Where to Inject Ozempic, Wegovy, Mounjaro and Zepbound

Inject Ozempic (semaglutide) under the skin of your abdomen, thigh or upper arm; all three give similar exposure (Ozempic label, section 12.3). Keep abdominal shots at least 2 inches (5 cm) from the belly button (Ozempic syringe instructions). Mounjaro and Zepbound keep the back of the upper arm for another person to inject (Mounjaro label, section 2.2).

Key facts

• Skip any patch that is tender, bruised, red or hard, plus scars and stretch marks (Wegovy pen instructions).
• The Ozempic pen comes with 32G 4 mm needles, and FITTER, written for insulin, makes 4 mm pen needles the first choice for everyone (Ozempic Instructions for Use; FITTER).
• Mounjaro and Zepbound pens need no warming after the fridge, but never heat an Ozempic prefilled syringe in hot water or a microwave (Zepbound and Ozempic instructions).
• Ozempic and insulin may share a body region, though never side by side (Ozempic label, section 2.1).

Injection sites by medicine and device

Every device allows the abdomen and the thigh, so the upper arm is where they differ. The table follows the Instructions for Use for Ozempic, Wegovy, Mounjaro and Zepbound in the US, and the UK Mounjaro KwikPen user manual and Wegovy FlexTouch leaflet.

To plan the order, enter the sites you used last in the GLP‑1 injection site rotation chart and get 8 weeks of belly and thigh zones in turn.

Where exactly on the abdomen and thigh

On the abdomen, stay at least 2 inches (5 cm) from your belly button (Wegovy pen, Ozempic syringe and KwikPen instructions). On the thigh, use the front. The Wegovy pen instructions describe the two areas as the "lower stomach" and the "upper leg (front of the thighs)".

Can I inject Mounjaro in my arm?

Only if someone else gives the injection. The US Mounjaro label says to inject "in the abdomen, thigh, or have another person inject MOUNJARO in the back of the upper arm" (Mounjaro prescribing information, section 2.2). UK readers get the same rule from the Summary of Product Characteristics (SmPC), the UK prescribing document, and from the KwikPen user manual (Mounjaro SmPC, section 4.2; KwikPen user manual).

If you inject yourself on tirzepatide, rotate between your abdomen and both thighs.

Does the site change absorption, weight loss or nausea?

The site makes little difference to how much drug you absorb. The Ozempic and Wegovy labels report similar semaglutide levels from the abdomen, thigh and upper arm, and the Zepbound label says the same of tirzepatide (Wegovy, section 12.3; Zepbound, section 12.3). With similar amounts reaching your blood from each site, there is no reason to expect one to act more strongly on appetite or weight.

We found no study that compares nausea by injection site, and the labels do not raise it. The Ozempic label ties nausea to the dose instead, placing the majority of its trial reports of nausea, vomiting and diarrhea in the weeks of dose escalation (Ozempic prescribing information, section 6.1). If nausea is the worry, plan around the weeks after a step up, when stomach side effects after a new dose are likeliest to show. Moving the shot to another hour changes little, because the hour barely moves the weekly semaglutide level.

Skin to avoid and injection technique

Skin to avoid

Skip skin that is "tender, bruised, red, or hard", and avoid scars and stretch marks (Wegovy Instructions for Use). For Mounjaro and Zepbound, add skin with pits, thickening or lumps (Zepbound Instructions for Use). Clean the site with an alcohol swab or soap and water first, and allow it to dry. Rest a bruised or lumpy spot until it settles, and call about skin that turns hot and swollen or a lump that keeps returning.

Needles and pinching

These shots go under the skin, into the fat, and never into a muscle or a vein (Ozempic and Wegovy Medication Guides). With the Ozempic prefilled syringe, pinch a fold of skin and put the needle in at 45 degrees (Ozempic Instructions for Use). With a Mounjaro or Zepbound vial, ask your healthcare provider whether to pinch, as the vial instructions direct (Zepbound Instructions for Use).

The Ozempic pen comes with NovoFine Plus 32G 4 mm needles, and other compatible needles up to 8 mm long can be used (Ozempic Instructions for Use). The FITTER insulin recommendations call the shortest needles, currently 4 mm on a pen, the first-line choice in all patient categories (Frid et al., New Insulin Delivery Recommendations, 2016). Mounjaro KwikPen needles are not in the pack (Mounjaro KwikPen user manual), so ask your pharmacist which one to use.

Cold pens

A Mounjaro or Zepbound pen can go straight from the fridge to your skin; its instructions say it is not necessary to warm it to room temperature (Zepbound Instructions for Use). Do not warm an Ozempic prefilled syringe with any heat source (Ozempic Instructions for Use).

Injecting insulin or a split Wegovy 7.2 mg dose

If you also inject insulin, give Ozempic as a separate shot; the same body region is fine as long as the two are not next to each other (Ozempic prescribing information, section 2.1). For Mounjaro, the UK SmPC asks for a different injection site from the insulin (section 4.2).

In the UK, a 7.2 mg Wegovy dose can be given as three 2.4 mg injections one after another, in the same body area but at least 5 cm apart (Wegovy SmPC, section 4.2).

Rotating between sites

Move the spot every week. The Wegovy pen instructions let you use the same body area each week, "but make sure it is not in the same spot each time" (Wegovy Instructions for Use). Keep a log of each week’s site and check it before each shot.