How to inject the tirzepatide pen: a step-by-step video guide

The decision most people agonise over: where to inject

A lot of first-time users spend more time worrying about the injection site than the injection itself. That's understandable, it feels significant. The good news is that the tirzepatide KwikPen is approved for three sites, and all three work. The abdomen (at least a couple of centimetres away from your navel), the outer thigh, and the upper arm are all acceptable. What matters more than which site you pick is that you rotate. Injecting the same spot week after week can cause the fatty tissue to harden, which affects how the medicine is absorbed.

If you're unsure which site suits your body best, the thigh injection technique guide covers that position in detail, including how to position your leg for a relaxed injection. Many people find the thigh easiest for self-injection because you can see exactly what you're doing. Others prefer the abdomen for the same reason. The upper arm is an option, though it typically needs a second person to reach comfortably.

One practical note: avoid areas where the skin is broken, bruised, or has a rash. Check the NHS tirzepatide medicines page for a clear summary of injection-site guidance alongside the medicine's other key facts.

The injection itself: what a good technique actually involves

Before anything else, wash your hands. Then gather what you need: your pen, a fresh needle, an alcohol swab to clean the site, and a sharps container for disposal afterwards. Medical-grade alcohol swabs are inexpensive and worth keeping alongside your pens, clean the skin and let it dry fully before injecting, as residual moisture can sting.

Attach a new needle to the pen by peeling off the foil, screwing it on straight, and removing both caps. For a full walkthrough of every step in the process, our guide to injecting tirzepatide covers preparation, technique, and aftercare in one place. The pen is a push-button design: hold it against the skin at a 90-degree angle, press the button until you hear a click, and hold it in place for ten seconds before withdrawing. That ten-second hold is the step most commonly skipped, and skipping it can mean a small amount of the dose is lost.

After the injection, remove the needle carefully and place it straight into a sharps container, needles must not go into household bins. Recap the pen and return it to the fridge. Dispose of the needle immediately; never reuse it, and never leave a needle attached between doses, as this can cause the pen mechanism to block.

Reading the pen window and knowing when a dose is complete

The KwikPen has a dose window that shows how many doses remain. Before each injection, check it. A full pen shows four doses; an empty pen shows a zero or lock symbol depending on the pen generation. If the window shows a number but the button doesn't depress fully or no click occurs, do not force it. Contact your prescriber or the nume support team, who are available seven days a week.

A common misconception worth gently addressing: some people assume that a partially depressed button means they received a partial dose. In practice, the KwikPen is designed to deliver the full dose in one movement, if the button clicked and you held it for the full ten seconds, the dose was almost certainly complete. If you genuinely cannot tell, the right call is to speak to your prescriber rather than re-injecting. The frequently asked questions page covers this and similar pen-use questions.

For a broader look at the full injection process from preparation to aftercare, if you find video demonstrations easier to follow than written instructions, the Mounjaro pen injection video walks through the same pen in a format many people find clearer.

After the injection: what's normal, what to watch for

A small amount of redness or a tiny bruise at the injection site is common and nothing to worry about. Some people notice mild stinging for a minute or two, especially if the pen was used straight from the fridge rather than being allowed to warm up a little. Letting the pen sit at room temperature for around twenty to thirty minutes before injecting can help with this, though again, check your Patient Information Leaflet for the specific time window allowed, since this varies and should not be exceeded.

Tirzepatide's most commonly reported side effects are gastrointestinal: nausea, loose stools, or indigestion, typically most noticeable in the first week or two at a new dose level. These tend to settle. If you would like to see the process demonstrated step by step, our video guide to injecting tirzepatide is a helpful resource to watch before your first dose, and our video showing how to inject Mounjaro covers the same technique from a slightly different angle that some people find easier to follow. The Mounjaro injection page has more on what to expect in the days following each dose. If you experience severe or persistent stomach pain that spreads towards your back, seek prompt medical attention, the MHRA's guidance flags this as a symptom requiring urgent assessment.

Thinking about whether tirzepatide is the right option for you? The weight-loss treatment overview sets out how different medicines compare. When you're ready, speak to our prescribers through a free consultation, a real clinician reads every submission the same day.