2.5 mg Tirzepatide Dosage Calculator
Calculate the exact units for your 2.5 mg tirzepatide starting dose across all available vial concentrations.
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Vial Concentration
How many units is 2.5 mg of Tirzepatide at 5 mg/mL?
Draw
50units
0.50 mL on a U-100 insulin syringe
For educational purposes only. Always follow your provider's instructions.
Quick Reference Table
All dose × concentration combinations
| Dose | 5 mg/mL | 10 mg/mL | 15 mg/mL | 25 mg/mL | 30 mg/mL | 60 mg/mL | 90 mg/mL | 100 mg/mL |
|---|---|---|---|---|---|---|---|---|
| 2.5 mg | 50 | 25 | 16.7 | 10 | 8.3 | 4.2 | 2.8 | 2.5 |
| 5 mg | 100* | 50 | 33.3 | 20 | 16.7 | 8.3 | 5.6 | 5 |
| 7.5 mg | 150* | 75* | 50 | 30 | 25 | 12.5 | 8.3 | 7.5 |
| 10 mg | 200* | 100* | 66.7* | 40 | 33.3 | 16.7 | 11.1 | 10 |
| 12.5 mg | 250* | 125* | 83.3* | 50 | 41.7 | 20.8 | 13.9 | 12.5 |
| 15 mg | 300* | 150* | 100* | 60* | 50 | 25 | 16.7 | 15 |
Values in U-100 insulin syringe units
* Exceeds 50 units (0.5 mL) — may require splitting into two injections
About the 2.5 mg Dose
The 2.5 mg dose is the starting dose for both Mounjaro and Zepbound during weeks 1 through 4. This introductory dose allows patients to acclimate to tirzepatide's dual GIP and GLP-1 receptor agonist mechanism. Most patients tolerate this dose well with mild or no gastrointestinal side effects before escalating to 5 mg.