How Many Units Is 5 mg of Tirzepatide? Conversion Chart by Vial Strength
Drawing the right dose of compounded tirzepatide starts with one question: how many syringe units equal 5 mg on your specific vial label? Get the exact number below.
Five milligrams (mg) of compounded tirzepatide equals anywhere from 20 to 100 units on a U-100 insulin syringe, depending on the vial’s concentration. Divide the dose (5 mg) by the mg per mL printed on your pharmacy label, then multiply by 100 because a U-100 syringe shows 100 units per mL. Checking this math before every draw prevents accidental under- or overdosing.
- Compounded tirzepatide vials are typically labeled 5, 10, 15, 20 or 25 mg per mL (mg/mL).
- On a U-100 syringe, 1 mL equals 100 units, so volume (mL) × 100 gives you units.
- A 5 mg dose drawn from a 10 mg/mL vial is 0.5 mL, or exactly 50 units.
- Measuring with a 1 mL U-100 syringe improves accuracy for doses above 30 units.
- Always use the sterile syringe, needle gauge, and injection site your prescriber recommends to lower contamination or injury risk.
What compounded tirzepatide is and why units matter
Compounded tirzepatide is a pharmacist-prepared liquid form of the dual GIP/GLP-1 receptor agonist tirzepatide that is mixed to the exact concentration your prescriber orders. Unlike factory-filled single-dose pens, compounded vials require you to draw each dose with a syringe calibrated in units. Units correspond to volume, not potency, so knowing the conversion prevents dosing errors.
Tirzepatide is… a once-weekly injectable incretin medication that improves blood sugar control and can reduce body weight by up to 8-13 kg in 12-24 weeks in clinical trials (Snaith et al., 2026) (Berry et al., 2026). Its compounded form is not FDA-approved and is prepared only when a prescriber determines you need a different formulation or concentration than the commercial products.
How to convert 5 mg of tirzepatide to syringe units
The math is a two-step equation: Volume (mL) = Dose (mg) ÷ Concentration (mg/mL). Then Units = Volume (mL) × 100.
Example for a 10 mg/mL vial:
5 mg ÷ 10 mg/mL = 0.5 mL
0.5 mL × 100 units/mL = 50 units
Write the calculation on a sticky note and keep it with your supplies until it becomes second nature.
5 mg tirzepatide conversion chart by vial strength
Use the table below for any common concentration. Round to the nearest whole unit on your syringe.
| Vial label strength (mg/mL) | Volume for 5 mg (mL) | Syringe setting (units) |
|---|---|---|
| 5 mg/mL | 1.0 mL | 100 units |
| 10 mg/mL | 0.5 mL | 50 units |
| 15 mg/mL | 0.33 mL | 33 units* |
| 20 mg/mL | 0.25 mL | 25 units |
| 25 mg/mL | 0.20 mL | 20 units |
*Draw to the 33-unit mark or the first small line after 30 if your syringe marks single units.
How to measure 5 mg accurately every time
Consistent technique prevents under- or overdosing.
Read the label first: Concentration can change when you refill, so verify mg/mL before drawing.
Prime the syringe: Pull back a small amount of air equal to your dose volume, inject into the vial to avoid creating a vacuum, then draw.
Draw at eye level: Hold the syringe vertically with the needle in the liquid and align the meniscus with the exact unit mark.
Tap out bubbles: Flick the barrel gently and push the plunger to eliminate air pockets, then re-confirm the unit mark.
Double-check with a partner: If you are new to injections, having someone confirm the units can reduce anxiety and mistakes.
Picking the right syringe and needle
Use a 1 mL U-100 insulin syringe for 5 mg doses drawn above 30 units. For 25 units or less, a 0.5 mL syringe offers finer graduations and easier reading.
Needle gauge: 29-31 G needles are thin enough for subcutaneous injections while maintaining strength.
Needle length: 6-8 mm is adequate for most adults. Shorter needles may lead to intradermal placement; longer needles increase risk of intramuscular injection.
See our full supply checklist in the related guide needle size for tirzepatide.
Storage, re-use, and shelf-life tips
Refrigerate unopened vials at 36-46 °F. After first puncture, most compounded pharmacies recommend disposing after 28 days; follow your label.
Never re-use needles: Re-inserting dull needles can damage rubber stoppers and introduce bacteria.
If your vial warms above 77 °F for more than 24 hours, contact the pharmacy before using another dose.
You can learn more in our temperature excursion guide.
What a 5 mg dose costs and how to save
Cost varies by concentration, pharmacy fees, and shipping. Doses do not cost less just because you draw fewer units-pricing is usually per mg.
| Source | Monthly price for 5 mg/week (approx. 20 mg/month) | What’s included |
|---|---|---|
| Rx.com weight-loss program (12-month plan) | $149 | Online visit, compounded tirzepatide at any dose, syringes, shipping |
| Typical telehealth clinic | $249 - $450 | Medication only, visit and supplies may be extra |
| Local 503A compounding pharmacy | $180 - $300 | Medication pick-up, no visit, supplies separate |
Wherever you buy, confirm whether the price includes titration up to higher doses, or if you will face upcharges later. For a deeper dive, see our comparison cheapest tirzepatide online.
Ready to draw your 5 mg dose today?
Check the column that fits your situation:
✅ Good to inject
- Vial label matches your prescription (mg/mL verified)
- You calculated and located the correct unit mark
- Syringe and needle are sterile, within expiry
- Solution is clear, colorless, and particle-free
- Injection site is clean and rotated from last week
🏥 Pause and call your provider
- Concentration on refill is different than before
- You cannot calculate the units with confidence
- Solution looks cloudy, crystallized, or tinted
- You drew the wrong amount or injected twice
- You feel severe nausea, vomiting, or dizziness after dosing
🚨 When to Contact Your Healthcare Provider
Contact your doctor immediately if you experience any of the following:
- Severe stomach pain - could signal pancreatitis, a known GLP-1 class risk.
- Persistent vomiting or inability to keep liquids down - risk of dehydration.
- Signs of allergic reaction such as rash, swelling, or breathing difficulty.
- Accidentally injected more than one 5 mg dose - risk of profound nausea or hypoglycemia especially if using insulin.
- Blood sugar below 54 mg/dL (severe hypoglycemia) after dosing.
- Yellowing of eyes or skin - could indicate gallbladder or liver issues.
- Severe constipation lasting more than 7 days despite laxatives.
- Sudden changes in vision - report promptly for retinal evaluation.
Scientific References
- Snaith JR, Frampton R, Samocha-Bonet D, et al. Tirzepatide in Adults With Type 1 Diabetes: A Phase 2 Randomized Placebo-Controlled Clinical Trial. Diabetes Care. 2026.
- Berry SA, Goodman IR, McNally E, et al. Real-World Effectiveness and Safety of Tirzepatide in Type 1 Diabetes and Obesity: Impact on Glycaemia, Weight, and Cardiometabolic Risk Markers. Diabetes Obes Metab. 2026.
Frequently Asked Questions
Is an insulin syringe the only option for injecting compounded tirzepatide?
Yes. Compounded tirzepatide is dispensed in multi-dose vials, so you must draw the liquid with a U-100 insulin syringe to ensure accurate dosing. Pen needles will not attach to the vial.
Can I split my 5 mg weekly dose into two smaller injections?
Your prescriber may allow twice-weekly half-doses to reduce stomach side effects, but you must recalculate units for 2.5 mg. For example, from a 10 mg/mL vial, 2.5 mg is 25 units.
What if my compounded tirzepatide is 12 mg/mL?
Uncommon strengths follow the same formula: 5 mg ÷ 12 mg/mL = 0.417 mL, then × 100 = 42 units. Round to the nearest whole unit.
How many units is 5 mg if I only have a half-mL syringe?
Half-mL syringes are marked to 50 units. If your calculation exceeds 50 units (for example, 100 units from a 5 mg/mL vial), you need a 1 mL syringe or must inject in two equal halves after consulting your provider.
Do units equal international units of insulin?
No. Syringe units are simply volume markers based on a U-100 standard that 100 units equals 1 mL. They do not indicate potency of tirzepatide.
Is compounded tirzepatide less potent than commercial versions?
Potency should match the labeled concentration if produced by a reputable 503A pharmacy that performs stability and sterility testing. However, compounded tirzepatide is not FDA-approved and quality can vary, so choose a trusted source.
Where can I find conversions for other doses like 10 mg?
See our full guide 10 mg tirzepatide units conversion for step-by-step tables.
What should I do if I miss my 5 mg dose?
If it is within 48 hours of your scheduled time, inject the missed dose as soon as possible. If more than 48 hours have passed, skip it and resume the next scheduled dose. Do not double up.
