How to Draw Up 2.5mg of Tirzepatide (Mounjaro) in October 2026

01 · The core answer

How to set 2.5mg on a KwikPen

You set 2.5mg by turning the dose knob until the dose indicator shows 2.5mg in the window. You confirm the dose by the number in the window, never by counting clicks.¹

Always follow the instructions in the leaflet that comes with your pen, including how to attach the needle and how to inject.¹³ Needles, a sharps bin and injection guidance are included with every order.

02 · Your next step

If you were expecting a vial

If you were sent a vial and a syringe, that is not the licensed KwikPen. Check with the supplier and with a prescriber before using it.

Genuine pens are supplied through a consultation reviewed by a GPhC-registered prescriber. You can see the Mounjaro pen prices and consultation; the 2.5mg starter pen is £169.99 at the standard price. Prices checked 10 October 2026.

Related guides: How to draw up mounjaro and How to measure 2.5 mg of tirzepatide and Mounjaro 2.5 mg and Is 2.5 mg mounjaro enough and Is 2.5 mg mounjaro safe.

03 · Using the pen dial

Using the pen dial correctly

Each pen contains four weekly doses; the pen will not let you dial past the medicine left inside. If the window will not turn to a full dose, the pen does not contain enough for one and should not be used for a partial injection.¹

That means you never need to measure, split or top up a dose yourself. The pen is designed to deliver the licensed dose and nothing else.

04 · Where and when

Injection site and timing

Mounjaro is injected under the skin (subcutaneously) once a week, on the same day each week, at any time of day, with or without food. Licensed sites are the stomach area, the front of the thigh, or the back of the upper arm if someone else gives the injection. Rotate the site with each dose.¹

Everyone starts on 2.5mg. This starting dose is about letting your body adjust, not about weight loss itself.¹

05 · Why not alter doses

Why you should not alter the dose

Taking smaller or more spread-out doses than the pen is designed to deliver is not licensed, not supported by the pen's design and not endorsed by any UK regulator. Altering doses outside the licence means unknown dosing accuracy and no safety data.¹

If side effects worry you, your prescriber can hold a dose longer or step down within the licence.

06 · Storing your pen

Storing the pen

Keep Mounjaro pens in a fridge at 2–8°C and never freeze them. Once in use, a pen can be kept out of the fridge at a temperature not above 30°C for up to 30 days after first use, and must then be thrown away. Do not use a pen that has been above 30°C or has been frozen. Keep the pen cap on to protect it from light.¹