Routes of Medication Administration & Techniques
Oral Administration
- Oral administration involves giving medications by mouth, which may include tablets, capsules, liquids, or sublingual forms. This route provides ease of administration but may have delayed onset due to first-pass metabolism through the liver.
- When administering oral medications, always verify the patient can swallow safely and check if medication can be crushed if the patient has difficulty swallowing. Never crush enteric-coated, sustained-release, or sublingual tablets as this alters their intended absorption pattern.
Key Points
- Verify patient identity using two identifiers before administration
- Assess for contraindications such as NPO status, dysphagia, or decreased level of consciousness
- Position patient upright or in high Fowler's position to prevent aspiration
Parenteral Administration
- Parenteral routes include intravenous (IV), intramuscular (IM), subcutaneous (SubQ), and intradermal injections. These routes bypass the digestive system, providing faster onset of action compared to oral routes.
- Parenteral administration requires strict aseptic technique to prevent infection and precise anatomical knowledge for proper injection site selection.
Clinical Case: A 68-year-old patient with diabetes requires insulin administration. The nurse should select a subcutaneous injection site with adequate adipose tissue, rotate injection sites systematically, and pinch the skin appropriately based on the needle length and patient's body composition.
Key Points
- IV route provides immediate drug action but carries highest risk for adverse reactions
- IM injections should be administered at a 90-degree angle using Z-track technique for irritating medications
- SubQ injections typically use a 45-90 degree angle depending on tissue amount and needle length
Intravenous Administration
- IV administration delivers medications directly into the bloodstream through peripheral or central venous access. IV push refers to direct administration of undiluted or diluted medication over a specified time period, while IV infusion involves administration of a diluted medication over a longer period.
- When administering IV medications, nurses must verify compatibility with other infusing solutions, calculate drip rates accurately, and monitor for infiltration, extravasation, or adverse reactions.
- Verify medication order and patient identity using two identifiers
- Perform hand hygiene and gather supplies
- Assess IV site for patency, signs of infiltration or phlebitis
- Prepare medication using aseptic technique
- Flush line with normal saline before and after administration
- Administer medication at prescribed rate
- Monitor patient for adverse reactions
- Document administration and patient response
ALERT: Always check for blood return before administering vesicant medications. Extravasation of vesicants can cause severe tissue damage and necrosis requiring immediate intervention.
Key Points
- Use infusion pumps for precise delivery of IV medications, especially high-alert medications
- Know the maximum concentration and administration rate for each medication
- Monitor vital signs before, during, and after administration of IV medications that may affect hemodynamics
Intramuscular Injections
- IM injections deliver medication deep into muscle tissue, which has rich blood supply for medication absorption. Common sites include the ventrogluteal, vastus lateralis, deltoid, and dorsogluteal muscles.
- The ventrogluteal site is preferred for adult IM injections due to its distance from major nerves and blood vessels, consistent muscle mass, and lower fat content compared to other sites.
Memory Aid: IM Injection Sites
Remember "VVD" for IM injection site preference:
Ventrogluteal (first choice for adults)
Vastus lateralis (first choice for infants)
Deltoid (small volume injections, vaccines)
Key Points
- Use appropriate needle length based on patient size (typically 1-1.5 inches for adults)
- Limit volume to 1 mL for deltoid, 2-3 mL for ventrogluteal and vastus lateralis in adults
- Use Z-track technique for irritating medications to prevent leakage into subcutaneous tissue
Subcutaneous and Intradermal Injections
- Subcutaneous injections deliver medication into the fatty tissue between the skin and muscle, providing slower, more sustained absorption compared to IM injections. Common sites include the abdomen, upper arms, thighs, and upper back.
- Intradermal injections place medication just under the epidermis, primarily used for allergy testing and TB skin tests. The preferred site is the inner forearm or upper back.
Comparison of Injection Techniques
| Feature |
Intradermal |
Subcutaneous |
Intramuscular |
| Needle angle |
10-15 degrees |
45-90 degrees |
90 degrees |
| Needle size |
26-27G, 3/8-5/8" |
25-27G, 3/8-5/8" |
20-23G, 1-1.5" |
| Volume limit |
0.1-0.2 mL |
0.5-1 mL |
2-3 mL (site dependent) |
| Absorption rate |
Very slow |
Slow to moderate |
Faster than SubQ |
Key Points
- For SubQ injections, pinch skin for thin patients, but use flat technique for obese patients
- Rotate insulin injection sites systematically to prevent lipohypertrophy
- For intradermal injections, a successful administration creates a visible wheal or bleb
Topical, Transdermal, and Mucosal Administration
- Topical medications are applied directly to the skin or mucous membranes for local or systemic effects. Transdermal medications are specially formulated to be absorbed through the skin for systemic effects.
- Mucosal administration includes ophthalmic (eye), otic (ear), nasal, rectal, and vaginal routes, each requiring specific techniques to ensure proper delivery and minimize contamination.
Memory Aid: Eye Drop Administration
Remember "CREST" for eye medication administration:
Clean from inner to outer canthus
Rest hand on patient's forehead for stability
Expose lower conjunctival sac by pulling down on lower lid
Squeeze drop into conjunctival sac (not directly on cornea)
Tissue to absorb excess (no pressure on lacrimal duct)
ALERT: When applying transdermal patches, always remove the previous patch, clean the area, and rotate sites to prevent skin irritation. Document date, time, and location of application.
Key Points
- For transdermal patches, apply to clean, dry, hairless skin with good circulation
- When administering eye drops, wait 5 minutes between different eye medications
- For rectal suppositories, insert beyond the internal sphincter and against the rectal wall
Commonly Confused Medications and Routes
Commonly Confused Concepts
| Concept |
Definition |
Common Errors |
| IV Push vs. IV Bolus |
Both refer to direct administration of medication into the vein, but bolus implies rapid administration |
Administering a medication too quickly that requires slow IV push |
| Subcutaneous vs. Intradermal |
SubQ goes into fatty tissue; intradermal is just below skin surface |
Incorrect angle of insertion leading to wrong tissue layer |
| Ventrogluteal vs. Dorsogluteal |
Different anatomical locations in gluteal region |
Using dorsogluteal site (higher risk) instead of safer ventrogluteal |
| Enteric-coated vs. Extended-release |
Enteric coating protects from stomach acid; extended-release provides gradual drug release |
Crushing or splitting tablets that should remain intact |
Clinical Case: A nurse is preparing to administer heparin 5,000 units subcutaneously to a patient. The nurse correctly selects a 25G 5/8" needle, cleanses the abdomen site with alcohol, pinches the skin, inserts the needle at a 45-degree angle, and does not aspirate before injecting the medication. After injection, the nurse does not massage the site to prevent bruising.
Key Points
- Never substitute routes of administration without a provider's order
- Verify that the medication is formulated for the intended route
- Some medications have different dosages based on administration route
Study Tips for Medication Administration
- Focus on understanding the principles behind each route rather than memorizing isolated facts. Knowing why certain medications are given via specific routes will help you apply knowledge to new situations on the NCLEX.
- Practice medication calculations regularly, especially for weight-based dosing, IV drip rates, and pediatric medications. The NCLEX frequently tests calculation skills in the context of safe medication administration.
Memory Aid: The Six Rights of Medication Administration
Remember the traditional "Six Rights":
1. Right Patient
2. Right Drug
3. Right Dose
4. Right Route
5. Right Time
6. Right Documentation
Additional rights include: Right reason, Right assessment, Right education, Right evaluation, and Right to refuse
Key Points
- Create flashcards for medication routes and their appropriate uses, contraindications, and nursing considerations
- Practice identifying appropriate injection sites on anatomical diagrams
- Review high-alert medications and their specific administration requirements
Quick Check: Test Your Knowledge
1. What is the maximum volume typically administered in the deltoid muscle for an adult?
2. Which injection technique is used to prevent tracking of irritating medications through subcutaneous tissue?
3. When administering eye drops and eye ointment to the same eye, which should be administered first?
4. What angle is used for intradermal injections?
5. Why is the ventrogluteal site preferred over the dorsogluteal site for IM injections?
Common Pitfalls
- Not verifying patient allergies before medication administration
- Failing to check compatibility when administering multiple IV medications
- Using incorrect needle size or length for the selected route and patient
- Not properly documenting medication administration, including site rotation
- Crushing medications that should not be crushed (extended-release, enteric-coated)
Self-Assessment Checklist