Dual GIP/GLP-1 Receptor Agonist15 mg

15 mg Tirzepatide Dosage Calculator

Convert the maximum 15 mg tirzepatide maintenance dose to exact units for your vial concentration.

050100

How many units is 15 mg of Tirzepatide at 5 mg/mL?

Draw

300units

3.00 mL on a U-100 insulin syringe

15 mg ÷ 5 mg/mL × 100 = 300 units

This dose exceeds 50 units (0.5 mL). Volumes greater than 0.5 mL may be uncomfortable for subcutaneous injection. Consult your provider about splitting the dose into two injections.

For educational purposes only. Always follow your provider's instructions.

Quick Reference Table

All dose × concentration combinations

Dose5 mg/mL10 mg/mL15 mg/mL25 mg/mL30 mg/mL60 mg/mL90 mg/mL100 mg/mL
2.5 mg502516.7108.34.22.82.5
5 mg100*5033.32016.78.35.65
7.5 mg150*75*50302512.58.37.5
10 mg200*100*66.7*4033.316.711.110
12.5 mg250*125*83.3*5041.720.813.912.5
15 mg300*150*100*60*502516.715

Values in U-100 insulin syringe units

* Exceeds 50 units (0.5 mL) — may require splitting into two injections

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About the 15 mg Dose

The 15 mg dose is the maximum maintenance dose for both Mounjaro and Zepbound, reached at week 21 and continued indefinitely. This is the highest approved dose of tirzepatide and the dose that produced the most dramatic results in the SURMOUNT clinical trials, with average weight loss of approximately 22.5% of body weight at 72 weeks. Patients at this dose have completed a full 20-week titration.

Frequently Asked Questions

In a 30 mg/mL vial, 15 mg tirzepatide equals 50 units. The math is (15 / 30) x 100 = 50 units. In a 25 mg/mL vial, it would be 60 units. In a 60 mg/mL vial, it would be 25 units.

The standard titration schedule reaches 15 mg at week 21. The full path is: 2.5 mg (weeks 1-4), 5 mg (weeks 5-8), 7.5 mg (weeks 9-12), 10 mg (weeks 13-16), 12.5 mg (weeks 17-20), and 15 mg (weeks 21 onward). This 20-week ramp-up minimizes gastrointestinal side effects.

At 15 mg per week, you need approximately 60 mg of tirzepatide per month (4 weekly injections). Over 3 months, that totals about 180 mg. Knowing your monthly consumption helps when evaluating vial sizes and concentration options. Higher concentration vials like 60 mg/mL or 100 mg/mL require less injection volume at this dose.

The SURMOUNT-2 and STEP trials suggest that 15 mg tirzepatide produces greater average weight loss (approximately 22.5%) compared to 2.4 mg semaglutide (approximately 15%). However, individual results vary significantly. Tirzepatide's dual GIP and GLP-1 receptor agonism may account for the additional efficacy, though both medications are considered highly effective for weight management.

Other Tirzepatide Doses

2.5 mg Tirzepatide5 mg Tirzepatide7.5 mg Tirzepatide10 mg Tirzepatide12.5 mg Tirzepatide

Related Pages

Tirzepatide CalculatorTirzepatide Dosing

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