Semax 5 mg vial
How much bacteriostatic water to add to a 5 mg vial of Semax, the syringe units for each common dose, and how many doses the vial holds.
- Water
- 2 mL
- Strength
- 2.5 mg/mL
- Common dose
- 300 mcg
- Draw
- 12 units0.12 mL
- Doses per vial
- 16
The short answer
Mixed with 2 mL of bacteriostatic water, a 5 mg vial of Semax holds 2.5 mg/mL. A 300 mcg dose is then 12 units (0.12 mL) on a U-100 insulin syringe, and the vial holds about 16 doses of that size. Taken 2× per day, it lasts about 8 days.
How much water
The water only sets the strength; the dose and the number of doses in the vial stay the same. Draws are on a U-100 insulin syringe, where 1 unit is 0.01 mL.
| Water added | Strength | Per syringe unit | Draw for 300 mcg |
|---|---|---|---|
| 1 mL | 5 mg/mL | 50 mcg | 6 units (0.06 mL) |
| 2 mL | 2.5 mg/mL | 25 mcg | 12 units (0.12 mL) |
| 3 mL | 1.667 mg/mL | 16.7 mcg | 18 units (0.18 mL) |
Dose chart
Syringe units for each common dose at each water volume. Select a cell to open it in the calculator.
| Dose | Water added | ||
|---|---|---|---|
| 1 mL | 2 mL | 3 mL | |
| 200 mcg | |||
| 250 mcg | |||
| 300 mcg | |||
| 400 mcg | |||
| 500 mcg | |||
| 600 mcg | |||
Draws over 100 units show in mL. Faded values are under 2 units, which is hard to measure. Check that your vial holds the larger volumes.
Where the doses come from
- Label 0.1% drops: usually 2–3 drops per nostril (200–300 mcg), 2–4× daily.
- Label 1% drops, for acute stroke under hospital care: 2,000–4,000 mcg per dose.
- Community About 600–1,500 mcg a day intranasal. No injection standard.
Doses are what labels, trials or community reports reference, not recommendations. Semax’s page has the cycle, side effects, cautions and sources.
Mixing and storage
- PrepareLet a refrigerated vial come to room temperature, and wipe both stoppers with an alcohol swab.
- Add 2 mLDraw 2 mL of bacteriostatic water and let it run slowly down the inside wall of the vial.
- Swirl, don’t shakeSwirl gently until the powder dissolves and the liquid is clear.
- Label itWrite the date and the strength, 2.5 mg/mL, on the vial.
Storage: Powder: −20 °C. Mixed: 2–8 °C, about 4 weeks.
The reconstitution guide covers each step, and the units page explains syringe markings.
Questions
How much water do I add to a 5 mg vial of Semax?
There’s no single right amount: the water only sets the strength. With 2 mL of bacteriostatic water, a 5 mg vial holds 2.5 mg/mL. With 1 mL it’s 5 mg/mL; with 3 mL it’s 1.667 mg/mL. Less liquid makes each dose a smaller draw; more makes small doses easier to measure.
How many units is 300 mcg of Semax?
With 2 mL in a 5 mg vial, 300 mcg is 12 units (0.12 mL) on a U-100 insulin syringe. With 1 mL, 6 units (0.06 mL); with 3 mL, 18 units (0.18 mL).
How many doses are in a 5 mg vial of Semax?
About 16 doses of 300 mcg, or 10 of 500 mcg or 8 of 600 mcg. Taken 2× per day at 300 mcg, it lasts about 8 days.
How long does a mixed vial of Semax keep?
Powder: −20 °C. Mixed: 2–8 °C, about 4 weeks.
Other vial sizes
Sources
- Semax 0.1% instructions (Peptogen, in Russian)
- Semax 1% entry (Vidal.ru, Russian)
- FDA advisory committee backs 6 peptides for compounding (AJMC, July 2026)
The math on this page uses the doses and storage on Semax’s page.