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Use & how it works

Using Mounjaro: KwikPen, dosing & injecting

You use Mounjaro as a weekly subcutaneous injection. It comes as a pre-filled pen (including the KwikPen) and as a ready-to-use single-dose pen. You inject into the abdomen, thigh or upper arm and rotate the site; the dose is built up step by step from 2.5 to a maximum of 15 mg. Below is the practical guidance — always follow the patient leaflet and your doctor/pharmacy. This is general information, not dosing advice.

Using the KwikPen

The Mounjaro KwikPen is a multi-dose pen: each week you set the prescribed dose according to the patient leaflet. Your doctor or pharmacy will explain how to prepare the pen, set the dose and inject. There are also ready-to-use pens with a single fixed dose. Follow the instructions that belong to your pen.

How many doses are in it?

A Mounjaro KwikPen is designed for a fixed number of weekly doses (usually four). Do not try to get an 'extra' or fifth dose out of a pen: a leftover amount cannot be dosed reliably and that is unsafe. Use the pen as the patient leaflet prescribes and dispose of it afterwards.

Never dose with leftovers or self-'refilled' pens. Follow the patient leaflet; when in doubt, your pharmacy.

Where and how do you inject?

You inject Mounjaro just under the skin in the abdomen, thigh or upper arm, on a fixed day each week, each time at a different site. The general technique is at how injecting works.

Building up the dose (2.5 → 15 mg)

Mounjaro starts at 2.5 mg/week (an introductory dose) and is increased by 2.5 mg every ~4 weeks up to a maximum of 15 mg, to limit side effects. The doctor determines the build-up and the maintenance dose. See dosing & titration.

Storage and a missed dose

Store unused pens in the refrigerator (2–8 °C), not in the freezer; once in use, a limited storage period applies according to the patient leaflet. Missed a dose? Do not take a double dose; the patient leaflet describes what to do, so consult it or your pharmacy.

Frequently asked questions

How do I use the Mounjaro KwikPen?
The KwikPen is a pre-filled pen for a weekly subcutaneous injection. Your doctor or pharmacy will explain how to prepare it, set the dose and inject; rotate the injection site and follow the patient leaflet.
How many doses are in a Mounjaro KwikPen?
Usually four weekly doses. Do not try to get a fifth or 'leftover' dose out of the pen — that cannot be dosed reliably and is unsafe. Use the pen according to the patient leaflet.
Where do you inject Mounjaro?
Just under the skin in the abdomen, thigh or upper arm, weekly and each time at a different site. The doctor or pharmacy will explain the technique.
How quickly does Mounjaro work after the injection?
Appetite suppression can be noticeable in the first weeks, but visible weight loss comes gradually over months as the dose is built up. It varies from person to person.

Official sources on this topic

Independent, authoritative information from official bodies:

Read more

How do you inject a GLP-1 pen?→Dosing & titration schedule→About Mounjaro→Side effects of Mounjaro→