Guides / Mixing and syringes
How many doses are in a GLP-1 pen or a peptide vial?
For a branded pen or vial, the label tells you, and it's usually 1 or 4. For a peptide vial, divide what's in the vial by the dose, and round down.
[00] Short answer
- Mounjaro and Zepbound: a KwikPen or multi-dose vial holds 4 weekly doses. Single-dose pens and vials hold 13–4.
- Ozempic (US): the 1 mg and 2 mg pens give 4 doses. The 0.25/0.5 mg pen gives 4 doses of 0.25 mg and 2 of 0.5 mg, or 4 doses of 0.5 mg1.
- Wegovy (US): single-dose pens hold 1 dose, in cartons of 4. The Wegovy FlexTouch holds 4 doses of 2.4 mg2.
- Peptide vials: doses = vial mg ÷ dose. A 10 mg vial at 250 mcg holds 40 doses, however much water you add.
How many doses are in Ozempic, Wegovy, Mounjaro and Zepbound pens and vials?
Most multi-dose GLP-1 pens and vials in the US hold 4 weekly doses, which is about a month. Single-dose pens, syringes and vials hold one. The table is copied from each US prescribing information.
| Pen or vial | Doses | Throw away |
|---|---|---|
| Ozempic pen, 0.25 mg or 0.5 mg (2 mg/3 mL) | 4 doses of 0.25 mg and 2 doses of 0.5 mg, or 4 doses of 0.5 mg1 | 56 days after first use1 |
| Ozempic pen, 1 mg (4 mg/3 mL) | 4 doses of 1 mg1 | 56 days after first use1 |
| Ozempic pen, 2 mg (8 mg/3 mL) | 4 doses of 2 mg1 | 56 days after first use1 |
| Ozempic single-dose prefilled syringe | 1 dose. Cartons of 41 | After the one dose |
| Wegovy single-dose pen (0.25 to 2.4 mg) or Wegovy HD (7.2 mg) | 1 dose. Cartons of 4 pens2 | After the one dose2 |
| Wegovy FlexTouch (9.6 mg/3 mL) | 4 doses of 2.4 mg2 | After 4 doses, or 56 days after first use2 |
| Mounjaro or Zepbound single-dose pen | 1 dose. Cartons of 4 pens3–4 | After the one dose3–4 |
| Mounjaro or Zepbound single-dose vial | 1 dose of 0.5 mL3–4 | After the one dose, even if liquid is left4 |
| Mounjaro or Zepbound multi-dose vial | 4 doses of 0.6 mL3–4 | After 4 doses, 30 days after first use, or 30 days at room temperature3–4 |
| Mounjaro or Zepbound KwikPen | 4 doses of 0.6 mL3–4 | After 4 doses, 30 days after first use, or 30 days at room temperature3–4 |
Each weekly dose is one pen or vial for the single-dose presentations, so a carton of 4 pens is 4 weeks. The dose steps themselves are in our semaglutide dosage chart and tirzepatide dosage chart.
Why is there liquid left after the last dose?
Multi-dose pens are filled with a little extra, and the labels say to throw the pen away after its last dose even if some is left. The Wegovy FlexTouch instructions say there may still be medicine in the pen after all four doses, and to dispose of it2. The Zepbound KwikPen won't let you dial a full dose after 4 doses, and its instructions say not to inject the leftover4.
On an Ozempic pen, if the counter stops before your dose, there isn't enough left for a full dose, and the label says to use a new pen1. The Mounjaro version of this question is covered in our Mounjaro "golden dose" guide.
How many doses are in UK Mounjaro, Ozempic and Wegovy pens?
Every UK Mounjaro KwikPen holds 4 doses of 0.6 mL5. UK Ozempic pens and every strength of UK Wegovy FlexTouch also hold 4 doses6–7. The UK 0.25 mg Ozempic pen differs from the US one: it gives 4 doses of 0.25 mg6.
| Pen | Doses |
|---|---|
| Mounjaro KwikPen (2.5 to 15 mg) | 4 doses of 0.6 mL, every strength5 |
| Ozempic 0.25 mg pen | 4 doses of 0.25 mg6 |
| Ozempic 0.5 mg pen (1.5 mL or 3 mL) | 4 doses of 0.5 mg6 |
| Ozempic 1 mg pen | 4 doses of 1 mg. One 3 mL pack holds 8 doses of 1 mg6 |
| Ozempic 2 mg pen | 4 doses of 2 mg6 |
| Wegovy FlexTouch (0.25, 0.5, 1, 1.7 or 2.4 mg) | 4 doses, every strength7 |
Not every pack size is sold6.
More on the UK Mounjaro pen, and why clicks aren't a dose, is in Mounjaro pen doses in the UK.
How many doses are in a peptide vial?
Divide the amount of peptide in the vial by your dose, in the same unit, and round down. A 10 mg vial is 10,000 mcg, so at 250 mcg a dose it holds 40 doses. A 5 mg vial at 300 mcg holds 16 full doses with 200 mcg left over, which isn't a full dose. If your dose and vial use different units, see mcg to mg first.
| Vial | 100 mcg | 250 mcg | 500 mcg | 1,000 mcg |
|---|---|---|---|---|
| 2 mg vial | 20 | 8 | 4 | 2 |
| 5 mg vial | 50 | 20 | 10 | 5 |
| 10 mg vial | 100 | 40 | 20 | 10 |
| 15 mg vial | 150 | 60 | 30 | 15 |
This is the most the math allows. It assumes every drop can be drawn out of the vial.
Does adding more water give you more doses?
No. The water changes how many units each dose takes on the syringe, not how many doses the vial holds. A 5 mg vial at 250 mcg gives the same number of doses with 1, 2 or 3 mL of water.
| Water added | Units per dose | Doses in the vial |
|---|---|---|
| 1 mL water | 5 units | 20 |
| 2 mL water | 10 units | 20 |
| 3 mL water | 15 units | 20 |
Time can run out before the doses do. The CDC says an opened multi-dose vial should be dated and thrown away within 28 days, unless the maker gives another date8. Our 28-day rule guide explains where that number comes from, and how much bac water to add covers choosing the water.
[Tool]Doses per vial for your own numbersThe calculator shows doses per vial and units per doseQuestions
How many doses are in a Mounjaro KwikPen?
4 weekly doses of 0.6 mL, in the US and the UK. Throw it away after 4 doses or 30 days after first use, whichever comes first.
How many doses are in an Ozempic pen?
In the US, the 1 mg and 2 mg pens hold 4 doses. The 0.25/0.5 mg pen holds 4 doses of 0.25 mg and 2 doses of 0.5 mg, or 4 doses of 0.5 mg. UK Ozempic pens hold 4 doses.
How many doses are in a Wegovy pen?
A US Wegovy single-dose pen holds one dose, and a carton has 4 pens. The US Wegovy FlexTouch holds 4 doses of 2.4 mg. UK Wegovy FlexTouch pens hold 4 doses at every strength.
How many doses are in a Zepbound vial?
A single-dose vial holds one 0.5 mL dose. A multi-dose vial holds 4 doses of 0.6 mL and is thrown away after 4 doses, 30 days after first use, or 30 days at room temperature.
How many 250 mcg doses are in a 5 mg vial?
20. 5 mg is 5,000 mcg, and 5,000 divided by 250 is 20. The amount of water doesn't change that.
Can I use the leftover liquid as an extra dose?
The labels say no. The Zepbound KwikPen instructions say not to inject the leftover medicine, and the Wegovy FlexTouch instructions say to dispose of the pen after 4 doses even if medicine is left.
Sources
Checked against US prescribing information for Ozempic, Wegovy, Mounjaro and Zepbound (2026), UK SmPCs for Mounjaro KwikPen, Ozempic and Wegovy FlexTouch (2026), CDC injection safety guidance and the PeptideTracker dose math. How we check
- 1Ozempic (semaglutide) injection: US prescribing information and Instructions for Use, Novo Nordisk. sections 3 and 16, revised 05/2026; IFU June 2026
- 2Wegovy (semaglutide) injection: US prescribing information and Instructions for Use, Novo Nordisk. sections 3 and 16, revised 06/2026; FlexTouch IFU 06/2026
- 3Mounjaro (tirzepatide) injection: US prescribing information (DailyMed). Eli Lilly, sections 3 and 16; revised 08/2026
- 4Zepbound (tirzepatide) injection: US prescribing information and Instructions for Use (DailyMed). Eli Lilly, sections 3 and 16; revised 08/2026
- 5Mounjaro KwikPen solution for injection in pre-filled pen: UK SmPC (eMC). sections 2 and 6.6; revised 29 Aug 2026
- 6Ozempic solution for injection in pre-filled pen: UK SmPC (eMC). section 6.5; revised 07/2026
- 7Wegovy FlexTouch solution for injection in pre-filled pen: UK SmPC (eMC). sections 6.5 and 6.6; revised 09/2026
- 8CDC, Preventing Unsafe Injection Practices. multi-dose vials; page dated 26 Mar 2024
This guide explains what labels and published studies say. It isn't medical advice and doesn't replace your prescriber or pharmacist.
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Read next
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- How to use a GLP-1 pen: flow check, hold time and what to do if no drop appearsMulti-dose pens need a test squirt and a new needle each time. Single-dose pens don't, but you have to hold them on the skin long enough. Each pen's instructions set the numbers.
- How to draw a dose from a vial with an insulin syringeThe Zepbound and Mounjaro vial instructions, MedlinePlus and the CDC all describe the same short routine. The two habits that matter most are a new needle every time and checking for air.