PT-141 (Bremelanotide) protocol

Standard

FDA dose women

17.5u

1.75 mg · As-needed

FDA-approved Vyleesi dose.

Community men

10–20u

1–2 mg · As-needed

Off-label research.

Max

1×/day, 8×/month

FDA Vyleesi label: max 1 dose per 24 hours AND max 8 doses per month. Exceeding 8/month carries significantly higher focal-hyperpigmentation risk (see Side effects).

Phase	How often	Dose	Units	Notes
FDA dose women	As-needed	1.75 mg	17.5u	FDA-approved Vyleesi dose.
Community men	As-needed	1–2 mg	10–20u	Off-label research.
Max	1×/day, 8×/month	–	–	FDA Vyleesi label: max 1 dose per 24 hours AND max 8 doses per month. Exceeding 8/month carries significantly higher focal-hyperpigmentation risk (see Side effects).

Cycle & timing

Cycle: As-needed (situational) per FDA Vyleesi label. Max 1 dose per 24 hours; max 8 doses per month. Not for daily or scheduled use.

Timing: Single shot 30–90 min before sexual activity (situational).

Where: Abdomen SubQ.

What to expect

Sexual desire and arousal within 30–60 min. Duration 6–24 hours. Nausea and flushing common, less if dosed in the evening. Use caution if combining with PDE5 inhibitors (sildenafil, tadalafil); additive transient BP and HR effects; not an FDA-labeled contraindication.

Men & women

Men: Began as a men’s erectile-dysfunction drug (acts in the brain, adds to sildenafil).

Women: FDA-approved (Vyleesi) for premenopausal women with low sexual desire (HSDD). Nausea common.

Dilution calculator

Set to the guide's typical mix for PT-141 (Bremelanotide). Change anything to see where to draw.

Vial size

BAC water added

Dose you want

Draw to

17.5u

Volume

0.17 mL

Strength

10 mg/mL

Doses per vial

5

Assumes a U-100 insulin syringe (100 units = 1 mL). Double-check against the compound's page before you draw.

Recommended mixes

Vial	Water	Strength
10 mg	1 mL	10 mg/mL

10 mg: 1 unit = 0.10 mg

Storage

PowderFreeze-dried: -4°F.
MixedReconstituted: 36–46°F, use within 30 days.

Don't use if: Personal or family history of melanoma · Atypical mole syndrome / dysplastic nevus syndrome · Active skin cancer or pre-malignant skin lesions · Uncontrolled hypertension; significant cardiovascular disease · Pregnancy and lactation

Stop if you notice

New atypical mole or rapid change (ABCDE)
Sustained BP >140/90 in a previously normotensive patient
Priapism (>4 h erection), emergency care
Severe nausea not resolving with dose reduction
Persistent hyperpigmentation

Side effects

Nausea, flushing, BP elevation (transient). Less nausea PM vs AM. Focal hyperpigmentation (face/gums/breasts): ~1% with intermittent as-needed use, but 38% when dosed daily for 8 consecutive days (FDA Vyleesi label); argues strongly against scheduled daily dosing.

Drug interactions

PDE5 inhibitors (sildenafil, tadalafil, vardenafil): additive BP; separate timing per label. Antihypertensives / vasoactive drugs: additive or paradoxical BP effects. Naltrexone: decreases naltrexone exposure significantly. Narrow-TI oral meds: delayed absorption.

Labs

Blood pressure before each dose (stop if SBP drop >20 mmHg from baseline). Dermatology baseline mole mapping (photographic), repeat every 12 weeks during active use and every 6–12 months after.

What these labs mean →

Warnings

Hyperpigmentation of all melanocytes including existing moles (mole monitoring required); new mole formation. Transient BP elevation (~6 mmHg systolic per Vyleesi label). Nausea (most pronounced AM, less PM). Reduced response / tachyphylaxis with frequent use.

Patient education

Photograph moles at baseline; recheck monthly (ABCDE: Asymmetry, Border, Color, Diameter >6mm, Evolution). Use sunscreen, extra melanin doesn’t replace UV protection. Do not exceed 1 dose/24 h or 8 doses/month (Vyleesi label). Erection >4 h is a medical emergency. Tell any prescriber before combining with an ED pill.

These apply on top of the universal safety rules.

Pairs well with

Melanotan II (MT-2)

libido + tan

Melanotan II (MT-2)

Kisspeptin-10

HPG axis support

Kisspeptin-10

Avoid with

Uncontrolled hypertension

transient BP rise on injection

PDE5 inhibitors at peak

additive transient BP elevation

Cardiovascular disease

Can PT-141 (Bremelanotide) + Melanotan II (MT-2) share a syringe?

Depends on timing. Reproductive and hormonal peptides are compatible, but doses and timing vary widely. Combine only what you truly co-time. If unsure, separate.

What it does

FDA-approved melanocortin agonist for HSDD, activates MC4R in the brain to increase sexual desire and arousal centrally. Activates MC4R in hypothalamic arousal circuits. Unlike PDE5 inhibitors (blood flow), PT-141 works on the brain; see the comparison on the next page.

PT-141 vs Viagra & Cialis

The difference: They fix different problems, which is why one can work when the other doesn’t. Viagra and Cialis are plumbing, they open blood flow so an erection can happen, but only if you’re already turned on. PT-141 is the brain, it creates the wanting. Quick test: “want to but can’t” → Viagra/Cialis. “Can but don’t want to” → PT-141.

	PT-141	Viagra (sildenafil)	Cialis (tadalafil)
What it does	Brain, switches on desire/arousal	Blood flow, keeps an erection holding	Blood flow, keeps an erection holding
Works without arousal?	Yes, it creates the arousal	No, you must already be aroused	No, you must already be aroused
Best for	Low desire; or pills work but you feel nothing	Erection trouble, on demand	Erection trouble; also BPH
How to take	SubQ, 45 min–2 h before; max 1/24 h, 8/month	Pill ~1 h before; 25/50/100 mg	Pill 10/20 mg PRN, or 2.5–5 mg daily
Lasts	~6–24 h	~4–6 h	Up to 36 h
FDA-approved	Women (HSDD), as Vyleesi; men off-label	Yes; erectile dysfunction in men	Yes; erectile dysfunction in men
Hard no	Melanoma / atypical moles; uncontrolled BP; heart disease	Never with nitrates (nitroglycerin, “poppers”); dangerous BP crash	Never with nitrates (nitroglycerin, “poppers”); dangerous BP crash. Cialis: none within 48 h

Together? Different systems, so combining is plausible and under study; but both affect blood pressure, so stacking at peak can cause dizziness. Clinician conversation, not a DIY stack.

Honest read: the pills are the proven, approved, cheap option for men; PT-141 is the one that treats desire, which they can’t; but for men it’s off-label, injected, and nausea is common.

References

researchdosing peptidedosages DailyMed Kingsberg 2019 Wessells 2000

From the guide, page 77–78.