Finding Your Tirzepatide Concentration

Using Mounjaro® or Zepbound® pens?
You don't need this guide. Your pen is pre-dosed - just follow your doctor's instructions.

This guide is for compounded tirzepatide from compounding pharmacies only.

❓ What Does Your Label Look Like?

Jump to your label type:

→ Standard Format: "5 mg/mL"
→ Partial mL: "2.5mg/0.5mL"
→ Multiple Ingredients: "Tirzepatide/B12"
→ Powder Vial (needs mixing)
→ Common Mistakes to Avoid

What You're Looking For

Your vial label shows the concentration - this tells you how much tirzepatide is in each milliliter (mL) of liquid.

Look for: A number followed by "mg/mL" (like 5mg/mL or 10mg/mL)

Why it matters: The concentration determines how much liquid you need to draw into your syringe for each dose. Using the wrong number means getting the wrong dose.

Understanding Your Label

Your pharmacy label might show concentration in different ways. Here are the three most common formats:

Format 1: Standard (mg/mL)

COMPOUNDED MEDICATION
Tirzepatide 5 mg/mL

For subcutaneous injection only
Qty: 2mL  Rx#: 12345
Exp: 03/24/2025
Store refrigerated (2-8°C/36-46°F)

This is the simplest format - the concentration is clearly stated.

✅ Enter "5" in the calculator

Format 2: Partial mL (mg/0.5mL)

COMPOUNDED MEDICATION
Tirzepatide 2.5mg/0.5mL

Total Volume: 2mL
For subcutaneous injection only
Rx#: 67890
Exp: 04/15/2025
Keep Refrigerated

Quick conversion needed: When you see "0.5mL" (half of 1mL), double the first number.

Calculation:

• Label shows: 2.5mg/0.5mL
• Double it: 2.5mg × 2 = 5mg/mL

✅ Enter "5" in the calculator

Format 3: With Additives (Multiple Ingredients)

COMPOUNDED MEDICATION
Tirzepatide/Vitamin B12
5/500 mg/mL

Volume: 2mL  Rx#: 13579
Exp: 03/30/2025
Store in refrigerator

Key rule: Only the tirzepatide number matters. Ignore B12, niacinamide, or other additives.

How to find it:

• Find "Tirzepatide" in the ingredient list
• Note its position (first, second, etc.)
• Use the concentration number in that same position
• In this example: Tirzepatide is first, so use the first number (5 mg/mL)

✅ Enter "5" in the calculator
(Ignore the B12 and its 500 - it doesn't affect your tirzepatide dosing)

If You Have Powder (Reconstitution Needed)

Some pharmacies provide tirzepatide as a powder that you mix with bacteriostatic water.

To find your concentration:

1. Check the vial label for total tirzepatide amount (e.g., "10mg")
2. Check how much water you're adding (usually 2mL or 3mL)
3. Divide: Total mg ÷ Total mL = Concentration

Example:

• Powder vial: 10mg tirzepatide
• Add: 2mL bacteriostatic water
• Calculation: 10mg ÷ 2mL = 5mg/mL

✅ Enter "5" in the calculator

Common Mistakes to Avoid

❌ Mistake 1: Confusing Total Content with Concentration

Wrong: "My vial says 10mg, so the concentration is 10mg/mL"

Right: A "10mg vial" is the total amount. You need to know the liquid volume:

• 10mg in 2mL = 5mg/mL concentration
• 10mg in 4mL = 2.5mg/mL concentration

❌ Mistake 2: Not Converting Partial mL

Wrong: "2.5mg/0.5mL means 2.5mg/mL"

Right: 0.5mL is half of 1mL, so double it: 2.5mg × 2 = 5mg/mL

❌ Mistake 3: Using Additive Numbers

Wrong: Using "500" from "Tirzepatide/B12: 5/500 mg/mL"

Right: Only use the tirzepatide number (5mg/mL). Ignore B12, niacinamide, glycine, and other additives.

❌ Mistake 4: Mixing Up mg and mcg

Watch out: Some additives are measured in micrograms (mcg) or IU

Remember: Tirzepatide is always in milligrams (mg). If you see "500mcg" on your label, that's an additive, not your tirzepatide concentration.

Quick Reference: Common Concentrations

Still Confused?

Can't find the concentration on your label?

• Contact your compounding pharmacy directly
• Ask them: "What is the concentration in mg/mL?"
• Have them confirm before using the calculator

Ready to calculate your dose?

This information is for educational purposes only. Always verify your medication concentration with your healthcare provider or pharmacist before dosing.

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