PT-141 10 mg reconstitution calculator
How much bac water for PT-141 10 mg?
There’s no single right amount: the water sets the strength, not how much PT-141 is in the vial, so use the volume on your pharmacy’s instructions. For example, 1 mL makes 10 mg/mL and 2 mL makes 5 mg/mL; the table below shows what each volume means on a U-100 syringe.
Your PT-141 vial
Syringe
1 mL · 2-unit marks
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Find the water for a given reading in units.
Enter your numbers to see the result.
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This is arithmetic, not medical advice. Confirm with your prescriber or pharmacist.
How our calculator worksAdvanced
Vial capacityOptional
The volume printed on the vial or its box, not the mg. We’ll tell you if the water won’t fit.
What each volume makes
| Water | Strength | Each unit | 1 mg is |
|---|---|---|---|
| 1 mL | 10 mg/mL | 100 mcg | 10 units |
| 2 mL | 5 mg/mL | 50 mcg | 20 units |
| 2.5 mL | 4 mg/mL | 40 mcg | 25 units |
Examples; use the volume on your pharmacy’s instructions. Units are on a U-100 syringe: 100 units = 1 mL.
About the 10 mg vial
The approved product is never mixed
Bremelanotide’s only FDA-approved form is Vyleesi: 1.75 mg in 0.3 mL of ready-made solution in a single-dose autoinjector, sold in cartons of 2 or 4 (Vyleesi label). There’s no vial and no water to add, and it’s the only bremelanotide product listed on DailyMed. A 10 mg powder vial sold as PT-141 is not Vyleesi, and the strength doesn’t carry over either: Vyleesi works out to about 5.83 mg/mL, while a mixed 10 mg vial is 10 mg/mL with 1 mL of water, 5 mg/mL with 2 mL and 4 mg/mL with 2.5 mL.
Bremelanotide or its acetate salt?
The Vyleesi label counts the drug two ways: each autoinjector holds 1.75 mg of bremelanotide, “equivalent to 1.89 mg bremelanotide acetate” (Vyleesi label). The salt weighs about 8% more than the peptide it carries. A powder vial labeled 10 mg may not say which one it means. If the 10 mg were the acetate salt, the same ratio puts the bremelanotide at about 9.26 mg. The calculator uses the number on your label, so ask a pharmacist which form that number refers to.
What the Vyleesi label says about blood pressure
Even the approved product raises blood pressure. On the Vyleesi label, it raised systolic pressure by up to 6 mmHg and diastolic by up to 3 mmHg, peaking 2 to 4 hours after the dose, while heart rate fell by up to 5 beats per minute; both usually returned to baseline within 12 hours (Vyleesi label). The label says not to use it with uncontrolled hypertension or known cardiovascular disease, not to give more than one dose within 24 hours, and that more than 8 doses a month is not recommended. These are label facts for Vyleesi, not figures for a powder vial; follow your prescriber.
A research-use label didn't satisfy the FDA
On August 24, 2026, the FDA sent warning letters to three websites selling PT-141, calling the products “unapproved new drugs under section 505(a)” (FDA, FDA, FDA). One letter said that despite labels reading “research use only” and “not for human or veterinary use,” the website showed the products were intended as drugs for human use. It also named bacteriostatic water sold to reconstitute them. A research label on a 10 mg vial doesn’t make it an approved or checked product.
Sources for these notes
- VYLEESI (bremelanotide) injection, prescribing informationDailyMed, U.S. National Library of Medicine, 2025 (opens in a new tab)
- VYLEESI (bremelanotide) injection, prescribing informationDailyMed, U.S. National Library of Medicine, 2025 (opens in a new tab)
- VYLEESI (bremelanotide) injection, prescribing informationDailyMed, U.S. National Library of Medicine, 2025 (opens in a new tab)
- Warning letter: TXP Innovations LLC dba Tex Peptides (MARCS-CMS 735067)U.S. Food and Drug Administration, 2026 (opens in a new tab)
- Warning letter: Peak Performance Peptides (MARCS-CMS 735127)U.S. Food and Drug Administration, 2026 (opens in a new tab)
- Warning letter: NuScience Peptides LLC (MARCS-CMS 733652)U.S. Food and Drug Administration, 2026 (opens in a new tab)
About PT-141
US regulatory status
FDA-approved for a different use
Bremelanotide is FDA-approved only as Vyleesi, a 1.75 mg single-dose autoinjector for acquired, generalized hypoactive sexual desire disorder (HSDD) in premenopausal women. The label says it is not indicated for men, for postmenopausal women or to enhance sexual performance. Nasal sprays and powder vials sold as “PT-141” are unapproved drugs, and in August 2026 the FDA sent warning letters to three websites selling them.
As of
Sources (4)
- VYLEESI (bremelanotide) injection, prescribing informationDailyMed, U.S. National Library of Medicine, 2025 (opens in a new tab)
- Warning letter: TXP Innovations LLC dba Tex Peptides (MARCS-CMS 735067)U.S. Food and Drug Administration, 2026 (opens in a new tab)
- Warning letter: Peak Performance Peptides (MARCS-CMS 735127)U.S. Food and Drug Administration, 2026 (opens in a new tab)
- Warning letter: NuScience Peptides LLC (MARCS-CMS 733652)U.S. Food and Drug Administration, 2026 (opens in a new tab)
How this PT-141 calculator works
This PT-141 reconstitution calculator starts from the 10 mg in your vial. Add the water you mix it with and the dose your prescriber gave you; it divides the mg by the mL to get the strength, then turns your dose into mL and units on a 30, 50 or 100-unit syringe.
Peptinote never suggests a dose or a water volume. The example volumes are there to make the math easy to check, not as advice. For the full method, see the peptide calculator.
Questions people ask
How do I reconstitute PT-141 10 mg?
Wipe both stoppers with alcohol and let them dry. Draw the volume of bacteriostatic water your pharmacy specifies into a new syringe, add it slowly down the inside of the vial, then swirl gently until clear; don’t shake. Label it with the strength: 10 mg in 1 mL is 10 mg/mL. Full steps: how to reconstitute peptides.
How much bac water PT 141?
There’s no single right amount: use the volume on your pharmacy’s instructions. The water only sets the strength; the vial still holds 10 mg however much you add. With 1 mL it’s 10 mg/mL (100 mcg per unit), with 2 mL 5 mg/mL (50 mcg per unit) and with 2.5 mL 4 mg/mL (40 mcg per unit). Enter your volume and prescribed dose above to get the units.
Is there a peptide calculator for PT-141?
This page is the PT-141 10 mg reconstitution calculator. Enter the water you add (or tap an example volume) and your prescribed dose, and it shows the units to draw on a 30, 50 or 100-unit syringe, the strength, and the doses in the vial, with every step of the math. It never suggests a dose.
How do I reconstitute PT-141?
Mixing your PT-141 10 mg vial takes the bacteriostatic water your pharmacy specifies and a new sterile syringe. Add the water slowly against the glass and swirl, never shake, until the liquid is clear. If it stays cloudy or has particles, don’t use it; call your pharmacy. Then write the strength and date on the vial and store it as the label says (how to store peptides).
How do PT-141 units convert to mg?
Units measure volume (1 unit = 0.01 mL), so converting them to mg needs the strength: mg = units ÷ 100 × mg/mL. In a 10 mg vial, with 1 mL each unit holds 100 mcg, with 2 mL each unit holds 50 mcg and with 2.5 mL each unit holds 40 mcg. Multiply by the units you draw, or let the calculator above do it, with every step shown.
Can Peptinote tell me how many units to take?
No. Peptinote never suggests a dose. Enter the dose your prescriber gave you, and the calculator shows how to measure it: the units, the mL and where the line sits on your syringe, with every step of the math. If you aren’t sure what your dose is, ask your prescriber or pharmacist before drawing anything. How our calculator works.
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Every result is plain arithmetic from formulas we publish in full and check with automated tests. Peptinote doesn’t suggest doses and never sells or links to sellers of peptides.