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GLP-1 pen supply calculator
Pick the pen and its first dose date to lay out all four weekly doses, the date dose five needs a new pen or box, and the official in-use storage limit.
The useful bit
What the answer means
A Mounjaro KwikPen, Wegovy FlexTouch up to 2.4mg and Zepbound KwikPen each contain four weekly doses. US single-dose Zepbound pens come four to a box. The fifth weekly dose therefore needs a new pen or box.
The storage note comes from the selected product’s leaflet or label. It is shown beside the dates because ‘four doses’ and ‘how long an opened pen keeps’ are related but not identical rules.
Transparent by design
How it works
- 1
Choose the exact pen
The pack and storage wording change by product.
- 2
Pick dose one
The calculator adds seven days for each weekly dose.
- 3
Plan the refill
Dose five is highlighted as the day a new pen or box is needed.
first dose date + 7, 14 and 21 days; new pen or box at 28 daysPlain answers
Questions people ask
How many doses are in a Mounjaro KwikPen?
Four weekly doses. The fifth weekly dose needs a new pen.
How many doses are in a Wegovy FlexTouch pen?
The UK FlexTouch pens up to 2.4mg contain four doses. Wegovy 7.2mg is different because one dose uses three 2.4mg injections.
Does the calculator replace the date on my dispensing label?
No. It only counts weekly dates and repeats the selected product’s official storage limit. Follow your pharmacy label and prescriber’s instructions.
Are the dates saved?
No. They stay in your browser unless you choose to copy a result link containing them.
Method and sources
- Mounjaro KwikPen patient leaflet
- Wegovy FlexTouch patient leaflet
- Zepbound prescribing information
- Ozempic patient leaflet
Checked 19 October 2026. General information, not medical advice. Follow your prescriber and dispensing label.