How many units of PT-141 should I draw?

It depends on your vial size, BAC water, and dose. For a 10mg vial with 2mL BAC water, a beginner dose of 500mcg is typically 10 units on a U-100 syringe. Use the calculator above for your exact numbers.

How much BAC water should I add to PT-141?

The standard amount is 2mL of bacteriostatic water for a 10mg vial. More water gives a more dilute solution — easier to measure small doses. Less water means fewer injections per vial. Adjust the BAC water slider in the calculator to see how it changes your syringe units.

How long does a PT-141 vial last?

At a beginner dose of 500mcg as needed, a 10mg vial lasts about 20 doses. The calculator shows exact doses per vial for your selected tier.

What syringe should I use for PT-141?

Most people use a U-100 insulin syringe (1mL / 100 units). For very small doses, a U-50 or U-30 syringe gives better precision. The calculator adjusts units automatically for whichever syringe you pick.

PT-141 Dosage Calculator

Sexual HealthInjectionFDA Approved~2.7 hours half-life

PT-141 (Bremelanotide) is the only FDA-approved peptide for hypoactive sexual desire disorder — marketed as Vyleesi.

FDA-approved (as Vyleesi) for sexual dysfunctionWorks at the brain level — increases desire, not just blood flowEffective for both men and womenOn-demand dosing (45-60 min before activity)

Vial Size

BAC Water (mL)

Dosing Level

500mcg · As needed

Custom Dose (mcg) — optional

Syringe Type

10.0 units

100 units (1mL)

Concentration

5,000

mcg/mL

Draw Volume

0.100

Syringe Units

10.0

units

Doses / Vial

doses

Summary: Add 2mL BAC water to your 10mg vial. Draw to 10.0 units on a U-100 syringe for a 500mcg dose. This vial will last 20 doses.

Cycle Planner

Cycle Length (weeks)

Price Per Vial ($) — optional

Subcutaneous. Typical beginner frequency: as needed.

PT-141 Pharmacokinetics

Pharmacokinetics — Active Dose Over Time

t½ = ~2.7 hours

After 1 half-life (3h): 50% remainsAfter 2 half-lives (5h): 25% remainsAfter 3 half-lives (8h): 12.5% remains

At a 1mg dose: 50% = 500mcg remaining after 3h. Recommended frequency: As needed.

Disclaimer: This curve is a simplified first-order exponential decay model. Actual pharmacokinetics vary based on injection site, individual metabolism, body composition, and other factors. Half-life values are approximate and based on available preclinical and clinical literature. Many research peptides lack formal human pharmacokinetic studies. This is for educational purposes only — not medical advice.

PT-141 Dosing Protocol

Level	Dose / Injection	Frequency
Beginner	500mcg	As needed
Moderate	1mg	As needed
Aggressive	1,750mcg	As needed

Note: MC4R agonist (Bremelanotide). Dose 45-60 min before activity. Max 8 doses/month. Nausea is common.

About PT-141

PT-141 (Bremelanotide) is the only FDA-approved peptide for hypoactive sexual desire disorder — marketed as Vyleesi. Unlike Viagra/Cialis, which work on blood flow, PT-141 works in the brain by activating melanocortin-4 receptors (MC4R) to increase sexual desire and arousal. It works for both men and women and addresses desire, not just mechanics.

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