PT-141 & Melanotan II (10 mg Vials) Dosage Protocol

Quickstart Highlights

PT-141 (bremelanotide) and Melanotan II are cyclic melanocortin receptor agonists with distinct but related applications. PT-141 is FDA-approved for hypoactive sexual desire disorder and is used on-demand^[1]^[2], while Melanotan II has been studied for its effects on skin pigmentation and sexual function with daily dosing protocols^[5]^[6]. This educational guide covers reconstitution, dosing, and administration for both peptides.

Reconstitute each: Add 3.0 mL bacteriostatic water → ~3.33 mg/mL concentration.

PT-141 dose: 750–1750 mcg on-demand (≥45 min before activity); max 1 dose per 24 h.

Melanotan II dose: 250–1000 mcg once daily with gradual titration.

Easy measuring: At 3.33 mg/mL, 1 unit = 0.01 mL ≈ 33.3 mcg on a U-100 insulin syringe.

Storage: Lyophilized: freeze at −20 °C (−4 °F); reconstituted: refrigerate at 2–8 °C (35.6–46.4 °F) and use within ~1 week.

Dosing & Reconstitution Guide

Educational guide for reconstitution and dosing of both peptides

PT-141 (Bremelanotide) — On-Demand Protocol (3 mL = ~3.33 mg/mL)

Route: Subcutaneous injection (abdomen or thigh). Frequency: On-demand, at least 45 minutes before anticipated sexual activity; no more than 1 dose per 24 hours and ≤8 doses per month^[1]^[3].

Phase	Dose (mcg)	Units (per injection) (mL)
Initial / Titration	500–750 mcg	15–22 units (0.15–0.22 mL)
Standard	1000–1500 mcg	30–45 units (0.30–0.45 mL)
Full / FDA-Approved	1750 mcg (1.75 mg)	52 units (0.52 mL)

Titration: Start at a lower dose (500–750 mcg) and increase as tolerated. Nausea is common with initial use and typically diminishes with subsequent doses^[2]^[4].

Melanotan II — Daily Protocol (3 mL = ~3.33 mg/mL)

Route: Subcutaneous injection (abdomen or thigh). Frequency: Once daily during loading phase; reduced frequency for maintenance^[5]^[6].

Week	Daily Dose (mcg)	Units (per injection) (mL)
Week 1	250 mcg	7.5 units (0.075 mL)*
Week 2	500 mcg	15 units (0.15 mL)
Weeks 3–4	750 mcg	22 units (0.22 mL)
Weeks 5+ (Loading)	1000 mcg	30 units (0.30 mL)
Maintenance	500–1000 mcg (2–3×/week)	15–30 units (0.15–0.30 mL)

*For ≤10-unit (≤0.10 mL) administrations, consider 30- or 50-unit insulin syringes for improved readability.

Titration: Begin at 250 mcg and increase by 250 mcg every 5–7 days as tolerated. Nausea and flushing are common initially and typically subside with continued use^[6].

Reconstitution Steps (Both Peptides)

Draw 3.0 mL bacteriostatic water with a sterile syringe.

Inject slowly down the vial wall; avoid foaming or direct impact on the powder.

Gently swirl or roll until fully dissolved (do not shake).

Label with date, peptide name, and concentration; refrigerate at 2–8 °C (35.6–46.4 °F), protected from light.

Use reconstituted solution within approximately 1 week for optimal stability^[7].

Important: This guide is for educational purposes only and is not medical advice. For research use only. Not for human consumption.

Supplies Needed

Plan based on an 8–16 week protocol. PT-141 assumes ~1 dose/week on-demand; Melanotan II assumes daily loading then maintenance.

PT-141 (On-Demand, ~1×/week)

Peptide Vials (PT-141, 10 mg each):

8 weeks: 2 vials
12 weeks: 3 vials
16 weeks: 4 vials

Insulin Syringes (U-100):

8 weeks: 8 syringes
12 weeks: 12 syringes
16 weeks: 16 syringes

Bacteriostatic Water (10 mL bottles):

8 weeks (2 vials × 3 mL): 1 bottle
12 weeks (3 vials × 3 mL): 1 bottle
16 weeks (4 vials × 3 mL): 2 bottles

Melanotan II (Daily Loading → Maintenance)

Peptide Vials (Melanotan II, 10 mg each):

8 weeks: 6 vials
12 weeks: 9 vials
16 weeks: 12 vials

Insulin Syringes (U-100):

8 weeks: 56 syringes (7/day × 8 weeks)
12 weeks: 84 syringes
16 weeks: 112 syringes

Bacteriostatic Water (10 mL bottles):

8 weeks (6 vials × 3 mL = 18 mL): 2 bottles
12 weeks (9 vials × 3 mL = 27 mL): 3 bottles
16 weeks (12 vials × 3 mL = 36 mL): 4 bottles

Shared Supplies

Alcohol Swabs: One for the vial stopper + one for the injection site each administration.

8 weeks: 128 swabs → recommend 2 × 100-count boxes
12 weeks: 192 swabs → recommend 2 × 100-count boxes
16 weeks: 256 swabs → recommend 3 × 100-count boxes

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Protocol Overview

Summary of both peptide regimens.

PT-141: On-demand subcutaneous use for sexual function; typical dose 1.75 mg (1750 mcg) administered ≥45 min before activity^[1].

Melanotan II: Daily subcutaneous injections during loading phase (4–8 weeks), then 2–3× weekly maintenance for pigmentation and related effects^[5].

Reconstitution: 3.0 mL per 10 mg vial (~3.33 mg/mL) for both peptides.

Storage: Lyophilized frozen at −20 °C (−4 °F); reconstituted refrigerated at 2–8 °C (35.6–46.4 °F).

Research Disclaimer

Melanotan II (10 mg Vial) & PT-141 (10 mg Vial) Dosage Protocol