A semaglutide weight loss dosage chart in units explained, with typical weekly titration steps, syringe markings, and safety notes for US patients.
The short answer is that the number of units in a semaglutide dose depends on the concentration of the liquid in your vial, not on the milligram dose alone. A 0.25 mg dose equals 5 units of a 5 mg/mL solution but only 2.5 units of a 10 mg/mL solution. A semaglutide weight loss dosage chart in units is accurate only when it also states the concentration printed on the vial, pen, or pharmacy label.
Units measure volume, while milligrams measure the active drug. Confusing those two ideas is one of the most common and most avoidable dosing errors with compounded semaglutide.
Units vs. Milligrams: What Each One Actually Measures
A unit is not a fixed amount of medication. On a standard U-100 syringe, 100 units equal 1 milliliter (mL), so 1 unit is 0.01 mL of liquid.
How much drug that volume contains depends entirely on concentration:
- 2.5 mg/mL: 1 unit = 0.025 mg of semaglutide
- 5 mg/mL: 1 unit = 0.05 mg
- 10 mg/mL: 1 unit = 0.10 mg
- 20 mg/mL: 1 unit = 0.20 mg
The math is simple: units = (dose in mg ÷ concentration in mg/mL) × 100.
Semaglutide Weight Loss Dosage Chart in Units (5 mg/mL Example)
Most compounded semaglutide dispensed in the United States is labeled 5 mg/mL, which makes it the most common reference point. Many people searching for a semaglutide weight loss dosage chart units version are looking for exactly this table.
| Titration step | Weekly dose | Volume | Units on a U-100 syringe | Typical timing |
|---|---|---|---|---|
| 1 | 0.25 mg | 0.05 mL | 5 units | Weeks 1–4 |
| 2 | 0.5 mg | 0.10 mL | 10 units | Weeks 5–8 |
| 3 | 1 mg | 0.20 mL | 20 units | Weeks 9–12 |
| 4 | 1.7 mg | 0.34 mL | 34 units | Weeks 13–16 |
| 5 | 2.4 mg | 0.48 mL | 48 units | Week 17 and beyond (maintenance) |
Your starting semaglutide dosage for weight loss is usually 0.25 mg once weekly for the first four weeks. The dose increases only if you tolerate it.
Doses are generally raised no more often than every four weeks. Moving faster than the schedule raises the risk of nausea, vomiting, and dehydration.
Concentration Changes the Units, Not the Dose
A semaglutide weight loss dosage chart 10mg vial will show half the units of a 5 mg/mL vial for the same milligram dose. That is the single most important detail to confirm before drawing up a syringe.
| Vial concentration | 0.25 mg | 0.5 mg | 1 mg | 1.7 mg | 2.4 mg |
|---|---|---|---|---|---|
| 2.5 mg/mL | 10 units | 20 units | 40 units | 68 units | 96 units |
| 5 mg/mL | 5 units | 10 units | 20 units | 34 units | 48 units |
| 10 mg/mL | 2.5 units | 5 units | 10 units | 17 units | 24 units |
| 20 mg/mL | 1.25 units | 2.5 units | 5 units | 8.5 units | 12 units |
If your pharmacy switches suppliers or you refill at a different strength, your units change even though your milligram dose stays the same. Confirm the new volume with your prescriber or pharmacist before your next injection.
Branded Pens vs. Compounded Vials
Wegovy and Ozempic are supplied as pre-filled pens, and neither product is dosed in units. Wegovy single-dose pens deliver 0.25 mg, 0.5 mg, 1 mg, 1.7 mg, or 2.4 mg automatically. Ozempic pens are dialed in clicks rather than units.
An ozempic for weight loss dosage chart is sometimes followed off-label, but the numbers on it are clicks and milligrams, not units. Ozempic is FDA-approved for type 2 diabetes and not for weight loss. Compounded semaglutide is the only common form where a unit-based chart applies, and compounded semaglutide is not FDA-approved.
How Semaglutide and Tirzepatide Dosing Compare
A tirzepatide vs semaglutide dosage for weight loss comparison usually starts with titration speed. Tirzepatide typically begins at 2.5 mg weekly and steps up toward 15 mg, while semaglutide for weight loss begins at 0.25 mg and tops out at 2.4 mg weekly.
Both medications use the same unit math. The syringe volume is set by the concentration of the vial, not by the name of the drug on the label.
How to Read Your Syringe Without Guessing
- Confirm the syringe is U-100, which means 100 units per mL. A U-40 syringe will deliver a completely different dose.
- Check the concentration on the vial label every single time, even for a refill from the same pharmacy.
- Draw to the mark at eye level and tap out air bubbles before measuring.
- Never estimate between two marks or round up to the next line.
- Use a new needle and syringe for every dose, and store the vial as directed.
Safety Notes and Red Flags
Semaglutide commonly causes nausea, vomiting, diarrhea, constipation, and stomach pain, especially in the first weeks after a dose increase. Smaller meals and less high-fat food often help.
Contact a healthcare professional promptly for severe or persistent abdominal pain, signs of dehydration, or vision changes. Semaglutide carries warnings about pancreatitis, gallbladder disease, and thyroid C-cell tumors, and it is not recommended during pregnancy.
Never adjust your units or concentration on your own. A prescriber or pharmacist can verify the correct volume for your specific vial, and that check takes less than a minute.
The Bottom Line
A unit-based semaglutide chart is a conversion tool, not a universal dosing table. The milligram dose comes from your prescriber, and the units come from the concentration printed on your vial.
Verify the concentration before every dose, and treat any chart that omits the concentration as incomplete. When in doubt, ask your pharmacist to confirm the volume in units.
Frequently Asked Questions
How many units is 1 mg of semaglutide?
It depends on the concentration of your vial. At 5 mg/mL, 1 mg equals 20 units on a U-100 syringe, while at 10 mg/mL, 1 mg equals 10 units. Always read the concentration on the label before calculating, because the same milligram dose can be double or half the units at a different strength.
Is Wegovy or Ozempic dosed in units?
No. Wegovy single-dose pens deliver a fixed dose automatically, and Ozempic pens are dialed in clicks rather than units. Units only apply when semaglutide is drawn from a compounded multi-dose vial with a syringe, and compounded semaglutide is not FDA-approved.
What is the starting dose of semaglutide for weight loss?
The standard starting dose is 0.25 mg once weekly for four weeks, followed by 0.5 mg weekly for the next four weeks. Doses are then increased in steps toward a maintenance dose of 2.4 mg weekly if the medication is tolerated. Your prescriber sets the schedule and may keep you at a lower dose if side effects are strong.
This page provides educational research information and does not replace medical advice, diagnosis, or treatment.