How to Inject Tirzepatide: A Step-by-Step Guide for Compounded Vials

The FDA-approved tirzepatide vial, sold as Zepbound, comes with step-by-step Instructions for Use, and the MedlinePlus tirzepatide injection information covers sites, timing and disposal. The steps below follow both. Compounded vials differ in one important way: concentration can vary from one pharmacy to the next, so your units come from your own prescription, never from the brand instructions.

Give yourself unhurried time for the first few doses while you learn how to inject tirzepatide at home.

1. 01

   Step 1: Wash your hands & set up supplies

   Wash with soap and water and dry your hands fully. Lay out everything from the list above on a clean, bright surface.

   A new syringe and needle every time helps prevent infection and blocked needles.

2. 02

   Step 2: Check the vial & your dose in units

   Read the label for your name, the medicine, the mg/mL concentration and the expiry date. The liquid should be clear and colorless to slightly yellow, with no cloudiness or particles. Then confirm your units. A U-100 syringe measures volume, and units to draw = (your dose in mg / the vial's mg/mL) x 100. Harbor's guide on how to measure tirzepatide in units works through the math. If your result and your clinician's number differ, stop and ask.

   The FDA has warned about dosing errors with compounded GLP-1 vials when milligrams, milliliters and units get mixed up.

3. 03

   Step 3: Draw tirzepatide into the syringe

   Here is how to draw tirzepatide from vial to syringe without fighting a vacuum. Wipe the rubber stopper with an alcohol swab. Pull the plunger back to draw in air to your unit line, push the needle through the stopper and press the air into the vial. Turn the vial and syringe upside down, keep the needle tip in the liquid, and pull slowly past your line. Tap the bubbles up, push the plunger to exactly your line, and withdraw the needle.

4. 04

   Step 4: Choose & clean the injection site

   Pick your stomach, thigh or, with help, the back of your upper arm, away from last week's spot. Wipe it with an alcohol swab and let it dry. Skip skin that is tender, bruised, hard, scarred or lumpy.

5. 05

   Step 5: Inject under the skin

   Inject the way your clinician showed you, including whether to pinch. Insert the needle, push the plunger down fully, and keep the needle in for at least 5 seconds, as the Zepbound vial instructions direct. Then pull the needle straight out.

   A drop of blood is fine. Press gauze on the site, but do not rub it.

6. 06

   Step 6: Dispose of the syringe safely

   Do not recap the needle. Recapping is how needle-stick injuries happen. Put the whole syringe straight into your sharps container, never the household trash.

The answer to where to inject tirzepatide is the same on the FDA label and on MedlinePlus: the stomach (abdomen), the thigh or the back of the upper arm. The Zepbound instructions add that the upper arm should be injected by another person, and that stomach injections sit at least 2 inches from the belly button.

Those three tirzepatide injection sites behave the same in the body: the Zepbound label reports similar exposure to tirzepatide in the abdomen, thigh and upper arm, so no tirzepatide injection site gives a stronger dose.

Learning how to inject tirzepatide in stomach skin starts with the spot: below your ribs and above your hip bones, 2 inches from the navel. For the thigh, use the front or outer side of the upper thigh.

Rotation matters as much as the site you pick. The Zepbound vial instructions say to change sites within your chosen area every dose, to lower the risk of lipodystrophy (pitted or thickened skin) and localized cutaneous amyloidosis (lumps under the skin). MedlinePlus suggests moving at least 1 inch from the last site. A simple pattern:

1. Week 1: left side of the stomach, upper half
2. Week 2: right side of the stomach, upper half
3. Week 3: left side of the stomach, lower half
4. Week 4: right side of the stomach, lower half, then switch to the thighs or start over

As for where to inject tirzepatide for best results, the label data point to consistency over location: the right units, the same day each week and a rotated site.

• Keep the same injection day. MedlinePlus notes you can change the day as long as at least 3 days separate two doses.
• Store the vial as the pharmacy label directs, out of children's reach.
• Write down the date, units and site after every dose.
• Tie the injection to a fixed weekly habit. Harbor's guide to a weekly routine around GLP-1 injections has ideas.
• When your sharps container is about three-quarters full, follow your community's disposal rules, as the FDA advises.

Some soreness is normal. Spreading redness, swelling, red streaks or a fever can point to infection, so message your clinician.