Injection Sites and Why Rotation Matters
Semaglutide (Wegovy) is a subcutaneous injection — meaning it goes into the fatty tissue just under the skin. According to the electronic Medicines Compendium (eMC), the three recommended areas are the abdomen, the thigh, and the upper arm. Each week you move to a different site, and within each site you also vary the exact spot to avoid injecting the same patch of skin repeatedly.
Why rotate?
Injecting the same spot too often can cause a localised skin reaction — thickening, hardness, or discomfort under the skin. Regular rotation keeps each area in good condition and may also support consistent absorption. Your prescriber or doctor, or the patient information leaflet that came with your pen, will give you specific guidance tailored to you.
A few things most people find useful
- Abdomen: avoid the area directly around the navel (usually a few centimetres in each direction).
- Thigh: the outer, front-facing part of the thigh is the standard area.
- Upper arm: the outer part of the upper arm — often easier if someone else is helping.
- Temperature: check the leaflet that came with your pen for storage and pre-injection guidance; generally, injecting a pen that has been left at room temperature for a short period is more comfortable than injecting straight from the fridge.
If you are newer to the injection routine, you may also find it useful to read about finding local support for weight loss injections, or to explore what slimming injection programmes typically involve — both cover helpful background for people at the start of their journey. For a broader overview of how injectable weight loss medicines work, the weight loss injections guide is a good starting point.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
Tracking the right four numbers — weight, waist, protein and dose — turns a noisy chart into a clear story. That's the loop GLP-1 users keep coming back for.
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How GLP Trackr Helps You Stay on Top of Your Injection Routine
Keeping track of which site you used last week sounds simple — until a few months in, when the weeks blur together. GLP Trackr's injection-site tracking logs every injection you record (abdomen, thigh, or arm) and suggests your next rotation automatically, so you never have to guess or try to remember.
Beyond site rotation, the app also logs each dose date and strength, which is useful if you ever need to check when your last injection was or want a clear record to bring to a prescriber appointment. Dose reminders can be set so a weekly injection does not quietly slip past a busy day.
If you experience any injection-site reactions — redness, itching, or localised discomfort — the side-effect log lets you note them with a date, making it easier to spot patterns and discuss them with your healthcare professional. You can also explore what to consider around the cost and access side of injectable treatments if that is on your mind.
GLP Trackr is available free on the App Store and Google Play, with a 7-day trial to get started — log your first injection, set a rotation reminder, and let the app handle the tracking from there.
Any concerns about your injection technique, site reactions, or how to handle your pen should be directed to your prescriber or doctor — they know your full history and can advise properly. If a reaction is severe or persistent, contact a healthcare professional promptly rather than waiting.
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Frequently asked questions.
Semaglutide (Wegovy) is injected subcutaneously into the abdomen, front of the thigh, or outer upper arm. You rotate between these areas each week. Your prescriber or doctor and the patient information leaflet with your pen will give you personalised guidance on technique.
Yes, rotating injection sites each week is recommended. Repeatedly using the same spot can cause skin thickening or discomfort and may affect how the medicine is absorbed. Moving between the abdomen, thigh, and upper arm helps keep each area in good condition.
Mild redness, itching, or discomfort at the injection site is commonly reported with semaglutide. It usually settles on its own. If a reaction is severe, spreads, or persists, contact your healthcare professional promptly rather than managing it alone.
GLP Trackr logs each injection site you record and automatically suggests your next rotation. It also tracks dose dates and strengths, and lets you set weekly reminders so you never miss a scheduled injection.
GLP Trackr is a tracking app for people already prescribed semaglutide — it does not sell, supply, or help you locate the medication. For access to the medicine, speak with your prescriber or doctor and a registered pharmacy in your country.