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Vial size, bacteriostatic water and dose in — the syringe reading comes out. Defaults are the Tirzepatide numbers from the Dosify Me app; change anything.
Quick answer: A 5 mg vial of Tirzepatide mixed with 0.5 mL of bacteriostatic water comes to 10 mg/mL, so a 2.5 mg dose is 25 units (0.25 mL) on an insulin syringe.
Keep this calculation in your pocket. Save your vials, schedule and dose log in Dosify Me on iPhone or Android.
Informational use only — not medical advice. Check every reading against your own product's instructions.
10mg vial + 1mL BAC water = 25 units = 2.5mg — Frequency: weekly — Best taken: same day each week, with or without food
Full Tirzepatide dosing reference — reconstitution per vial size, dose-to-units table, side effects and sources.
Slows gastric emptying, which changes how other oral medications are absorbed — a single dose cut peak levels of oral contraceptives by over half in one study, and the label says to watch narrow-window oral drugs such as warfarin. It says nothing about thyroid medication. Combined with insulin or a sulfonylurea, the added blood-sugar-lowering effect can cause hypoglycemia — those doses often need to be reduced first. Talk to your prescribing doctor before combining, and ask about backup contraception if relevant.
Listed titration schedule: weeks 1-4 2.5mg, weeks 5-8 5mg, weeks 9-12 7.5mg, weeks 13-16 10mg. Higher doses (12.5-15mg) are also listed later in some schedules. The 10mg reference vial mixes to 10mg/mL, so 12.5mg is 125 units and 15mg is 150 units: more than the 100 units a 1mL syringe holds, so each is two draws. Larger vial size options are capped at ~3mL BAC water instead of diluted further, so they come out more concentrated (fewer units per dose) than this reference size.
Standard water for each Tirzepatide vial size in the Dosify Me data, and the concentration it gives. One unit is 0.01 mL on a U-100 insulin syringe.
| Vial | Vial contents | Bacteriostatic water | Concentration | Amount in one unit |
|---|---|---|---|---|
| 5 mg | 5000 mcg | 0.50 mL | 10 mg/mL | 100 mcg |
| 10 mg | 10000 mcg | 1.00 mL | 10 mg/mL | 100 mcg |
| 15 mg | 15000 mcg | 1.50 mL | 10 mg/mL | 100 mcg |
| 20 mg | 20000 mcg | 2.00 mL | 10 mg/mL | 100 mcg |
| 30 mg | 30000 mcg | 3.00 mL | 10 mg/mL | 100 mcg |
| 40 mg* | 40000 mcg | 3.00 mL | 13.33 mg/mL | 133.33 mcg |
| 50 mg* | 50000 mcg | 3.00 mL | 16.67 mg/mL | 166.67 mcg |
| 60 mg* | 60000 mcg | 3.00 mL | 20 mg/mL | 200 mcg |
| 100 mg* | 100000 mcg | 3.00 mL | 33.33 mg/mL | 333.33 mcg |
| 120 mg* | 120000 mcg | 3.00 mL | 40 mg/mL | 400 mcg |
* This size is conventionally mixed more concentrated rather than diluted further — fewer units per dose than smaller vials of this peptide.
| Quantity | 5 mg | 10 mg | 15 mg | 20 mg |
|---|---|---|---|---|
| 2.5 mg | 25 units | 25 units | 25 units | 25 units |
| 5 mg | 50 units | 50 units | 50 units | 50 units |
| 7.5 mg | 75 units | 75 units | 75 units | 75 units |
| 10 mg | 100 units | 100 units | 100 units | 100 units |
Label numbers from the Dosify Me data, used to show the arithmetic. Not a recommendation of any quantity.
At 10 mg/mL (the standard mix for vials up to 30 mg), 2.5 mg of Tirzepatide is 25.0 units on a 100-unit insulin syringe (0.250 mL).
At 10 mg/mL (the standard mix for vials up to 30 mg), 5 mg of Tirzepatide is 50.0 units on a 100-unit insulin syringe (0.500 mL).
At 10 mg/mL (the standard mix for vials up to 30 mg), 7.5 mg of Tirzepatide is 75.0 units on a 100-unit insulin syringe (0.750 mL).
0.50 mL, which gives 10 mg/mL. Larger vials hold at most 3 mL of water, so they are mixed more concentrated and need fewer units per dose.
1.00 mL, which gives 10 mg/mL. Larger vials hold at most 3 mL of water, so they are mixed more concentrated and need fewer units per dose.
1.50 mL, which gives 10 mg/mL. Larger vials hold at most 3 mL of water, so they are mixed more concentrated and need fewer units per dose.
Weekly. Same day each week, any time, with or without food Typical cycle: Often run continuously; tapering is done under guidance.
Yes. “tirz” is the short name people use for Tirzepatide in forums and search, and every figure on this page is for that same compound. The units, water and schedule above do not change with the spelling.
Published by San Tan Group, LLC, the company that makes the Dosify Me app. About Dosify Me
Figures come from the Dosify Me compound database for Tirzepatide: concentration is the vial amount ÷ the water volume, and syringe units are the volume in mL × 100 on a U-100 syringe.
Last checked: (changes only when the Tirzepatide data changes)
Dosify Me does this math for you. Pick the compound, your vial size and dose, and the app draws the exact syringe reading, keeps your schedule and reminders, and logs every dose — privately, on your phone.
General peptide calculator · BAC water calculator · Peptide dosing chart · How to reconstitute peptides · mcg to units chart
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