Thymosin Alpha-1 5 mg vial
How much bacteriostatic water to add to a 5 mg vial of Thymosin Alpha-1, the syringe units for each common dose, and how many doses the vial holds.
- Water
- 1 mL
- Strength
- 5 mg/mL
- Common dose
- 1.6 mg
- Draw
- 32 units0.32 mL
- Doses per vial
- 3
The short answer
Mixed with 1 mL of bacteriostatic water, a 5 mg vial of Thymosin Alpha-1 holds 5 mg/mL. A 1.6 mg dose is then 32 units (0.32 mL) on a U-100 insulin syringe, and the vial holds about 3 doses of that size. Taken 2× per week, it lasts about 11 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 1.6 mg |
|---|---|---|---|
| 1 mL | 5 mg/mL | 50 mcg | 32 units (0.32 mL) |
| 2 mL | 2.5 mg/mL | 25 mcg | 64 units (0.64 mL) |
| 3 mL | 1.667 mg/mL | 16.7 mcg | 96 units (0.96 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 | |
| 1.6 mg | |||
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 1.6 mg under the skin twice weekly, 3–4 days apart. For hepatitis B the course is 6 months (52 doses). Some countries also approve it with interferon for hepatitis C.
Doses are what labels, trials or community reports reference, not recommendations. Thymosin Alpha-1’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 1 mLDraw 1 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, 5 mg/mL, on the vial.
Storage: Label: 2–8 °C. Mixed: 2–8 °C.
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 thymosin alpha-1?
There’s no single right amount: the water only sets the strength. With 1 mL of bacteriostatic water, a 5 mg vial holds 5 mg/mL. With 2 mL it’s 2.5 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 1.6 mg of thymosin alpha-1?
With 1 mL in a 5 mg vial, 1.6 mg is 32 units (0.32 mL) on a U-100 insulin syringe. With 2 mL, 64 units (0.64 mL); with 3 mL, 96 units (0.96 mL).
How many doses are in a 5 mg vial of thymosin alpha-1?
About 3 doses of 1.6 mg. Taken 2× per week at 1.6 mg, it lasts about 11 days.
How long does a mixed vial of thymosin alpha-1 keep?
Label: 2–8 °C. Mixed: 2–8 °C.
Other vial sizes
Sources
- Zadaxin (thymalfasin) drug information (RxList)
- FDA advisory committee briefing: thymosin alpha-1 (2024)
The math on this page uses the doses and storage on Thymosin Alpha-1’s page.