How to Take Your GLP-1 Injection: What to Know Before You Start

Both Mounjaro and Wegovy are administered as once-weekly injections under the skin (subcutaneous injection), using a pre-filled pen device. Your prescriber or doctor will have explained the process specific to your medicine; always follow the patient information leaflet (PIL) that comes with your pen and any guidance your prescriber has given you.

Common injection sites

The most commonly used injection sites for these medicines are the abdomen (stomach area), the front of the thigh, and the upper arm. Rotating between sites each week is generally recommended to reduce the chance of skin reactions at any one spot. For specific guidance on technique and which sites are suitable for you, refer to your prescriber or the PIL included with your medicine.

What "oral liquid" GLP-1 products are — and are not

Searches for "GLP-1 oral liquid" or "GLP-1 drops" often lead to unlicensed supplements marketed using GLP-1 language, or to questions about herbal products such as lemon balm, glucomannan, or chia seeds that are sometimes promoted for weight management. These are entirely different from prescription tirzepatide or semaglutide and should not be treated as equivalent. If you are curious about any supplement in relation to your prescribed treatment, speak with your prescriber or doctor before taking it.

Handling and storing your pen

Pre-filled pens should generally be stored in a refrigerator, away from direct light and heat. Once removed from the fridge, check the leaflet that came with your pen — typically pens can be kept at room temperature for a defined period (often around a few weeks, but always verify with your specific leaflet or the electronic Medicines Compendium entry for your medicine). Never freeze the pen, and inspect the solution visually before use — if it appears cloudy, discoloured, or contains particles, do not use it and contact your pharmacy.

For a closer look at how Mounjaro is taken specifically, see our page on taking your Mounjaro pen step by step. If you are on Wegovy, our guide on taking your Wegovy injection covers what to expect. For a broader overview of GLP-1 injection guidance, visit how to take your GLP-1 medicine.

Staying on top of a weekly injection schedule is easier when you have a record of every dose. GLP Trackr's injection and dose logging feature lets you record each shot — the date, dose strength, and injection site — so you always know exactly where you are in your treatment.

The app also tracks your injection-site rotation history and suggests your next site automatically, removing the guesswork from rotation. If you ever find yourself unsure whether you took your injection this week, a quick check of your log gives you a clear answer — useful to have, and important to share with your prescriber rather than acting on instinct alone.

Dose reminders can be set so your weekly injection day is never forgotten, helping you build the consistency that matters most on a GLP-1 journey. You can also use the how Mounjaro works guide to understand more about the mechanism behind your treatment.

Important: any decision about your dose — including what to do if you miss an injection — belongs with your prescriber or doctor, not with an app. GLP Trackr helps you record and track; it is not a substitute for clinical guidance. If you experience severe or persistent symptoms, contact your healthcare professional promptly.

Ready to take control of your injection schedule? Log your shots, track your sites, and let reminders do the rest — GLP Trackr is free to try for 7 days on the App Store and Google Play.