How to Give a Gluteal Injection: A Safe Method

The safest method for giving a gluteal intramuscular injection centers on one key choice: using the ventrogluteal site, located on the side of the hip, rather than the traditional upper-outer buttock. A meta-analysis comparing the two sites found that ventrogluteal injections produced less pain, less bleeding, and fewer hematomas than dorsogluteal injections. Despite decades of evidence supporting this shift, many clinicians and patients still default to the buttock, a habit that carries real and avoidable risks.

Why the Ventrogluteal Site Is the Preferred Target

The gluteal region has two commonly used injection zones. The dorsogluteal site sits in the upper-outer quadrant of the buttock, the spot most people picture when they think of a “butt shot.” The ventrogluteal site is on the side of the hip, over the gluteus medius muscle, and it is the location that nursing guidelines now recommend for most intramuscular injections in adults.

The reason comes down to what lies beneath the skin. The dorsogluteal site is close to the sciatic nerve and the superior gluteal artery. A needle that goes slightly off-target in the buttock can damage the nerve or puncture a vessel. The ventrogluteal site, by contrast, is free of major nerves and large blood vessels, and the muscle there is thick and well-defined. A systematic review and meta-analysis of studies comparing the two sites found that ventrogluteal injections resulted in meaningfully lower pain scores, less bleeding, and smaller hematomas at both 48 and 72 hours after injection.¹

The ventrogluteal site also has less subcutaneous fat sitting on top of the muscle. A cross-sectional study using imaging data confirmed that subcutaneous fat was significantly thicker at the dorsogluteal site than the ventrogluteal site, and that the difference was especially pronounced in women.² Thicker fat means the needle is more likely to deposit medication into fat instead of muscle, which can alter how the drug absorbs and lead to local complications.

For older adults, the advantages hold up. A study examining tissue thickness at both sites in elderly patients found that while both met minimum safety thresholds, the ventrogluteal site had greater muscle thickness and thinner subcutaneous tissue, making it less likely that the needle would contact bone or fail to reach muscle.³

Locating the Ventrogluteal Site

Knowing that the ventrogluteal site is safer only matters if you can find it reliably. Two main landmark methods are used, and both have been validated with ultrasound imaging to confirm they consistently land over muscle and away from nerves and vessels.⁴

The most commonly taught method works like this: if you are injecting the person’s right hip, place the heel of your left hand on the greater trochanter, the bony bump on the side of their hip that you can feel when they lie on their side. Point your index finger toward the front of the hip bone (the anterior superior iliac spine) and spread your middle finger back toward the iliac crest, the curved top of the hip bone. The triangle formed between your two fingers and the base of your palm is the injection zone. You inject into the center of that V-shaped area.

The person receiving the injection can be lying on their side with the top leg slightly bent forward, lying face-down with toes pointed inward to relax the muscle, or even standing with their weight shifted to the opposite leg. Side-lying tends to be the easiest position for both the person giving and receiving the injection, because the landmarks are clearly accessible and the muscle is naturally relaxed.

Choosing the Right Needle

A gluteal injection only works if the needle actually reaches the muscle. This sounds obvious, but research suggests the failure rate is disturbingly high. A narrative review compiling CT-verified data from multiple studies found that only about a third to half of intended intramuscular gluteal injections actually reached the muscle, with the rest depositing medication into subcutaneous fat instead.⁵ The success rate was dramatically worse in women: in one study, only 8% of female patients received a truly intramuscular injection compared to 56% of males.

The primary culprit is needle length. Standard practice often uses a 1.5-inch (3.8 cm) needle for all adults, but that one-size-fits-all approach fails anyone with a thicker fat layer. A study using MRI scans of over 350 adults found that a 1.5-inch needle reliably reached muscle at the ventrogluteal site in women with a BMI up to about 30 and men with a BMI up to about 35. Above those thresholds, the failure rate climbed sharply, reaching roughly 70% in women with a BMI over 30 and about 60% in men with a BMI over 35.⁶

A meta-analysis of tissue-thickness data across studies confirmed average muscle thickness at the ventrogluteal site was around 36 to 38 mm, with subcutaneous tissue averaging close to 20 mm, though individual variation was wide.⁷ For people with higher body mass, a 2-inch needle or longer may be necessary. The gauge matters less for depth but affects comfort; 21- to 23-gauge needles are typical for adult gluteal injections, balancing flow rate with pain.

The Injection Technique Step by Step

Once you have located the ventrogluteal site and selected a needle, the actual injection follows a sequence designed to minimize pain, prevent drug leakage, and reduce tissue damage.

Clean the skin: Wipe the injection site with an alcohol swab in a circular motion from center outward. Let it dry completely before injecting, as introducing alcohol into tissue stings and can interfere with some medications.
Stretch the skin: Using your non-dominant hand, pull the skin taut over the injection site. This is the start of the Z-track technique, where you displace the skin and subcutaneous tissue laterally before inserting the needle. When you release after withdrawing the needle, the skin slides back and seals the track, preventing medication from leaking out along the needle path.
Insert at 90 degrees: Push the needle in perpendicular to the skin surface with a quick, smooth, dart-like motion. Hesitating or going slowly increases pain.
Inject slowly: Depress the plunger at a steady rate, roughly 1 mL per 10 seconds. Rapid injection forces medication into tissue faster than it can disperse, which increases pressure and pain.
Wait before withdrawing: After the plunger is fully depressed, hold the needle in place for about 10 seconds. This gives the medication time to begin dispersing and reduces the chance of it tracking back up the needle path.
Withdraw and release: Pull the needle out smoothly at the same angle it went in, then release the displaced skin. Apply gentle pressure with a gauze pad but avoid massaging the area, as rubbing can push medication into subcutaneous tissue or cause irritation.

The Z-track method has been studied specifically for its effect on drug leakage. One trial found that using the Z-track technique with intramuscular diclofenac reduced the amount of medication leaking to the skin surface compared to standard injection, though the reduction in pain did not reach statistical significance in that study.⁸ A broader systematic review reached a similar conclusion: the Z-track technique’s main advantage is preventing leakage rather than reducing pain.⁹ Still, preventing leakage matters for both drug effectiveness and for avoiding skin reactions to irritating medications.

The Aspiration Question

You may have been taught to pull back on the plunger before injecting to check for blood, a practice called aspiration. The idea is to confirm the needle has not entered a blood vessel. For the ventrogluteal site, current evidence and most guidelines say aspiration is unnecessary, because there are no large blood vessels in the area. The dorsogluteal site, however, sits near the gluteal artery, and aspiration is still recommended if that site is used.¹⁰ Skipping aspiration at the ventrogluteal site is not cutting corners; it reduces the time the needle sits in tissue, which reduces pain and the chance of the needle shifting.

What Can Go Wrong

The most serious complication of gluteal injection is sciatic nerve injury, and it is almost exclusively a dorsogluteal problem. The sciatic nerve is the largest nerve in the body, running through the buttock on its way down the leg, and it is the nerve most commonly damaged by intramuscular injections.¹¹ Symptoms can range from brief pain radiating down the leg to permanent sensory loss and foot drop. Children, elderly people, and underweight individuals are especially vulnerable because their nerve sits closer to the surface. One case report described a 68-year-old man who developed chronic intractable neuropathic pain after a dorsogluteal injection that did not improve even as his motor weakness partially recovered.¹² MRI neurography in patients with sciatic injection injuries has shown continuity of nerve damage extending well beyond the injection site, consistent with severe axonal injury.¹³

The ventrogluteal site avoids the sciatic nerve entirely, which is the single strongest argument in its favor. But no injection site is without any risk. Local complications can include:

Fat necrosis: When medication is deposited into fat rather than muscle, it can cause tissue death that shows up as firm, painless lumps under the skin weeks or months later.¹⁴
Abscess and cellulitis: Infection at the injection site, usually from contaminated equipment or poor skin preparation. In one pediatric series reviewing buttock injection complications, acute inflammation including cellulitis and abscess accounted for roughly 72% of local complications, followed by fat necrosis at about 22%.¹⁵
Hematoma: Bleeding into tissue, which is more common at the dorsogluteal site where vessels are more plentiful.

Many of these complications are dose-dependent in the sense that they are more likely with irritating medications, large volumes, or repeated injections at the same spot. Rotating injection sites when giving frequent injections helps prevent tissue buildup damage.

Body Shape Matters More Than You’d Think

One underappreciated factor in gluteal injection success is that the same site-location method does not work equally well for every body type. A randomized controlled trial found that selecting the gluteal injection site based on the patient’s body shape pattern led to less injection pain compared to using the standard dorsogluteal landmarks.¹⁶ The logic is straightforward: fat distribution varies enormously between individuals. A person who carries weight in their hips will have a very different tissue profile than someone with the same BMI who carries weight in their abdomen. Sex plays a role too, as subcutaneous tissue at both gluteal sites is consistently thicker in women than in men.²

For people at higher BMIs, this means that the ventrogluteal site is even more important than for leaner individuals, because it has less fat overlay than the dorsogluteal site. But it also means a longer needle may be necessary, and clinicians should be making individualized assessments rather than reaching for the same equipment every time.

Why the Outdated Site Persists

If the evidence is this clear, why do so many healthcare providers still inject into the upper-outer buttock? Surveys of nurses tell a consistent story: most did not learn the ventrogluteal technique during their training, and many report feeling uncertain about finding the landmarks. One study found that the majority of nurses surveyed did not prefer the ventrogluteal site, citing a lack of knowledge on locating it and concern about harming patients.¹⁷ The irony is thick: nurses avoid the safer site because they are worried about safety. A separate analysis noted that advancing the use of the ventrogluteal site remains a challenge because nurses lack familiarity with the anatomical landmarks and with the published evidence supporting the switch.¹⁸

This is slowly changing. Nursing education programs are increasingly teaching the ventrogluteal site as the default for gluteal injections, and clinical guidelines now recommend it. But the gap between what guidelines say and what happens in practice is wide, especially in settings where rapid-turnaround injections are common and staff default to the method they learned first.

Self-Injection Considerations

Some medications, particularly testosterone and certain long-acting psychiatric drugs, require regular gluteal injections that people learn to give themselves. Self-injection into the ventrogluteal site is possible, though it requires more body awareness than injecting into the thigh (the vastus lateralis), which is the most common self-injection site for intramuscular medications. If you are self-injecting into the gluteal area, the ventrogluteal site can be reached by twisting slightly and using your opposite hand to palpate the landmarks. Practicing landmark location before the first injection, ideally with guidance from a clinician, builds confidence.

For people who self-inject frequently, the success-rate data is worth keeping in mind. Given that studies show a large proportion of intended intramuscular injections actually land in subcutaneous fat, self-injectors should pay close attention to needle length relative to their body composition.⁵ If you notice that your medication seems less effective or takes longer to kick in, accidental subcutaneous delivery is a plausible explanation worth discussing with your prescriber.

When Ultrasound Changes the Equation

In clinical settings where precision matters most, such as with expensive medications or patients whose anatomy makes landmarks unreliable, ultrasound-guided injection is an emerging tool. A portable ultrasound can visualize the skin, fat layer, fascia, and muscle in real time, letting the clinician confirm needle depth and avoid vessels or nerves during the injection itself.¹⁹ This is not standard for routine vaccinations or common medications, but it is increasingly used in research settings and for patients whose body habitus makes landmark palpation difficult. As portable ultrasound devices become cheaper and more accessible, the technique could eventually reduce the high rate of inadvertent subcutaneous delivery that current evidence documents.

1
PubMed Central. Adverse effects of dorsogluteal intramuscular injection versus ventrogluteal intramuscular injection: A systematic review and meta‐analysis
2
PubMed. Ventrogluteal versus dorsogluteal site selection: A cross-sectional study of muscle and subcutaneous fat thicknesses and an algorithm incorporating demographic and anthropometric data to predict injection outcome
3
PubMed. Examining the Safety of Dorsogluteal and Ventrogluteal Sites for Intramuscular Injection in Older Adults
4
PubMed Central. The reliability of site determination methods in ventrogluteal area injection: a cross-sectional study
5
PubMed Central. A narrative review of the success of intramuscular gluteal injections and its impact in psychiatry
6
American Journal of Therapeutics. Body Mass Index: A Reliable Predictor of Subcutaneous Fat Thickness and Needle Length for Ventral Gluteal Intramuscular Injections
7
PubMed Central. Gluteal muscle and subcutaneous tissue thicknesses in adults: a systematic review and meta-analysis
8
PubMed. The Effect of the Z-Track Technique on Pain and Drug Leakage in Intramuscular Injections
9
PLOS ONE. The effect of intramuscular injection technique on injection associated pain; a systematic review and meta-analysis
10
PubMed. Aspirating during the intramuscular injection procedure: a systematic literature review
11
PubMed. Sciatic nerve injection injury
12
PubMed Central. Iatrogenic Injury to the Sciatic Nerve due to Intramuscular Injection: A Case Report
13
PubMed. MR neurography of sciatic nerve injection injury
14
PubMed Central. Fat necrosis: A neglected side effect of intramuscular injections
15
Journal of the Korean Association of Pediatric Surgeons. Local Complications after Intramuscular Injections in the Buttock in Children
16
PubMed. Evaluation of the effect of selecting gluteal injection site on the pain injection based on anthropometric indices and body shape pattern: A randomised controlled trial study
17
PubMed Central. Creating a change in the use of ventrogluteal site for intramuscular injection
18
PubMed. Recognizing the evidence and changing practice on injection sites
19
Health. Efficacy and Safety in Intramuscular Injection Techniques Using Ultrasonographic Data