How many units is 0.5 mg of semaglutide?

How many units 0.5 mg of semaglutide is depends entirely on your vial’s strength: on a U-100 syringe, divide 0.5 mg by the mg/mL and multiply by 100. Look up your vial’s mg/mL in the table below, or type it into the semaglutide units calculator along with your syringe size.

If you use Ozempic or Wegovy, you won’t see units anywhere. Ozempic’s pen counter shows mg, and Wegovy’s 0.5 mg pen and syringe each hold one fixed dose.

0.5 mg in units at example strengths

The strengths in this table are what a 5 mg or 10 mg vial makes with 1, 2 or 2.5 mL of water, as on the semaglutide 5 mg and semaglutide 10 mg pages. Treat them as examples only: your pharmacy’s label is the only source for your vial’s strength.

How many mL and U-100 units 0.5 mg is at each strength.

Strength	Volume	Units (U-100)
2 mg/mL	0.25 mL	25 units
2.5 mg/mL	0.2 mL	20 units
4 mg/mL	0.125 mL	12.5 units
5 mg/mL	0.1 mL	10 units
10 mg/mL	0.05 mL	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.

If your vial’s strength stays the same, 0.5 mg takes exactly twice the volume of 0.25 mg; compare with 0.25 mg of semaglutide in units. If a refill comes at a different mg/mL, every reading changes, so check the label on each new vial.

Where 0.5 mg sits on the labels

0.5 mg plays a different part on each label:

• Ozempic: “After 4 weeks on the 0.25 mg dosage, increase the dosage to 0.5 mg once weekly.” It can also be a maintenance dose: “The recommended maintenance dosage is 0.5 mg, 1 mg, or 2 mg, injected subcutaneously once weekly, based on glycemic control” (Ozempic label).
• Wegovy: 0.5 mg covers weeks 5 through 8 of Table 1, a “Dosage Escalation” step before 1 mg. The label adds: “If patients do not tolerate a dose during dosage escalation, consider delaying dosage escalation for 4 weeks” (Wegovy label).

The tablet label also names this injection dose: “Patients taking the 0.5 mg dose of OZEMPIC injection may switch to RYBELSUS tablets,” starting the tablets one week after the last injection (Rybelsus and Ozempic tablets label). Tablets are dosed in mg too, never in units.

These are label facts, not a plan for you. Follow your prescriber on your dose and on any switch.

How the branded products give 0.5 mg

• Ozempic pen (2 mg/3 mL, 0.68 mg/mL): holds “4 doses of 0.25 mg and 2 doses of 0.5 mg or 4 doses of 0.5 mg.” You “Turn the dose selector until the dose counter stops and shows your dose (0.25 mg or 0.5 mg).”
• Ozempic single-dose prefilled syringe: 0.5 mg per 0.5 mL.
• Wegovy single-dose pen or syringe: 0.5 mg/0.5 mL. The pen is “for 1 time use only.”

Ozempic’s pen is single-patient-use, and its label is blunt: “OZEMPIC pens must never be shared between patients, even if the needle is changed” (Ozempic label; Wegovy label).

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