The Z-track injection technique

Key points

• 01What the technique is in one sentence. You offset the skin and fat sideways before the needle goes in, keep them offset for the whole injection, and release them only after the needle is out, so the entry hole in the skin no longer lines up with the entry hole in the muscle.
• 02Why the offset matters. When the layers slide back, the needle track through them is no longer a straight tunnel. Medication that would otherwise seep back along the track toward the surface hits a discontinuity instead. The name comes from the shape the track makes.
• 03Where it came from. The method was popularised for medications that stain or irritate tissue when they leak upward, iron preparations being the standard example. Nursing journals were publishing step-by-step Z-track instructions in the 1990s and 2000s and they have stayed in the texts since.
• 04What modern guidance says about using it routinely. Contemporary nursing references, including the evidence-based technique review published in Nursing Standard in 2014, describe Z-track as the default for adult intramuscular injection rather than a special case reserved for irritant drugs.
• 05What the trial evidence measured. A 2016 study in Clinical Nurse Specialist looked directly at the effect of the Z-track technique on pain and drug leakage in intramuscular injections. Leakage and pain are the two outcomes the method is claimed to change, so that is the study to know.
• 06It is a teachable skill, and teaching it works. A 2025 single-group study in the International Emergency Nursing journal evaluated the effect of Z-track training on emergency nurses, and a 2023 paper in Revista Brasileira de Enfermagem produced and validated an educational video for it. The hand movement is the part people get wrong.
• 07The displacement is about an inch, not a pinch. Nursing descriptions put the lateral or downward movement at roughly 2.5 cm. Pinching the skin up is a different technique used for subcutaneous injections and it does the opposite of what is needed here, since it lifts tissue away from muscle.
• 08Use the edge of the hand, not two fingertips. Fingertips concentrate the pull on a small patch and tend to slip once the needle goes in. The flat ulnar edge of the hand moves a wider sheet of tissue and stays put, which matters because the grip has to survive the whole injection.
• 09The ten-second pause is part of the method. Holding the plunger down and the skin displaced for about ten seconds before withdrawing appears throughout the nursing literature. Skipping it is the most common reason people still see a bead of medication at the surface afterwards.
• 10Release order is not negotiable. Needle out first, then release the tissue. Releasing while the needle is still in lets the layers slide back around the shaft and lines the track up again, which is precisely the state the technique exists to avoid.
• 11Do not rub afterwards. Press with gauze instead. Rubbing an intramuscular site works medication back toward the surface and is associated with more soreness. Our post-injection care guide covers what to do and what to leave alone.
• 12It has no role in GLP-1 or insulin injection. Ozempic, Wegovy, Mounjaro, Zepbound, Saxenda, Victoza and insulin are all subcutaneous. They are meant to sit in fat, so sealing a track into muscle is not a goal. If your pen is leaking, our injection leaking out post covers the real causes.

Pre-injection checklist

• ✓Z-track is an intramuscular technique. Subcutaneous injections, including every GLP-1 pen and insulin, do not use it. Our post on intramuscular versus subcutaneous injection covers the difference.
• ✓The technique does not change the site. Find the site the usual way first, then apply the skin displacement to it. Our ventrogluteal injection site guide covers the landmark most often paired with this method.
• ✓You need one hand free. Draw the dose and set everything within reach before you start, because once the skin is displaced you cannot let go to find the alcohol pad.
• ✓Change the needle after drawing up if your instructions say to. A needle wet with medication on the outside can leave a trace in the track, which is one of the problems this technique was designed around.
• ✓This is a technique reference, not medical advice. Your medication, route, dose, site and needle are set by your prescriber.

Step-by-step guide

1. 1

   Wash your hands and lay everything out

   Wash with soap and water for at least 20 seconds. Put the syringe, alcohol pads, gauze and the open sharps container within reach of the hand that will hold the syringe. You will be working one-handed from the moment the skin is displaced.

   Pro tip

   Always check the fluid is clear and colourless before injection.
2. 2

   Draw up the dose and change the needle if instructed

   Draw the volume your prescriber set. If your instructions say to swap the drawing-up needle for a fresh one, do it now. A needle that has been through a stopper is duller, and a needle wet on the outside deposits medication along the track.

   Pro tip

   Always check the fluid is clear and colourless before injection.
3. 3

   Find and clean the site

   Locate the site the way you were taught, wipe it with an alcohol pad in one direction and let it air-dry for at least ten to fifteen seconds. Do the cleaning before the displacement, because you cannot clean skin you are already holding out of place.

   Pro tip

   Always check the fluid is clear and colourless before injection.
4. 4

   Place the side of your non-dominant hand next to the site

   Rest the ulnar edge of your free hand flat on the skin beside the cleaned spot. This is the hand that will do the displacement, and using the flat edge rather than fingertips gives you a wide, even grip on the tissue.

   Pro tip

   Always check the fluid is clear and colourless before injection.
5. 5

   Pull the skin and fat sideways about an inch

   Slide the skin and the fat under it laterally or downward, roughly 2.5 cm, and hold. The tissue moves as a sheet over the muscle. You are not pinching and you are not stretching hard, you are offsetting the upper layers from the muscle underneath.

   Pro tip

   Always check the fluid is clear and colourless before injection.
6. 6

   Keep holding while you insert at 90 degrees

   With the displacement held, insert the needle at a right angle to the skin in one smooth movement. The needle now passes through skin and fat that are sitting off to one side of the muscle entry point. That offset is the whole mechanism.

   Pro tip

   Always check the fluid is clear and colourless before injection.
7. 7

   Follow your local instruction on aspiration

   Some services still ask for a short pull-back on the plunger at gluteal sites, others have dropped it. Whichever applies to you, keep the displacing hand exactly where it is throughout. Letting go now cancels the technique.

   Pro tip

   Always check the fluid is clear and colourless before injection.
8. 8

   Inject slowly and evenly

   Push the plunger at a steady, unhurried rate. Nursing literature consistently associates a slow push with less pain, and a slow push also gives the medication somewhere to go rather than forcing it back up the needle track.

   Pro tip

   Always check the fluid is clear and colourless before injection.
9. 9

   Wait about ten seconds before withdrawing

   With the plunger fully depressed and the skin still displaced, count roughly ten seconds. This pause lets the muscle accept the volume instead of pushing it straight back out when the needle leaves. Nursing texts describe it as part of the method, not an optional extra.

   Pro tip

   Always check the fluid is clear and colourless before injection.
10. 10

    Withdraw, then release the skin

    Pull the needle straight out along the line it went in, and only then let go of the displaced tissue. The layers slide back to their resting position and the offset track closes on itself. Press with gauze without rubbing, then dispose of the syringe intact.

    Pro tip

    Always check the fluid is clear and colourless before injection.

After the injection

• Press a gauze square on the site for a few seconds without rubbing, then let it be.
• Expect a dull ache for a while. Gentle movement of the limb usually settles it faster than keeping still.
• Record the date, the medication, the site and the side, so the next injection goes elsewhere.
• Put the syringe in the sharps container with the needle attached and never recap it.

Common mistakes

Frequently asked questions

Sources

1. The Effect of the Z-Track Technique on Pain and Drug Leakage in Intramuscular Injections. Clinical Nurse Specialist, 2016.
2. Production and validation of an educational video on the use of the Z-Track Technique. Revista Brasileira de Enfermagem, 2023.
3. Evaluation of the effect of Z-track technique training on emergency nurses. International Emergency Nursing, 2025.
4. Ogston-Tuck S. 2014. Intramuscular injection technique: an evidence-based approach. Nursing Standard 29(4):52-59.
5. World Health Organization. Best practices for injections and related procedures toolkit.