a liquid solution suitable for subcutaneous use.

4. GENERAL RULE FOR CALCULATING CONCENTRATION
Basic formula:
Amount of peptide (mg) ÷ Volume of water (mL) = Concentration (mg/mL)
This concentration is used to calculate the correct dose in the syringe.

5. CORRECT RECONSTITUTION TECHNIQUE
⚠️ IMPORTANT: PEPTIDES ARE FRAGILE MOLECULES
Recommended procedure:

  1. Draw the desired volume of bacteriostatic water into the syringe.
  2. Insert the needle into the vial.
  3. Allow the water to run slowly down the inner wall of the vial.
  4. Do not direct the stream straight onto the powder.
  5. Do not shake the vial.

Gently roll the vial between your fingers until fully dissolved.
**Vigorous shaking may cause peptide degradation.

6. CONVERSION FOR AN INSULIN SYRINGE
 1 mL = 100 units
The amount of peptide per unit depends on the final concentration after reconstitution.
Always calculate dosing based on the concentration (mg/mL).

7. STORAGE AFTER RECONSTITUTION
Keep refrigerated between 2°C and 8°C
Do not freeze
Keep the vial tightly sealed
Protect from light, especially for photosensitive peptides

8. FINAL CONSIDERATIONS

  • Always follow the correct preparation technique
  • Use bacteriostatic water only
  • Maintain strict accuracy in dose calculations
  • Use should be carried out under professional supervision

 

FDA approval (2019): based on Phase III studies showing a significant improvement in desire and reduced sex-related distress in women. Safarinejad study (2008): a randomised clinical trial assessing PT-141 in men who did not respond to sildenafil (Viagra), reporting positive outcomes.
 PT-141 Reconstitution
Example preparation
Vial content: 10 mg
Dilution volume: 2 ml bacteriostatic water
Concentration calculation
10 mg ÷ 2 ml = 5 mg/ml
Correct Dilution Technique
PT-141 is a sensitive molecule.
Procedure:
1.Draw 2 ml of bacteriostatic water.
2.Inject slowly into the vial, allowing the liquid to run down the inner wall.
3.Do not shake.
4.Gently swirl the vial until fully dissolved.
Vigorous agitation may degrade the peptide.

Dose Conversion – Insulin Syringe

Final concentration: 5 mg/ml
Syringe units PT-141 dose
10 units 0.5 mg
20 units 1.0 mg
30 units 1.5 mg
35 units 1.75 mg
40 units 2.0 mg
Recommended Dosage
* Dose range commonly cited in clinical protocols: 1.0 – 2.0 mg per administration.
Storage
After reconstitution:
•Store refrigerated at 2 °C to 8 °C
•Do not freeze
•Protect from light
•Avoid temperature fluctuations
Photosensitivity
PT-141 is light-sensitive. It is recommended to:
•Wrap the vial in aluminium foil, or
•Store in an opaque container inside the refrigerator
Typical stability: 20–30 days under proper refrigeration.
Precautions and Possible Effects
Nausea
•May occur 30 to 60 minutes after administration
•Common strategies:
•Light meal prior to use
•Use of an antiemetic (e.g., ondansetron) when advised by a healthcare professional
It is recommended to limit frequency of use and avoid excessive administration (e.g., do not exceed multiple weekly applications without professional guidance).

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