How many units is 0.25 mg of semaglutide?

There is no single answer: 0.25 mg of semaglutide is a different number of units at every vial strength, because on a U-100 insulin syringe units = mg ÷ (mg/mL) × 100. Find the mg/mL on your vial or pharmacy label, then read its row below or enter it in the semaglutide units calculator.

Ozempic and Wegovy have no units to count. Their pens are set in mg or come with the dose already set, so units only matter when compounded semaglutide is drawn from a vial with an insulin syringe.

0.25 mg in units at example strengths

These strengths come from a 5 mg or 10 mg vial mixed with 1, 2 or 2.5 mL, the examples on the semaglutide 5 mg and semaglutide 10 mg pages. They’re examples, not recommendations. A compounded vial is whatever strength the pharmacy made, so a reading from someone else’s vial tells you nothing about yours.

How many mL and U-100 units 0.25 mg is at each strength.

Strength	Volume	Units (U-100)
2 mg/mL	0.125 mL	12.5 units
2.5 mg/mL	0.1 mL	10 units
4 mg/mL	0.063 mL	6.3 units
5 mg/mL	0.05 mL	5 units
10 mg/mL	0.025 mL	2.5 units

The same amount is a different number of units at each strength, so check the mg/mL on your vial or pharmacy label. U-100 syringe: 100 units = 1 mL.

At every strength here, 0.25 mg is a small volume, and some rows land between two printed lines. Read the mark against the scale on your own syringe, and ask your pharmacist how to handle a reading that falls between lines. The syringe reader shows what each line is worth on 30, 50 and 100-unit syringes.

Why “0.25 mg = 5 units” is not a rule

The FDA’s July 2024 alert on compounded semaglutide gives this exact amount as an example of a prescribing error: “One provider intended to dose 0.25 milligrams (5 units), but prescribed 25 units instead, leading to a patient receiving five times the intended dose and experiencing severe vomiting” (FDA).

That “5 units” only holds for one strength. Here is what those two readings hold at that strength:

The amount in each syringe reading at 5 mg/mL.

Reading	Volume	Amount
5 units	0.05 mL	250 mcg
25 units	0.25 mL	1.25 mg

U-100 syringe: 100 units = 1 mL. At a different strength the same reading holds a different amount.

At any other strength in the table above, the same 0.25 mg sits on a different mark. A units instruction copied from a forum, a friend or an old vial can be off by several times.

Where 0.25 mg sits on the Ozempic and Wegovy labels

• Ozempic: “Initiate OZEMPIC with a dosage of 0.25 mg injected subcutaneously once weekly for 4 weeks.” Then: “After 4 weeks on the 0.25 mg dosage, increase the dosage to 0.5 mg once weekly.” The label’s maintenance doses are 0.5 mg, 1 mg or 2 mg (Ozempic label).
• Wegovy: “The recommended starting dosage of WEGOVY injection is 0.25 mg administered subcutaneously once weekly.” Table 1 gives it for weeks 1 through 4, and the steps that follow are there “to reduce the risk of gastrointestinal adverse reactions” (Wegovy label).

These are label facts, quoted for reference. Follow your prescriber, who decides your dose and when it changes.

How the branded products give 0.25 mg

The Ozempic pen instructions say “Always use the dose counter and the dose pointer to see how many mg you select” and “Do not set the dose by counting the number of clicks you hear.” Wegovy FlexTouch can’t give 0.25 mg at all: “You can only select doses of 2.4 mg” (Ozempic label; Wegovy label).

Questions people ask