In this section
Definition of Terms
A medication administered into a muscle is known as an intramuscular (IM) injection. The IM route allows for rapid absorption of specific medications. Choosing a muscle is dependent on the medication volume and the age or size of the patient. Poor technique and incorrect landmarking of
the injection site can lead to site reactions, sub-optimal medication absorption and adverse events.
For IM immunisation information, please refer to
The Australian Immunisation Handbook.
This guideline aims to facilitate the administration of intramuscular injections to maximise the therapeutic effect while minimising potential complications and patient discomfort.
Anterolateral: Anterior and lateral position situated in the front and to the side.
trochanter:A bony prominence at the top of the femur where the hip and thigh muscles are fixed.
informed practice: ‘Trauma-informed care is a way of approaching interactions with children and families in which providers remain cognizant of the impacts of trauma while also taking actions to prevent potentially traumatic experiences’ (Boles, 2017).
Z- tracking: A technique used to prevent medication leakage, particularly for oily injections. Displace the skin and subcutaneous tissue by pulling the skin laterally or downward from the injection site. Holding it taut, quickly and smoothly insert the needle into the muscle at a 90-degree
angle. This technique is preferred in adult/ adolescent patients.
Clinical judgement is required when selecting an injection site and needle length.
Neonate or Infant
(Recommended site for all IM Adrenaline)
25g x 25mm or 23g x 25mm
(16mm length can be used for neonates or small infants
Infant or child
(18 months–3 years)
Child or Adolescent
Infant, child or adolescent
23g x 25mm or 21g x 38mm
(38mm length preferred in larger, overweight or obese patients)
The anterolateral aspect of the thigh, or vastus lateralis muscle, is the preferred IM site for neonates and infants. Up to 1ml can be injected into this site in neonates, up to 3mls in children and up to 5mls in adults. This is the preferred site for anaphylaxis
management in all ages.
To landmark the vastus lateralis, position the patient lying down or being held by a parent. Palpate the muscle below the greater trochanter and above the lateral femoral condyle (knee joint). Divide the muscle into thirds and administer the injection into the middle third of the muscle, in the outer anterolateral
aspect, lateral to the midpoint of the thigh.
The deltoid muscle is the preferred injection site in children aged 3-18 years when muscle mass is more developed. It is suitable for small volume injections. The recommended volume is 1ml; however, up to 2mls can be administered.
The deltoid muscle is a rounded triangle shape. To landmark this site, the patient should be sitting comfortably with their arm visible from the shoulder to the top of the elbow. Palpate the acromion (outer edge of the scapula) and trace an imaginary inverted triangle below the
shoulder. The injection should be given 3-5cms below the acromion, in the middle of the triangle.
The dorsogluteal is not the preferred site due to its proximity to the sciatic nerve and major blood vessels. If landmarked correctly however, it is safe to use. Up to 4mls can be injected into this site.
The patient can be positioned lying on their stomach or standing up. The muscle is located in the upper outer quadrant of the buttock, approximately 5-8cm below the iliac crest. For confirmation, an imaginary line can be drawn between the posterior superior
iliac spine and the greater trochanter of the femur.
The patient can be positioned lying on their stomach, side or standing up. To locate the muscle, place the palm of a hand over the greater trochanter of the femur, facing the index finger and thumb towards the umbilicus, along the anterior iliac spine. Place the middle finger toward the iliac crest creating a
‘V’ shape. The injection is given in the middle of the ‘V’.
A hypodermic needle is used to administer IM injections. These come in different sizes (gauge and length) and are selected based on the patient’s size and the muscle used. A higher gauge needle refers to a smaller outside diameter of the needle tubing.
Needle sizes most commonly used at the RCH include:
The Australian Immunisation Handbook (health.gov.au)
The evidence table for this guideline can be accessed here.
All images and videos were created by the Royal Children’s Hospital Creative Studios for the purpose of this guideline.
Please remember to
read the disclaimer.
The development of this nursing guideline was coordinated by Mica Schneider, RN Specialist Clinics, and approved by the Nursing Clinical Effectiveness Committee. First published May 2022.