Compounded Semaglutide and Tirzepatide Dosing Chart: mg to Units Converter

Why Do GLP-1 Prescriptions Use Both mg and Units?

A GLP-1 units to mg converter exists because your prescription is written in milligrams, the actual amount of medication, while your syringe is marked in units, a volume measurement from standard insulin syringes, where 100 units equals 1 milliliter of liquid. These are two different kinds of measurement doing two different jobs, and converting between them depends entirely on your medication’s concentration, how many milligrams are packed into each milliliter of liquid. That number is specific to your prescription and is not the same across every pharmacy.

Key takeaways

• mg measures how much medication you are getting. Units measure how much liquid volume that is, based on your syringe markings.
• The conversion works in both directions: dose to units, and units back to dose. Both formulas are covered below.
• AHC’s compounded tirzepatide is 20 mg per mL. AHC’s compounded semaglutide is 5 mg per mL. AHC ships these pre-mixed; you are not reconstituting powder yourself.
• Syringe type matters as much as concentration. This guide, like your actual prescription, assumes a standard U-100 syringe.

At a glance

How Does the mg to Units Conversion Actually Work?

The formula is straightforward once you have the concentration:

A higher concentration means fewer units deliver the same milligram dose. A lower concentration means more units are needed for that same dose. This is why two prescriptions for what sounds like “the same dose” can show completely different unit counts on the syringe, if they come from pharmacies using different concentrations.

How Do You Convert Units Back to a Dose in mg?

A GLP-1 units to mg converter works in both directions. Sometimes you want to go the other way, you know how many units you drew and want to confirm what dose that actually is. The formula reverses cleanly:

Worked example: 20 units drawn from AHC’s 5 mg/mL semaglutide means (20 × 5) ÷ 100 = 1 mg. The same 20 units from the 20 mg/mL tirzepatide means (20 × 20) ÷ 100 = 4 mg, a very different dose from an identical syringe mark, because the concentration is different.

To express any result in micrograms instead of milligrams, multiply the mg figure by 1,000. A 0.25 mg dose is 250 mcg.

How Does Vial Concentration Change the Math?

Every GLP-1 units to mg converter depends on this one variable. The table below is illustrative, showing how the identical number of syringe units delivers a different dose depending on concentration. Only two of these concentrations, 5 mg/mL and 20 mg/mL, are what AHC actually uses; the others are included so the pattern is clear if you are comparing a chart from a different source.

What Syringe Type Does This Assume?

Every formula and table in this guide assumes a standard U-100 insulin syringe, where 100 units equals 1 mL. This is what AHC provides and what the vast majority of GLP-1 prescriptions in the US use. It is worth knowing this is not universal: U-40 syringes exist, mostly for veterinary use, calibrated so that 40 units equals 1 mL, and U-500 syringes exist for a specific concentrated insulin product, calibrated the opposite direction. Drawing to “20 units” means a different volume entirely on a U-40 syringe than on a U-100 syringe. Confusing syringe types is a more serious error than a minor math mistake, since the volume difference is large. If you were ever given a syringe that does not look like the ones AHC has provided before, confirm with AHC support before using it.

Are AHC’s Medications Pre-Mixed, or Do You Reconstitute Anything?

Some compounded peptides ship as a freeze-dried powder that the patient or pharmacy mixes with bacteriostatic water before use, and in that model, the final concentration depends on how much water is added, not just what is printed on the vial. That is not how AHC works. AHC’s compounded semaglutide and tirzepatide ship pre-mixed as a liquid, already at the stated concentration, 5 mg/mL or 20 mg/mL. You are not measuring water or mixing anything yourself. If you have seen reconstitution instructions elsewhere online, they do not apply to an AHC prescription.

Compounded Tirzepatide: 20 mg per mL

This is the tirzepatide dosing chart most relevant to AHC prescriptions. AHC’s compounded tirzepatide is formulated at 20 mg per mL. At this concentration, the mg-to-unit relationship looks like this:

Compounded Semaglutide: 5 mg per mL

AHC’s compounded semaglutide is formulated at 5 mg per mL. At this concentration:

Each vial is designed to cover a 28-day period at your prescribed dose. These figures are provided for understanding the math behind your prescription, not as a substitute for it.

Can You Use the Same Units Count for Semaglutide and Tirzepatide?

No. Semaglutide and tirzepatide are different molecules with different potencies and different dose-escalation schedules. A given number of units, or even a given number of milligrams, on one does not correspond to any equivalent amount on the other. If you are switching between the two, your provider determines the correct starting point; it is never a matter of matching the unit count or the mg number from your previous prescription.

How Do FDA-Approved Brand Products Titrate, for Reference?

This is general reference information about the FDA-approved brand products, shown for context. It is not AHC’s own titration schedule, which is individualized and comes from your provider.

AHC’s compounded titration follows the same general low-to-high principle but is set by your provider based on your individual response, not a fixed brand schedule.

What Are the Most Common Dosing Mistakes?

Most mistakes with a GLP-1 units to mg converter come from one of these five habits.

• Using leftover units math from a previous vial with a different concentration. If your concentration changes for any reason, the same unit count no longer means the same dose.
• Confusing mg, mL, and units as if they were interchangeable, rather than three different measurements of the same thing.
• Assuming a syringe from a different source uses the same U-100 scale AHC provides.
• Misreading a small tick mark on the syringe, particularly at low-volume doses where each mark represents a meaningful difference.
• Increasing a dose without provider guidance because a previous week “felt fine.” Titration timing is not the same as feeling ready.

Where Does Your Actual Dose Come From?

Your specific dose and titration schedule come from your provider, sent by email after your order is approved, based on your individual evaluation. That instruction, not a general chart, is the number to follow. This guide exists to help the mg and unit numbers on your own instructions make sense, not to replace them.

What Should You Do If Something Looks Off?

• If the unit count on your prescription does not match what you would expect from the concentrations above, do not adjust anything yourself.
• Contact AHC support by live chat or at [email protected] to confirm the numbers before your next dose.
• Never use a chart from a different source, a different pharmacy, or a different concentration to double-check or override what your own prescription says.
• Never adjust your dose based on how a previous week felt. Dose changes go through your provider, following the titration schedule you were given.
• If you believe you injected significantly more than intended and are experiencing symptoms like persistent vomiting, fainting, or severe abdominal pain, contact your provider or seek emergency care directly rather than waiting.

For the full explanation of how compounded medications work and how AHC’s pharmacy relationship is structured, see the Complete Guide to Compounded Semaglutide and Tirzepatide.

Frequently Asked Questions

Why are GLP-1 doses measured in both mg and units?

This is exactly what a GLP-1 units to mg converter solves. Milligrams measure the actual amount of medication. Units measure the volume on a standard insulin syringe, where 100 units equals 1 mL. Converting between them, in either direction, requires knowing your medication’s concentration.

What is AHC’s tirzepatide concentration?

20 mg per mL.

What is AHC’s semaglutide concentration?

5 mg per mL.

How do I convert units back into a dose in mg?

Multiply the units drawn by the concentration in mg/mL, then divide by 100. For example, 20 units at AHC’s 5 mg/mL semaglutide concentration equals 1 mg.

How do I convert a dose to mcg instead of mg?

Multiply the mg figure by 1,000. A 0.25 mg dose equals 250 mcg.

Do I need to reconstitute AHC’s medication with water before use?

No. AHC’s compounded semaglutide and tirzepatide ship pre-mixed as a ready-to-use liquid at the stated concentration. Reconstitution instructions you may see elsewhere online apply to a different kind of product, not an AHC prescription.

Does the same number of units mean the same dose for semaglutide and tirzepatide?

No. The two medications have different concentrations and different potencies. The same unit count delivers a different dose on each, and they are never directly interchangeable.

Can I use a dosing chart I found online for my AHC prescription?

Only if it is built for the exact same concentration as your AHC prescription. A chart built for a different concentration will give incorrect unit counts even if it is labeled with the same drug name.

What syringe type does this guide assume?

A standard U-100 insulin syringe, where 100 units equals 1 mL. This is what AHC provides. U-40 and U-500 syringes exist for other purposes and use a different scale entirely.

What should I do if I think I injected too much?

If you are experiencing symptoms like persistent vomiting, fainting, or severe abdominal pain, seek medical care directly. Otherwise, contact AHC support to review what happened before your next scheduled dose.

How long does one vial last?

Each GLP-1 vial is designed to cover a 28-day period at your prescribed dose.

Can I change my own dose if I think the units are wrong?

No. Dose changes always go through your provider. Confirm any concern with AHC support first.

Medical disclaimer

This article is for informational purposes only and explains general unit-conversion math for AHC’s standard compounded concentrations. It is not a substitute for your individual prescription and dosing instructions, which are sent by your provider after an individual evaluation. Never adjust your dose based on this or any other general reference. Contact AHC support with any question about your specific prescription. If you are experiencing a medical emergency, call 911. Semaglutide and tirzepatide are prescription medications available only after an individual evaluation by a licensed provider.