Semax 10 mg Vial: Reconstitution and Dosing Chart

How much bacteriostatic water to add to a 10 mg vial of Semax, the concentration you get, and a full dose-to-units chart.

Medical review pendingACTH(4-10) analogUpdated 20 Oct 2026

Vial size: 10 mg
With 2 mL water: 5 mg/mL; common choice
10 units contain: 500 mcg; at 2 mL, U-100
Whole vial: 200 units; 2 mL on a U-100 scale

How much water to add

Bacteriostatic water only changes the concentration, not the amount of Semax in the vial. More water means more units per dose (easier to read), less water means fewer.

Semax 10 mg vial: concentration by water added
Water added	Concentration	10 units contain	100 mcg is	Whole vial
1 mL	10 mg/mL	1000 mcg	1 u	100 u
2 mL	5 mg/mL	500 mcg	2 u	200 u
2.5 mL	4 mg/mL	400 mcg	2.5 u	250 u
3 mL	3.333 mg/mL	333.3 mcg	3 u	300 u

Calculator and full dosing table

Preset to the 10 mg vial. Change any value; the table below the result updates with it.

1Vial size

2Bacteriostatic water added

3Dose per injection

4Syringe (U-100)

Draw to

10units

= 0.1 mL on a 1 mL U-100 insulin syringe

10 mg vial2 mL water500 mcg dose

Concentration: 5 mg/mL
Doses per vial: 20
Weeks (1 dose/wk): 20

Math only. It does not recommend a dose.

Dosing table for a 10 mg vial

Syringe units (U-100) for each dose, by how much bacteriostatic water you add.

Semax: U-100 syringe units per dose for a 10 mg vial
Dose	1 mL water	2 mL water	2.5 mL water	3 mL water
100 mcg	1	2	2.5	3
250 mcg	2.5	5	6.25	7.5
300 mcg	3	6	7.5	9
500 mcg	5	10	12.5	15
750 mcg	7.5	15	18.75	22.5
1000 mcg	10	20	25	30

How the math works

Concentration is the vial's milligrams divided by the water you add. Volume to draw is your dose divided by that concentration. On a U-100 syringe, 1 mL is 100 units, so units = mL × 100.

10 mg ÷ 2 mL = 5 mg/mL
500 mcg = 0.5 mg; 0.5 mg ÷ 5 mg/mL = 0.1 mL
0.1 mL × 100 = 10 units

10 units · 0.1 mL · 500 mcg from 10 mg + 2 mL

Math only. The amounts in these tables are reference values for the arithmetic, not dose recommendations.

Where the semax amounts for a 10 mg vial come from

The stroke trial gave each course for 10 days at 6000 mcg/day, route not stated in the abstract.^[3]

Peptic ulcer patients received intranasal semax as a 1% solution, 2-4 drops 3 times a day for 10 days; drop volume is not stated, so no mg amount is derived.^[4]

Rat pups received intranasal semax at 50 µg/kg daily, a per-kg animal dose that is not converted.^[5]

What a 10 mg semax vial gives

Mixed with 1, 2 or 3 mL of water, a 10 mg semax vial is 10, 5 or 3.333 mg/mL, so one U-100 unit holds 100, 50 or 33.333 mcg.

Calculated from vial mg 10; water mL 1, 2, 3; u100 units per mL 100. Formula: mg/mL = vialMg / waterMl; mcg per unit = mg/mL x 10

A 10 mg semax vial holds 10000 mcg in total, which is 100 mcg per unit if mixed to 1 mL and 33.333 mcg per unit if mixed to 3 mL.

Calculated from vial mg 10. Formula: mcg = vialMg x 1000; per unit = mcg / (100 x mL)

A 1% solution is 1 g per 100 mL, which is 10 mg/mL; a 10 mg semax vial mixed with 1 mL is the same 10 mg/mL strength, though the ulcer trial does not say how its solution was made.

Calculated from percent solution 1; mg per mL per percent 10; vial mg 10; water mL 1. Formula: mg/mL = percent x 10 = 10; vial: 10 mg / 1 mL = 10 mg/mL

Is 10 mg a labelled semax strength?

The Drugs@FDA lookup for semax queried the active ingredient "semax" and found no application.^[6]

With 0 matching applications in Drugs@FDA there is no labelled strength to compare a 10 mg semax vial with.

Calculated from vial mg 10; drugs fda matches 0; source s2-legal/api.fda.gov/drugsfda-semax.txt. Formula: labelled strengths available = 0

Common questions

How much water goes in a 10 mg vial of Semax?

That choice only changes the concentration. With 2 mL, a 10 mg vial is 5 mg/mL; with 1 mL it is 10 mg/mL. Less water means fewer units per dose and harder-to-read marks for small doses.

How many units is 100 mcg from a 10 mg vial?

With 2 mL of water, 100 mcg is 2 units on a U-100 syringe. With other water amounts, see the table.

How many doses are in a 10 mg vial?

Divide the vial size by the dose (in the same unit). The calculator on this page shows the number of whole doses for any dose you pick.

How much bacteriostatic water for a 10mg semax vial?

The water volume only sets the strength: 10 mg of semax in 1, 2 or 3 mL is 10, 5 or 3.333 mg/mL, which is 100, 50 or 33.333 mcg per syringe unit.

Calculated from vial mg 10; water mL 1, 2, 3. Formula: mg/mL = vialMg / waterMl; mcg per unit = mg/mL x 10

More on Semax

DosageDoses used in published studies, with the source for each.CalculatorVial, water and dose to syringe units.Side effectsWhat labels and studies report, and what is unknown.BenefitsClaimed benefits next to what published studies measured.How it worksTarget, mechanism and how long it acts, from the label or studies.Nasal sprayStudies that gave Semax as nasal spray, and what is approved.

Sources

1Metric (SI) Prefixes (NIST Reference on Constants, Units, and Uncertainty)National Institute of Standards and Technology (NIST) · 2025physics.nist.govAccessed 2 Oct 2026
2BASAGLAR (insulin glargine) injection, prescribing information (DailyMed)U.S. Food and Drug Administration / DailyMed (Eli Lilly and Company label) · 2026dailymed.nlm.nih.govAccessed 2 Oct 2026
3[The efficacy of semax in the tretament of patients at different stages of ischemic stroke].Zhurnal nevrologii i psikhiatrii imeni S.S. Korsakova · 2018PMID 29798983Accessed 2 Oct 2026
4Therapy of peptic ulcer with semax peptide.Bulletin of experimental biology and medicine · 2002PMID 12459874Accessed 2 Oct 2026
5Correction of long-lasting negative effects of neonatal isolation in white rats using semax.Acta naturae · 2012PMID 22708068Accessed 2 Oct 2026
6Drugs@FDA (openFDA) search: active ingredient "semax"U.S. Food and Drug Administration · 2026api.fda.govAccessed 2 Oct 2026

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