Enter your PT-141 (Bremelanotide) vial size and the volume of bacteriostatic water you are adding. The calculator returns the concentration in mcg/ml and the exact units to draw on a U-100 insulin syringe. It works for the common 10mg vial.
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Results
Concentration
5000 mcg/ml
5 mg/ml
Volume to inject
0.2 ml
per dose
Units on insulin syringe (U-100)
20 units
on a standard 100-unit insulin syringe
Doses per vial
10 doses
at 1000 mcg each
How this is calculated
10mg × 1,000 = 10000 mcg total
10000 ÷ 2ml = 5000 mcg/ml
1000 mcg ÷ 5000 = 0.2 ml
0.2 ml × 100 = 20 units
Disclaimer: This calculator is provided for informational purposes only. Always verify results against your specific vial labelling before use. Peptidy does not provide medical advice — consult a qualified healthcare professional before beginning or modifying any protocol. Use of research peptides may be subject to legal restrictions in your jurisdiction.
PT-141 is a melanocortin-receptor agonist researched for libido, usually taken as a single subcutaneous dose ahead of activity rather than on a daily schedule. Doses vary widely between individuals, so start low and calculate your units precisely.
Ranges commonly reported in research use, taken ahead of anticipated activity. Response and side effects (such as nausea and flushing) vary, so many people start at the low end.
| Lower dose | 0.5–1 mg (500–1,000 mcg) as a single dose |
| Higher dose | up to 2 mg (2,000 mcg) as a single dose |
Worked example: 10mg vial + 2ml BAC water, 1mg dose
2ml gives 5,000 mcg/ml, so a 1mg dose is 0.2ml = 20 units and a 0.5mg starting dose is 10 units. This makes the common 0.5–2mg range easy to measure on a U-100 syringe.
With a 10mg vial reconstituted in 2ml (5,000 mcg/ml): 1,000 ÷ 5,000 = 0.2ml = 20 units. A 0.5mg dose is 10 units and 2mg is 40 units at the same concentration.
PT-141 is typically administered as a single subcutaneous dose some hours ahead of anticipated activity rather than daily. Because response varies, many people trial a low dose first to assess tolerance.
Refrigerate at 2–8°C away from light and label the vial with the date. Reconstituted PT-141 is commonly used within 4–6 weeks. Do not freeze it.
Store your vial concentration, log every dose against it, and never lose track of what you injected or when.