Mounjaro Injection Site Pictures: What to Look For and Where to Inject

What the Mounjaro SmPC and patient leaflet tell us about injection sites

The Mounjaro Summary of Product Characteristics, published on the eMC, specifies subcutaneous injection into three areas: the periumbilical abdomen (avoiding the two-inch zone directly around the navel), the anterolateral thigh, and the outer upper arm. These locations share one thing, enough subcutaneous fat to allow the medicine to absorb steadily rather than entering muscle, where it is not intended to go.

The licensed guidance also states that the same site should not be used for two consecutive weekly doses. Rotating not just between areas but within them (moving a few centimetres each time) distributes the small tissue response that any subcutaneous injection can cause. This is standard practice across GLP-1 medicines, not unique to Mounjaro.

Each Mounjaro KwikPen delivers four weekly doses; knowing which site you used last matters. A simple approach many patients use: a small note on the pen cap or a note in a phone app. The pen lives in the fridge door between doses, which makes a routine easy to anchor, take it out at a consistent moment, let it reach room temperature as instructed in the leaflet, then inject. For more on the broader injection process, the Mounjaro injection guide covers the full step-by-step.

What each injection site looks like in practice, and how to find it

Pictures circulating online vary in quality. What official sources and clinical practice describe is a consistent set of anatomical landmarks, knowing these lets you judge any image accurately.

Abdomen. The preferred zone is two to three inches either side of the navel, below the waistband of most clothing. The skin here typically has enough subcutaneous fat to pinch into a fold of at least two centimetres. Avoid any area with visible stretch marks or scar tissue where possible, as absorption may be altered. For a detailed photo guide to the abdominal zone specifically, this visual walkthrough maps the landmarks clearly.

Thigh. The front-outer surface of the thigh (roughly the middle third of the upper leg) is the recommended area. The inner thigh and the back of the leg are not licensed sites. Seated injection into the thigh is easier for many people than standing, as the muscle beneath relaxes. Our dedicated thigh injection site page includes guidance on posture and skin-pinch technique for this location.

Upper arm. The outer, fleshy part of the upper arm (often called the deltoid area) is the third option. Self-injection here is harder without practice; some people find bracing the arm against a wall or surface helps stabilise the site. If you are using the arm regularly, see the upper arm injection site guide for positioning detail.

What normal skin looks like after injection, and what to watch for

After a subcutaneous injection, a small raised wheal, mild redness, or a faint bruise at the puncture point is entirely normal. These reactions typically settle within a day or two and do not indicate a problem with the medicine or the technique.

What is less typical, and worth noting: persistent redness that spreads beyond a few centimetres, a site that remains hard, swollen or warm for more than a few days, or a nodule that does not resolve over a week or two. These can indicate lipohypertrophy (a localised fat-tissue thickening associated with repeated injection into the same spot) or in rare cases a skin infection. Both are reasons to contact your prescriber rather than wait.

The NHS patient page for tirzepatide lists injection-site reactions among the common side effects of Mounjaro, categorising them as usually mild. If you notice something that does not match the description above, the guide to red or inflamed injection sites explains the distinction between expected reactions and those that need clinical attention. Any suspected side effect can also be reported via the MHRA Yellow Card scheme, that reporting channel is open to patients as well as healthcare professionals.

Choosing the right site for your situation

There is no single best site, the right choice depends on body composition, comfort, and what is practicable week to week. Abdomen is the most commonly used in clinical practice, partly because it is easy to see and reach. Thigh works well for people who find abdominal pinching uncomfortable. The arm is genuinely useful when travelling or in situations where exposing the abdomen is inconvenient.

What matters more than which site you choose is that you alternate consistently and keep the technique clean: fresh needle each time, skin cleaned beforehand, injection angle as described in your patient leaflet, needle left in place for the count stated. Fresh needles reduce injection-site trauma and are worth keeping in stock, replacement needles are available directly from our pharmacy if you need to reorder.

If you are unsure whether your injection technique is correct, or if you are moving between sites and want to confirm your approach before your next dose, that question belongs in a conversation with your prescriber rather than a forum. The overview of all places to inject Mounjaro covers the full range of considerations in one place. If you are thinking about starting treatment and want a clinical assessment, speak to our prescribers, there is no cost to the initial consultation.