Medication Administration: Intramuscular Injections - Home Health Care
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Medication Administration: Intramuscular Injection (Home Health Care) - CE/NCPD
ALERT
Intramuscular (IM) injections have been associated with adverse reactions and pain. This route of medication injection is used as a last resort. Consider contacting the practitioner for an alternative, preferred route of medication administration.
Take steps to eliminate interruptions and distractions during medication preparation.
OVERVIEW
The IM injection route deposits medication into deep muscle tissue, which has a rich blood supply, allowing medication to be absorbed faster than it would be by the subcutaneous route. This rich blood supply, however, increases the risk for injecting medication directly into blood vessels. Any factor that interferes with local tissue blood flow affects the rate and extent of drug absorption.
An IM injection may require a long, large-gauge needle to penetrate deep muscle tissue.undefined#ref2">2 The appropriate needle length is determined by the patient’s size, age, and the amount of adipose tissue in the chosen injection site.2,7 The needle must be long enough to reach the muscle tissue but not too long to present the risk of hitting underlying neurovascular structures or bone.2
IM injections should be administered so that the needle is perpendicular to the patient’s body or as close to a 90-degree angle as possible (Figure 1).2 IM injection sites should also be rotated to decrease the risk for hypertrophy. When possible, IM injections should be avoided in muscles that are emaciated or atrophied because these muscles absorb medication poorly.5
Aspiration before injection and slow injection of the medication are not supported by research for vaccine administration.2 For all other medications, there is no evidence to either support or abandon the practice of aspiration before administration. More research is needed to investigate the practice of aspiration before administering an IM injection with medications other than vaccines.9 The vastus lateralis and deltoid muscles are the only two sites recommended for vaccine administration because these sites do not contain large vessels that are within reach of the needle.2,5 The recommended route and site for each vaccine are included in the manufacturer’s instructions for use.2
Muscle tissue is less sensitive than subcutaneous tissue to irritating and viscous medications. Small muscles absorb small volumes. For a well-developed adult, no more than 3 ml of medication should be administered in a single IM injection because the muscle tissue does not absorb it well in larger volumes.5,8 For smaller adults or those with less muscle mass, the volume injected may need to be adjusted. There may be exceptions for specific medications. Refer to the organization’s formulary.
The Z-track method, in which the skin is pulled laterally before injection, prevents medication leakage into subcutaneous tissue, seals medication in the muscle, and minimizes irritation. This method can be used, provided that the overlying tissue can be displaced. To use the Z-track method in an adult, the appropriate-size needle is attached to the syringe, and an IM site is selected. After cleansing the site, the overlying skin and subcutaneous tissues are pulled to the side with the ulnar side of the nondominant hand. The skin is held in this position until the injection has been administered. The needle is injected deep into the muscle and the medication is injected slowly. After the needle is withdrawn, the skin is released. The displacement of the skin and muscle layer closes off the needle track when the skin is released (Figure 2).5
Injection sites
For IM injections, the nurse selects a site that is free of pain, infection, necrosis, bruising, and abrasions. The location of underlying bones, nerves, and blood vessels and the volume of medication to be administered are also considered. Because of the sciatic nerve location, the dorsogluteal muscle is not recommended as an injection site. If a needle hits the sciatic nerve, the patient may experience partial or permanent paralysis of the leg.5,8 The rectus femoris is no longer considered a safe injection site because of the risk of damage to the descending branch of the lateral circumflex femoral artery and the muscle branch of the femoral nerve to the vastus lateralis.6
Ventrogluteal site
The ventrogluteal site involves the gluteus medius and minimus muscles and is a safe injection site for adults.5 This site provides the greatest thickness of gluteal muscle, is free of penetrating nerves and blood vessels, and has a narrower layer of fat. The ventrogluteal muscle is the preferred and safest site for all adults, children, and infants for medications with larger volumes that may be more viscous and irritating.5,8 The ventrogluteal site should be used with caution in infants.1 It is recommended that only an experienced pediatric health care team member use this site.
To locate the ventrogluteal site, the heel of the hand is placed over the greater trochanter of the patient’s hip with the wrist almost perpendicular to the femur. The right hand is used for the left hip, and the left hand for the right hip. The thumb is pointed toward the patient’s groin, with the index finger pointing to the anterior superior iliac spine, and the middle finger is extended back along the iliac crest toward the buttock. The index finger, the middle finger, and the iliac crest form a V-shaped triangle. The injection site is the center of the triangle (Figure 3). To relax this site, the patient lies on the side or back, flexing the knee and hip.
Vastus lateralis muscle
The vastus lateralis muscle is another injection site used in adults. This muscle is thick and well developed and is located on the anterior lateral aspect of the thigh. It extends, in an adult, from a handbreadth above the knee to a handbreadth below the greater trochanter of the femur (Figure 4). The middle third of the muscle is used for injection. To help relax the muscle, the patient is asked to lie supine, with the knee slightly flexed and foot externally rotated, or to assume a sitting position.
Deltoid muscle
Although the deltoid site is easily accessible, this muscle is not well developed in many adults. There is potential for injury because the axillary, radial, brachial, and ulnar nerves and the brachial artery lie within the upper arm under the triceps and along the humerus (Figure 5). This site is used for small medication volumes (2 ml or less)5,8 and for administration of routine immunizations in adults.2
The deltoid muscle is located by fully exposing the patient’s upper arm and shoulder and asking the patient to relax the arm at the side or by supporting the patient’s arm and flexing the elbow. Next, the lower edge of the acromion process, which forms the base of a triangle in line with the midpoint of the lateral aspect of the upper arm, is palpated. The nurse measures 2 to 3 finger widths3 down from the acromion process and visualizes a triangle, with the base at the acromion process and the apex pointing toward the elbow. The injection site is found in the center of the triangle (Figure 5).
To avoid shoulder injury related to vaccine administration, the nurse should always sit to inject into the arm of a seated patient to ensure that the angle of the needle is correct. If the patient’s shirt cannot be removed, the sleeve should be rolled up so that landmarks can be visualized and used appropriately.3
Rarely, an adverse reaction occurs after immunizations. Reactions may include anaphylaxis, anaphylactic shock, and neurologic deficits.10 Vaccine adverse event reporting is monitored by the Centers for Disease Control and Prevention.
If the patient, family, or caregivers express concern regarding the accuracy of a medication, the medication should not be given. The concern should be explored, the practitioner notified, and the order verified.
SUPPLIES
See Supplies tab at the top of the page.
EDUCATION
Provide developmentally and culturally appropriate education based on the desire for knowledge, readiness to learn, and overall neurologic and psychosocial state.
Assess the patient’s, family’s, and caregivers’ learning readiness.
Explain the procedure for an IM injection, including the purpose of the injection and the reason for using the IM route.
Explain the risks related to the procedure, including hematoma formation, nerve injury, and allergic reaction to the medication.
Instruct the patient, family, and caregivers regarding the potential side effects and adverse reactions to the medication.
If the patient requires regular injections, instruct the patient and the family or caregivers on injection techniques and the importance of rotating sites to decrease the risk for hypertrophy.
Have the patient, family, or caregivers perform several return demonstrations of medication preparation to validate learning.
Instruct the patient, family, and caregivers to observe injection sites for complications and to report complications to the practitioner immediately.
Instruct the patient, family, and caregivers to observe for effectiveness of the medication and adverse reactions and to report ineffectiveness of the medication and adverse reactions to the practitioner.
Explain to the patient, family, and caregivers the importance of managing medication information to identify and resolve discrepancies.4
Emphasize to the patient, family, and caregivers that sharing medications with other people is dangerous.
Teach the patient, family, and caregivers to keep all medications out of the reach of children, cognitively impaired adults, and pets.
Provide the patient, family, and caregivers with written information on the medication the patient should be taking.4
Provide the patient, family, and caregivers with the brand and generic names of the prescribed medications.
Encourage questions and answer them as they arise.
PROCEDURE
Perform hand hygiene. Don appropriate personal protective equipment (PPE) based on the patient’s need for isolation precautions or the risk of exposure to bodily fluids.
Introduce yourself to the patient, family, and caregivers.
Verify the correct patient using two identifiers.
Explain the procedure to the patient, family, and caregivers and ensure that the patient agrees to treatment.
Verify the practitioner’s order and assess the patient for pain.
Prepare an area in a clean, convenient location and assemble the necessary supplies.
Obtain, update, and compare information about the medication the patient is currently taking with that of the medications ordered for the patient to identify and resolve discrepancies.4
Assess the patient for specific contraindications to receiving IM injections and advise the practitioner accordingly. Assess for factors such as muscle atrophy, reduced blood flow, skin condition, and circulatory shock.
Assess the patient’s symptoms before initiating medication therapy.
Assess the patient’s knowledge regarding the medication to be received.
Assess the patient’s history of allergies, including any drug allergies, type of allergens, and normal allergic reaction.
Review the patient’s previous verbal and nonverbal responses to injections.
Assess baseline vital signs.
Obtain the medication, check the practitioner’s order, verify the expiration date, and inspect the medication for particulates, discoloration, or other loss of integrity.
Do not use medication that is cloudy or precipitated unless such is indicated by its manufacturer as being safe.
Review medication reference information pertinent to the medication’s action, purpose, onset of action and peak action, normal dose, and common side effects and implications.
Assemble appropriate-size needles, syringes, and other administration supplies.
Ensure the six rights of medication safety: right medication, right dose, right time, right route, right patient, and right documentation. Compare the medication administration record to the patient’s identifiers.
Provide privacy for the patient.
Perform hand hygiene and don gloves.
Keep a sheet or gown draped over body parts not requiring exposure.
Select the appropriate site for injection based on the patient’s age, muscle tissue mass, and medication volume and viscosity.
Inspect the skin surface over sites for bruises, inflammation, or edema.
Rationale: Injection sites should be free of abnormalities that interfere with drug absorption (e.g., bruising, signs associated with infection).
Note the integrity and size of the muscle. Palpate for tenderness or hardness and avoid hardened areas. If the patient receives frequent injections, rotate sites.
Rationale: Sites used repeatedly become hardened from lipohypertrophy (increased growth in fatty tissue).
Assist the patient to a comfortable position that is appropriate for the chosen injection site (e.g., sitting, supine, side-lying, prone).
Rationale: A comfortable position reduces strain on the muscle and minimizes injection discomfort.
Locate the injection site again using anatomic landmarks. The ventrogluteal site is a safe injection site for adults receiving irritating or viscous solutions and is the site of choice for administering IM injections to adults.5 In addition, this site provides the greatest thickness of gluteal muscle, is free of penetrating nerves and blood vessels, and has a narrower layer of fat.5
Rationale: Injection into the correct anatomic site prevents injury to nerves, bone, and blood vessels.
The dorsogluteal site is not recommended because of proximity to the sciatic nerve.5
Cleanse the site with alcohol or an antiseptic swab, per the organization’s practice. Allow the skin to dry completely. Optional: Use a vapocoolant spray (e.g., ethyl chloride) for pain relief just before injection.
Rationale: A vapocoolant spray decreases pain at the injection site.
Hold a clean swab or dry gauze between the third and fourth fingers of the nondominant hand.
Rationale: The swab or gauze remains readily accessible for use when withdrawing the needle.
Remove the needle cap by pulling it straight off.
Rationale: Pulling the cap straight off prevents the needle from touching the sides of the cap, thus preventing contamination.
Hold the syringe between the thumb and forefinger of the dominant hand as if holding a dart, palm down.
Rationale: A quick, smooth injection requires proper manipulation of the syringe parts.
With your nondominant hand, pull the skin taut.
Administer the injection using the Z-track method, if appropriate.
Position the ulnar side of the nondominant hand just below the site and pull the skin laterally. Hold this position until the medication is injected.
With the dominant hand, inject the needle quickly into the muscle at a 90-degree angle using a steady and smooth motion.5,8
Rationale: The Z-track technique creates a zigzag path through tissues that seals the needle track to avoid tracking medication. A quick, dart-like injection reduces discomfort. Z-track injections may be used for all IM injections.5,8
After the needle pierces the skin, use the thumb and forefinger of the nondominant hand to hold the syringe barrel while still pulling on the skin. Move the dominant hand to the end of the plunger. Avoid moving the syringe.
Rationale: Smooth manipulation of the syringe reduces discomfort from needle movement. Skin remains pulled until after medication is injected to ensure Z-track administration.
Optional: If the patient’s muscle mass is small, grasp the body of the muscle between the thumb and forefingers of the nondominant hand while still pulling the skin laterally.
Rationale: Grasping the muscle body helps to ensure that the medication reaches the muscle mass.
Per the organization’s practice, pull back on the plunger. If no blood appears, inject the medication. If blood appears in the syringe, remove the needle, discard the medication, obtain a new syringe, and try again.
Rationale: Aspiration of blood into the syringe indicates possible placement into a vein.
Rationale: There is no definitive research to recommend eliminating aspiration other than for vaccination and toxoids.5,8
Smoothly, quickly, and steadily withdraw the needle and release the skin. Apply a dry cotton ball or gauze with light pressure for several seconds over the site.
If not using the Z-track method, follow these steps for injection.
With the dominant hand, inject the needle quickly into the muscle at a 90-degree angle using a steady and smooth motion.5,8
After the needle pierces the skin, use the thumb and forefinger of the nondominant hand to hold the syringe barrel while still pulling on the skin. Move the dominant hand to the end of the plunger. Avoid moving the syringe.
Optional: If the patient’s muscle mass is small, grasp the body of the muscle between the thumb and forefingers of the nondominant hand.
Rationale: Grasping the muscle body helps to ensure that the medication reaches the muscle mass.
Per the organization’s practice, pull back on the plunger. If no blood appears, inject the medication. If blood appears in the syringe, remove the needle, discard the medication, obtain a new syringe, and try again.
Rationale: Aspiration of blood into the syringe indicates possible placement into a vein.
Rationale: There is no definitive research to recommend eliminating aspiration other than for vaccination and toxoids.5,8
Smoothly, quickly, and steadily withdraw the needle. Apply a dry cotton ball or gauze with light pressure for several seconds over the site.
Apply gentle pressure to the site; do not massage. Assess the site and apply a bandage if needed.
Rationale: Massage damages underlying tissue.
Assist the patient to a comfortable position.
Discard the uncapped needle (or needle enclosed in a safety shield) and the attached syringe into a puncture-proof and leakproof receptacle.
Rationale: Discarding the uncapped needle helps prevent injury to the patient and staff. Recapping needles increases the risk for a needlestick injury.7
Reassess the injection site.
Report profuse bleeding, hematoma, loss of function, and signs and symptoms of infection.
Stay with the patient for several minutes. Monitor the patient for adverse and allergic reactions to the medication. Recognize and immediately treat respiratory distress and circulatory collapse, which are signs of a severe anaphylactic reaction. Follow the organization’s practice for emergency response.
Report rash, seizures, and difficulty breathing.
Discard or store supplies, remove PPE, and perform hand hygiene.
Document the procedure in the patient’s record.
EXPECTED OUTCOMES
Medication is administered according to the six rights of medication safety.
Patient experiences no pain or only mild burning at injection site.
Patient achieves desired effect of medication with no adverse reactions, signs of allergies, or undesired effects.
Patient demonstrates acceptable level of comfort after injection.
Patient explains purpose, dose, and effects of medication.
Patient, family, and caregivers can teach-back correct placement and method for injection.
UNEXPECTED OUTCOMES
Medication is not administered according to the six rights of medication safety.
Patient complains of localized pain, bleeding, or continued burning at injection site, indicating potential injury to nerve or vessels.
Medication is administered in subcutaneous tissue.
Patient displays adverse reaction to the medication, with signs of urticaria, eczema, pruritus, wheezing, or dyspnea.
Other adverse effects occur: hematoma or abscess; infection; fibrosis of the muscle (tissue damage because of patient movement during injection); glass particles injected into muscle as a result of not using a filter needle; permanent damage to sciatic nerve resulting in paralysis, fibrosis, or abscess.
Patient experiences unmanaged pain.
Patient, family, and caregivers cannot teach-back correct placement or method of injection.
DOCUMENTATION
Medication name, dose, route, site, time, and date of administration
Patient’s response to the medication, including any adverse reactions
Unexpected outcomes and related interventions
Education
Patient’s progress toward goals
Comfort assessment and any interventions performed
OLDER ADULT CONSIDERATIONS
Older adult patients may have decreased muscle mass, which reduces drug absorption from IM injections.
Older adults may have loss of muscle tone and strength that impairs mobility, placing them at high risk for falls as a result of guarding an injection site.
Anderson, C.E., Herring, R.A. (2022). Chapter 20: Pediatric nursing interventions and skills. In M.J. Hockenberry, C.C. Rodgers, D. Wilson (Eds.), Wong’s essentials of pediatric nursing (11th ed., pp. 551-618). St. Louis: Elsevier.
Lilley, L.L., Rainforth Collins, S., Snyder, J.S. (2023). Chapter 9: Photo atlas of drug administration. In Pharmacology and the nursing process (10th ed., pp. 102-134). St. Louis: Elsevier.
Nakajima, Y. and others. (2020). Anatomically safe sites for intramuscular injections: A cross-sectional study on young adults and cadavers with a focus on the thigh. Human Vaccines and Immunotherapeutics, 16(1), 181-196. doi:10.1080/21645515.2019.1646576 (Level V)
Ostendorf, W.R. (2022). Chapter 22: Parenteral medications. In A.G. Perry and others (Eds.), Clinical nursing skills and techniques (10th ed., pp. 652-708). St. Louis: Elsevier.
Sepah, Y. and others. (2017). Aspiration in injections: Should we continue or abandon the practice? (version 3, peer review, 2 approved). F1000Research, 3, 157. doi:10.12688/f1000research.1113.3 (classic reference)*
Wodi, A.P., Shimabukuro, T. (2021). Chapter 4: Vaccine safety. In E. Hall and others (Eds.), Epidemiology and prevention of vaccine-preventable diseases (14th ed., pp. 43-52). Centers for Disease Control and Prevention (CDC). Washington, DC: Public Health Foundation. Retrieved February 11, 2023, from https://www.cdc.gov/vaccines/pubs/pinkbook/safety.html (Level VII)
Institute for Safe Medication Practices (ISMP). (2012). Side tracks on the safety express. Interruptions lead to errors and unfinished…Wait, what was I doing? Retrieved February 11, 2023, from (classic reference*)
U.S. Food and Drug Administration (FDA). (2021). Safely using sharps (needles and syringes) at home, at work and on travel. Retrieved February 11, 2023, from
*In these skills, a “classic” reference is a widely cited, standard work of established excellence that significantly affects current practice and may also represent the foundational research for practice.
Elsevier Skills Levels of Evidence
Level I - Systematic review of all relevant randomized controlled trials
Level II - At least one well-designed randomized controlled trial
Level III - Well-designed controlled trials without randomization
Level IV - Well-designed case-controlled or cohort studies
Level V - Descriptive or qualitative studies
Level VI - Single descriptive or qualitative study
Level VII - Authority opinion or expert committee reports
