THE SHORT VERSION
- Use the areas and method in your product instructions.
- Change the exact spot and ask for help with difficult areas.
Choose an area you can use reliably
Instructions describe injection under the skin in areas such as the abdomen, thigh or upper arm. Ask a pharmacist or nurse to show the method for your exact pen and watch you practise if needed. An upper-arm injection may require help.
Rotate the exact spot as directed. Ask which skin changes mean an area should be avoided. If you inject insulin too, confirm how to keep sites separate. Do not assume changing body area increases the medicine's effect.
Resolve uncertainty before another injection
If the device leaks, a needle seems blocked or you are unsure whether treatment was delivered, check the instructions or contact the pharmacist. Do not immediately repeat the injection to compensate.
Note what happened and the pen details. Use needles and dispose of sharps as instructed; never share a pen. Ask about persistent redness, swelling or pain. Breathing difficulty, tongue or throat swelling, or collapse after an injection needs emergency help.
Sources you can check
- Mounjaro KwikPen: current UK patient leaflet
- Wegovy FlexTouch: current UK patient leaflet
- NHS: tirzepatide
- NHS: semaglutide
Editorial presentation updated 24 October 2026. This is general information, not individual medical advice or a claim of independent clinical review. Read the linked source and the leaflet supplied with your medicine for the full context. Suggest a correction.