See exactly how many units equal your tirzepatide mg dose at 5, 10, and 20 mg/mL, plus the full titration schedule and missed-dose guidance.
Brand-name tirzepatide pens like Mounjaro and Zepbound arrive pre-filled. You click a button, and a fixed milligram dose is delivered. There's no math involved.
Personalized tirzepatide works differently. Your prescribing pharmacy prepares your medication as a liquid vial at a specific concentration, measured in milligrams per milliliter. You draw your dose using a U-100 insulin syringe, marked in units rather than milligrams. That means the same 5 mg dose can look like a completely different number of units depending on how concentrated your specific vial is.
This is the part most generic charts skip. A units-to-mg conversion chart is only accurate for one specific concentration at a time. Before you use any chart, including this one, confirm the concentration printed on your vial label with your HealthiCare care team.
This guide shows you how to convert a prescribed tirzepatide dose in milligrams into insulin syringe units using one straightforward formula, walks through worked examples at several concentrations, and explains the HealthiCare personalized schedule, what to do if you miss a dose, and where to get dosing support. Throughout, two things control your actual dose: the concentration printed on your current vial label and the instructions from your prescriber.
None of this replaces your physician's specific instructions. It's meant to make those instructions easier to follow with confidence.
The chart below uses 5 mg/mL, 10 mg/mL, and 20 mg/mL as worked examples so you can see the formula in action. These are illustrations, not universal concentrations. Find the concentration printed on your current vial label, then match it to the chart or run your exact numbers through the calculator above.
If your calculation comes out above 100 units, compare the result with the syringe you were supplied. U-100 describes a concentration of 100 units per milliliter, and individual syringes can have different capacities and markings, so the result may be more than your syringe can hold or measure accurately. Do not split the dose, estimate, or improvise based on this chart. Contact your prescribing care team and follow their instructions for your specific vial and syringe.
The table below shows the HealthiCare personalized tirzepatide schedule, with steps at 1.5, 3, 6, 9, 11, and 13.5 mg. This is not the FDA-approved Zepbound schedule, and it was not the schedule tested in clinical trials. Your prescriber determines your dosing, and your prescribed instructions control at every step.
In the SURMOUNT-5 trial, adults with obesity but without type 2 diabetes received maximum tolerated tirzepatide at 10 or 15 mg, or semaglutide at 1.7 or 2.4 mg, once weekly for 72 weeks. Mean weight change was minus 20.2 percent with tirzepatide and minus 13.7 percent with semaglutide. Those results reflect the specific doses and participants studied. The trial did not test the HealthiCare personalized schedule, and it does not predict any individual's outcome.
Not every patient moves through all six steps on schedule, and that's not a sign anything is wrong. Your physician may hold you at a lower dose for an extra few weeks if you're experiencing nausea or other side effects, or because you're already seeing the appetite control and weight change you were hoping for.
A weight plateau after several months on a stable dose is common and doesn't automatically mean you need a higher dose. Your care team will look at your full picture, including nutrition and activity, before recommending a change.
HealthiCare's personalized tirzepatide may include vitamin B12. There is not enough evidence that B12 adds weight loss or prevents common tirzepatide side effects.
B12 also does not change the syringe math. Your calculation still uses your prescribed tirzepatide dose in milligrams and the tirzepatide concentration printed on your vial label. If anything on your label looks different from what you expected, confirm with your care team before injecting.
Tirzepatide has a long half-life of roughly five days, which gives you some flexibility if you miss your usual injection day.
These missed-dose instructions come from the FDA-approved Zepbound label, revised February 2026; if your prescribed schedule differs or you are unsure what to do, follow up with your provider before taking a dose.
A quick check before you draw your dose catches most of the errors that cause dosing confusion in the first place.
Dosing questions are normal, and you do not have to sort them out alone. If you are still comparing options, our tirzepatide and semaglutide comparison explains how the two medications differ. If side effects are on your mind, our guide to GLP-1 side effects covers what is common and when to check in. If you are new to self-injection, our injection-site guide walks through where and how to inject.
If you already have a HealthiCare prescription, your care team can answer dose-specific questions through your account. If you are exploring personalized tirzepatide treatment, the section below explains how the online care process works.
It depends on your vial's concentration. At 5 mg/mL, 2.5 mg is 50 units. At 10 mg/mL, it's 25 units. At 20 mg/mL, it's 12.5 units. Check your label before drawing your dose.
The FDA-approved schedule for Zepbound, the brand-name tirzepatide approved for weight management, starts at 2.5 mg once weekly for four weeks, then increases by 2.5 mg after at least four weeks at each step. The maintenance doses are 5, 10, or 15 mg once weekly, and 15 mg is the maximum. HealthiCare's personalized schedule is different: it uses steps at 1.5, 3, 6, 9, 11, and 13.5 mg, and the prescriber determines your dosing. Your prescribed instructions, not any general schedule, control your dose.
No. Your unit count should always match the milligram dose your physician prescribed at your current vial concentration. Adjusting units on your own changes your actual medication dose, which is a decision for you and your provider together, not something to experiment with.
Because different preparing pharmacies use different concentrations. A chart built for a 10 mg/mL vial won't match a 20 mg/mL vial, even though the milligram dose is identical. Always match the chart to your specific label.
This is common at higher concentrations. A syringe with finer unit markings, or a slightly different concentration, can resolve it. Ask your HealthiCare team which syringe fits your prescription.
Take it within 4 days of the missed date. After 4 days, skip it and resume your regular schedule the following week.
No. Adding B12 does not change your tirzepatide dose or the syringe math. You still convert your prescribed tirzepatide dose using the tirzepatide concentration printed on your vial label. HealthiCare's personalized tirzepatide may include B12, but there is not enough evidence that B12 adds weight loss or prevents common side effects, so it is not a reason to draw up more or less tirzepatide.
August 10, 2026
