How to Inject Mounjaro With a Syringe: Video Guide (October 2026)

01 · The core answer

Do you inject Mounjaro with a syringe in the UK?

No. Mounjaro is a once-weekly prescription medicine that comes as a pre-filled multi-dose KwikPen in six strengths: 2.5mg, 5mg, 7.5mg, 10mg, 12.5mg and 15mg.¹ The dose is set on the pen and the needle is attached to the pen. A separate syringe is not needed.

Be cautious about any video or seller showing a vial of tirzepatide drawn into a syringe. Dose accuracy cannot be checked that way, and the contents of an unregulated vial cannot be verified. Genuine UK supply is dispensed after a consultation reviewed by a GPhC-registered prescriber.⁷

02 · What to do next

What to do next

If you already have a pen, watch the KwikPen video walkthrough and read the leaflet in the box.¹³ Needles, a sharps bin and injection guidance come with every order. If you are still deciding on treatment, see the Mounjaro pen prices and consultation page. Our weight loss clinic explains the wider service. A first 2.5mg pen costs £129.99 with code FIRST40 (standard price £169.99).

03 · Injecting with the pen

How the pen injection works

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. Rotate the site with each dose. Each KwikPen contains four weekly doses.¹

You set the dose by turning the dose knob until the indicator shows the correct dose in the window. You confirm the dose by the number in the window, never by counting clicks. 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.¹³ Follow the pen's instructions for attaching the needle and completing the injection.

04 · Where to inject

Choosing an injection site

Licensed injection sites are the stomach area (at least 5cm from the belly button), 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 We have separate guides for the stomach injection and the thigh injection. If you are unsure about technique, read about the injection angle. Questions about less common areas are covered in our guide to injecting in love handles.

05 · Dose, units and syringes

Units, millilitres and doses

The pen is dosed in milligrams, shown in the window, so syringe markings such as units do not translate to a Mounjaro dose. Do not try to convert between them. Liraglutide, a different daily medicine, has its own concentration of 6mg/ml, and its figures must never be applied to Mounjaro.

06 · Missed doses and storage

Missed doses and storage

If you miss a dose, take it as soon as you can within 4 days (96 hours) of the scheduled time, then carry on with your usual day. If more than 4 days have passed, skip the missed dose entirely and take the next one on your normal day. Never take two doses within 3 days of each other.¹

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 not above 30°C for up to 30 days, after which it should be discarded. Keep the pen cap on to protect it from light.¹³