Published August 1, 2026 · Educational, not medical advice
Most GLP-1 medications are given as a small subcutaneous (just under the skin) injection you can do at home. This is a plain-English overview of the general steps for a pen and for a vial-and-syringe, plus where to inject and how to keep it clean. It is educational, not medical advice — the product’s own instructions and your prescriber’s guidance always come first, and hands-on training from a professional is worth more than any web page.
Before you start
Wash your hands and gather supplies: your pen or vial, an alcohol swab, and (for a vial) a clean insulin syringe and a sharps container.
Check the product and let it reach room temperature if its instructions say so; confirm your dose.
Confirm the solution looks clear (not cloudy or full of particles).
Where to inject
Common subcutaneous sites are the abdomen (avoiding roughly two inches around the navel), the front of the thigh, and the back of the upper arm. Rotate sites so you don’t use the same spot repeatedly — see site rotation.
Pen
Attach a new needle if your pen uses them; prime / do the air-shot if the instructions call for it.
Wipe the site, pinch the skin if directed, insert at the angle the pen specifies, press and hold for the full count in the instructions, then remove.
Dispose of the needle in a sharps container — never recap or reuse.
Vial and syringe
Work out the units to draw first with the free calculator or the units charts — units depend on your vial’s concentration.
Wipe the stopper, draw the units, and tap out air bubbles (see reading a syringe).
Wipe the site, pinch the skin, insert at a shallow subcutaneous angle, inject, and dispose of the syringe in a sharps container.
Common mistakes
Skipping site rotation (can cause lumps over time).
Reusing or recapping needles.
Confusing mg and units, or U-40 and U-100 syringes — a 10× error.
Get hands-on training from your pharmacist or clinician before your first at-home injection. The product’s instructions for use are the authority; this page is general education, not medical advice.
Track it in the free app
Log doses, symptoms, weight and reminders on your device — no account, nothing uploaded.
Common subcutaneous sites are the abdomen (away from the navel), the front of the thigh, and the back of the upper arm. Rotate spots each time.
Do I pinch the skin, and at what angle?
Many people pinch a fold of skin and inject at the angle the pen or product instructions specify (often shallow, subcutaneous). Follow your product’s instructions and your training.
How do I dispose of needles safely?
Put them straight into a sharps container — never recap or reuse a needle, and don’t throw loose needles in the trash.
Does site rotation matter?
Yes — rotating sites helps avoid lumps and supports steadier absorption. Use a simple rotation and track it.
Pen vs syringe — what’s different?
A pen is pre-dosed (you dial a dose). With a vial you draw the units yourself, so you must confirm the concentration and the units first. The site and clean technique are the same.
Subcutaneous self-injection technique and site guidance from manufacturer instructions for use (semaglutide, tirzepatide).
General sharps-disposal and clean-technique guidance; get hands-on training from your pharmacist or clinician.
Pepathary is a personal organizational and educational tool. It is not a medical device, does not diagnose, treat, cure, or prevent any condition, and does not recommend medications or doses. Figures here summarize widely-reported information and general guidance; always confirm what is right for you with your physician or pharmacist.