Medication administration

In short

Medication administration is the nursing act of giving a prescribed drug to a patient by the correct route in the correct dose at the correct time, with assessment before and evaluation after. The nurse is the last barrier before a drug reaches the patient, so she or he carries legal and professional accountability for checking the order, calculating the dose and documenting it. In Indian B.Sc Nursing, this is a heavily weighted unit of Fundamentals of Nursing and Pharmacology, with practical examination on injection technique and dosage calculation. Campus interviews for Apollo, Fortis, Max, Manipal, AIIMS, state health services and Gulf recruiters routinely test the ten rights, IV drip-rate arithmetic, insulin and heparin handling, and what to do after a medication error.

Explained

Terms, prescription and legal framework

• Drug / medication: a substance given to diagnose, treat, cure, relieve or prevent disease. Pharmacology is the study of drugs; pharmacokinetics is what the body does to the drug (absorption, distribution, metabolism, excretion); pharmacodynamics is what the drug does to the body (receptor action, dose-response).
• Nomenclature: *chemical name* (acetylsalicylic acid) → *generic name* (aspirin) → *brand/trade name* (Disprin). Indian practice and the National Medical Commission's prescribing guidance push generic names in prescriptions; nurses must transcribe generic names and recognise brand equivalents.
• Parts of a drug order: patient's name and ID, date and time, drug name, dose, route, frequency, special directions, and the prescriber's signature with registration number. An order missing any part is incomplete and must not be given until clarified.
• Types of orders: *standing* (regular, e.g. Tab Paracetamol 500 mg PO QID), *prn* (as needed, with a minimum interval), *stat* (at once, single dose), *single* (one time at a stated time), *telephone/verbal* (allowed only in emergency; read back, write down, get it countersigned, commonly within 24 hours per hospital policy).
• Indian legal basis: the Drugs and Cosmetics Act, 1940 and Rules, 1945 classify drugs into schedules — Schedule H and H1 (prescription-only; H1 covers certain antibiotics, anti-TB drugs and sedatives, needing a separate register kept for three years), Schedule X (strict stock and dispensing records), Schedule G, and Schedule J (claims not permitted). The Narcotic Drugs and Psychotropic Substances Act, 1985 governs opioids such as morphine — double-locked cupboard, two-nurse shift count, entry in the narcotic register, wastage witnessed and signed.
• Professional basis: the Indian Nursing Council curriculum and the National Nursing and Midwifery Commission Act, 2023 (which replaces the Indian Nursing Council Act, 1947 as its provisions are brought into force — transition is staged, so cite the Act by name rather than assuming full commencement) frame the nurse's scope. A nurse administers but does not prescribe, except where a government programme explicitly authorises standing protocols (e.g. certain ASHA/ANM and NP-CC roles).
• Quality and reporting: NABH standards (Medication Management chapter) require a hospital formulary, a "Do Not Use" abbreviation list, high-alert drug labelling and medication-error reporting. Adverse drug reactions go to the Pharmacovigilance Programme of India (PvPI), coordinated by IPC Ghaziabad, on the suspected-ADR reporting form.

The rights of medication administration

1. Right patient — verify with two identifiers (name and UHID/bed number plus wristband); never by bed number alone.
2. Right drug — compare the label with the order; beware LASA (look-alike sound-alike) pairs.
3. Right dose — recalculate; a second nurse independently checks insulin, heparin, digoxin, chemotherapy and paediatric doses.
4. Right route — oral, IM, IV, SC, ID, topical, inhalation, rectal, vaginal, ophthalmic, otic, nasal, sublingual, buccal, transdermal, epidural, intrathecal, nasogastric.
5. Right time — within the accepted window (commonly ±30 minutes of the scheduled time; antibiotics and anticonvulsants need strict spacing).
6. Right documentation — record immediately after giving, never before.
7. Right to refuse — the patient may refuse; explain, record the refusal and inform the prescriber.
8. Right assessment — the pre-check: pulse before digoxin, BP before antihypertensives, blood sugar before insulin, respiratory rate before opioids, serum potassium before KCl.
9. Right evaluation — check the therapeutic effect and side effects; pain score after analgesia, temperature after an antipyretic.
10. Right education — tell the patient the drug, purpose, expected effect and what to report.
11. Older texts list five or six rights; exams accept the expanded list of ten. Add the three checks of the label: before taking from the shelf, before pouring, and before returning/at the bedside.

Routes, techniques and equipment

• Oral (PO): cheapest, safest, self-administrable; slow onset, first-pass metabolism, unusable in vomiting, unconsciousness or NBM status. Enteric-coated and sustained-release tablets must not be crushed; scored tablets may be halved.
• Sublingual / buccal: rapid absorption bypassing the liver — glyceryl trinitrate for angina; do not swallow or drink immediately.
• Nasogastric/PEG: flush 15–30 mL water before and after; give liquid forms or crushed immediate-release tablets, one drug at a time; stop feed for drugs needing an empty stomach (e.g. phenytoin).
• Intradermal (ID): 0.1 mL into the dermis, 26–27 G, 10–15°, flexor forearm — Mantoux test, sensitivity testing; a wheal confirms correct placement.
• Subcutaneous (SC): up to 1–1.5 mL, 25–26 G, 45° (or 90° with a short insulin needle), sites: outer upper arm, abdomen (5 cm away from umbilicus), anterior thigh, upper back; rotate sites to prevent lipohypertrophy. Insulin and heparin are the classic SC drugs — do not aspirate or massage after heparin or insulin.
• Intramuscular (IM): 1–3 mL in adults (max 5 mL in gluteus for an adult; 1 mL in deltoid; 0.5–1 mL in infant vastus lateralis), 21–23 G, 90°. Sites: ventrogluteal (safest — no major nerves or vessels, identified with the palm on the greater trochanter, index finger on the anterior superior iliac spine and middle finger along the iliac crest, injecting into the "V" between the two fingers), vastus lateralis (site of choice for infants, and for intramuscular immunisation in infancy), deltoid (small volumes, adult vaccines), dorsogluteal (now avoided — sciatic nerve risk), rectus femoris. Z-track technique (pull skin laterally, inject, wait 10 seconds, withdraw, release) for irritant drugs such as iron dextran and promethazine.
• Intravenous (IV): fastest onset, 100% bioavailability, irreversible once given; forms — IV push/bolus, intermittent (piggyback/burette), continuous infusion. Cannula gauges: 14–16 G (trauma, blood, rapid resuscitation), 18 G (blood, surgery), 20 G (routine adult), 22 G (fragile veins, elderly), 24 G (neonates, paediatrics). Macrodrip sets deliver 10, 15 or 20 drops/mL depending on make — read the set's label; microdrip (paediatric burette) is 60 drops/mL.
• Inhalation: metered-dose inhaler with spacer, dry powder inhaler, nebuliser; rinse the mouth after inhaled steroids to prevent candidiasis.
• Topical/transdermal: apply with gloves, measure ointment in inches where prescribed, rotate patch sites, remove the old patch first.
• Instillation: eye drops into the lower conjunctival sac, ear drops at room temperature (pull the pinna up and back in adults, down and back in children under three), nasal drops with the head positioned for the sinus targeted.
• Never the nurse's independent route: intrathecal, epidural and intra-arterial drugs are physician-administered; the nurse monitors and manages the line.

Step-by-step procedure and safety systems

1. Verify the order against the medication administration record (MAR); clarify doubts with the prescriber.
2. Check allergies (wristband, chart) and the pre-administration assessment parameter.
3. Hand hygiene; assemble drug, diluent, syringe, needle, gloves, kidney tray, sharps container.
4. Check the drug label for name, strength, route, expiry date, clarity, particulate matter, colour change and leakage. Never use an unlabelled syringe.
5. Calculate and prepare the dose; one nurse prepares and administers her own medicine; independent double-check for high-alert drugs.
6. Identify the patient with two identifiers; explain the procedure and obtain cooperation; position and provide privacy.
7. Clean the site (centre outwards, 5 cm, allow alcohol to dry), administer by correct technique, do not recap needles, discard as per Bio-Medical Waste Management Rules, 2016 (as amended) — sharps in the translucent/white puncture-proof container, contaminated plastics (syringes without needles) in red, soiled cotton in yellow.
8. Stay with the patient for oral drugs until swallowed; observe for 15–30 minutes after a first-dose injection or antibiotic for anaphylaxis; keep adrenaline available.
9. Document drug, dose, route, site, time and signature; record refusals and omissions with reason.
10. Evaluate response and report adverse reactions.
11. High-alert medications: insulin, heparin and anticoagulants, concentrated KCl, opioids, chemotherapy, neuromuscular blockers, concentrated electrolytes, thrombolytics — stored separately, labelled, double-checked.
12. "Do Not Use" abbreviations: write "units" not U, "international units" not IU, "daily" not OD/QD, "every other day" not QOD, "morphine sulfate" not MS/MSO₄, and always a leading zero (0.5 mg) with no trailing zero (5 mg, not 5.0 mg).
13. Error management: assess and stabilise the patient first, inform the prescriber and nursing in-charge, document factually in the record, and file an incident report — a no-blame, systems-focused report; never alter or erase an entry.
14. Medication reconciliation at admission, transfer and discharge prevents duplication and omission; unit-dose dispensing and bar-code verification reduce errors in larger Indian corporate hospitals.

Factors affecting drug action and special groups

• Patient factors: age, weight and body surface area, sex, pregnancy and lactation, genetics, nutrition, hydration, renal and hepatic function, psychological state (placebo effect).
• Drug factors: dose, dosage form, route, timing with food, and drug interactions — synergism, antagonism, additive effect, potentiation; incompatibility (physical precipitate, chemical inactivation) in the same syringe or IV line.
• Response terms: therapeutic effect, side effect, adverse drug reaction, toxicity, allergy and anaphylaxis, idiosyncrasy, tolerance, dependence, cumulative effect.
• Paediatric: dose by weight (mg/kg) or body surface area; never by adult fractions in practice; use oral syringe or dropper, no "teaspoon" estimates; vastus lateralis for IM.
• Geriatric: reduced renal clearance and albumin, polypharmacy, swallowing difficulty, risk of falls with sedatives; start low, go slow.
• Pregnancy and lactation: avoid teratogens; time doses so that peak levels miss feeding where possible.
• Unconscious patient: no oral route; use IV/IM/NG/rectal and strict mouth care.

Key points

• Ten rights - patient, drug, dose, route, time, documentation, refusal, assessment, evaluation, education.
• Three checks - verify the label when taking, when preparing and at the bedside before giving.
• Documentation rule - record only after administration; signing in advance is falsification.
• Verbal order - emergency only; write it, read it back, get it countersigned per hospital policy.
• Ventrogluteal - safest adult IM site; vastus lateralis - site of choice for infants; dorsogluteal - avoid (sciatic nerve).
• Angles - ID 10–15°, SC 45° (or 90° short needle), IM 90°, IV 15–30°.
• Z-track - lateral skin displacement for irritant IM drugs (iron dextran, promethazine) to seal the needle track.
• No aspiration, no massage - after SC heparin and insulin; it causes bruising and alters absorption.
• Insulin syringe - 100 units/mL marked in units; draw clear (regular) before cloudy (NPH); the 1 mL syringe is never a substitute.
• Drop factor - 15 or 20 drops/mL for macrodrip adult sets, 60 drops/mL for microdrip/paediatric burette; read the pack.
• High-alert drugs - insulin, heparin, concentrated KCl, opioids, chemotherapy, neuromuscular blockers; independent double-check.
• Pre-checks - pulse before digoxin (hold if < 60/min in adults), BP before antihypertensives, RR before opioids, blood sugar before insulin.
• Schedules - H and H1 prescription-only with H1 register kept 3 years; X strict records; NDPS, 1985 for opioids with double lock and shift count.
• Never crush - enteric-coated, sustained-release and sublingual tablets; crushing causes dose dumping.
• Error response - patient first, inform prescriber, factual documentation, incident report, no erasing.
• ADR reporting - suspected-ADR form to PvPI through IPC Ghaziabad.
• Waste segregation - sharps in white puncture-proof container, syringe barrels red, soiled dressings yellow (BMW Rules, 2016).
• Abbreviations - write "units" not U, "daily" not OD; leading zero yes, trailing zero no.

Formulas and examples

Example 1 — Tablet dose. Order: Tab Amoxicillin 750 mg PO TDS. Stock: 500 mg tablets. Dose = (750 / 500) × 1 = 1.5 tablets per dose. The tablet must be scored and not enteric-coated; otherwise ask the prescriber for a 250 mg strength. Daily total = 750 × 3 = 2,250 mg.

Example 2 — Injection from a vial. Order: Inj Gentamicin 60 mg IM. Stock: 80 mg in 2 mL. Volume = (60 / 80) × 2 = 1.5 mL. Give IM 90° in the ventrogluteal site with a 23 G needle; check renal function and hearing, as gentamicin is nephrotoxic and ototoxic.

Example 3 — IV drip rate. Order: 1,000 mL Ringer's lactate over 8 hours; set drop factor 20 drops/mL.

• Time = 8 × 60 = 480 minutes.
• gtt/min = (1,000 × 20) / 480 = 20,000 / 480 = 41.7 ≈ 42 drops/min.
• Rate in mL/h = 1,000 / 8 = 125 mL/h.
• Cross-check with the shortcut for a 20-drop set: mL/h ÷ 3 = 125/3 ≈ 42 drops/min. ✔

Example 4 — Paediatric dose and syrup volume. A 14 kg child is ordered Paracetamol 15 mg/kg/dose QID. Syrup available: 250 mg per 5 mL.

• Dose = 15 × 14 = 210 mg per dose.
• Volume = (210 / 250) × 5 = 4.2 mL → 4.2 mL measured in an oral syringe.
• Daily total = 210 × 4 = 840 mg = 60 mg/kg/day, within the usual maximum of 60 mg/kg/day for a child — do not add another paracetamol-containing combination.

Example 5 — Insulin and a potassium infusion. (a) Order: Inj Human Actrapid 14 units SC before breakfast; stock U-100 (100 units/mL).

• Volume = 14 / 100 = 0.14 mL, drawn in a 100-unit insulin syringe up to the 14-unit mark (never a 1 mL tuberculin syringe).
• Check capillary blood glucose first; withhold and inform if < 70 mg/dL; rotate abdominal sites; no massage.

(b) Order: 40 mEq KCl in 1,000 mL NS over 10 hours. Stock ampoule: 20 mEq in 10 mL.

• Volume to add = (40 / 20) × 10 = 20 mL.
• Rate = 1,000 / 10 = 100 mL/h; KCl delivered = 40/10 = 4 mEq/h, within the usual peripheral ceiling of 10 mEq/h.
• Never give concentrated KCl as an IV push — it causes fatal cardiac arrest; mix thoroughly and label the bag.

Where it is used

• Hospital bedside nursing: staff nurse roles in Apollo, Fortis, Max, Manipal, Narayana, AIIMS and state medical college hospitals — MAR-based drug rounds, IV therapy, double-checking high-alert drugs under NABH medication-management audits.
• Critical care and emergency: ICU, CCU, dialysis and casualty nurses prepare infusions of noradrenaline, insulin, heparin and sedatives on syringe and volumetric pumps, where mL/h accuracy is life-critical.
• Paediatrics and neonatology: weight- and BSA-based dosing, microdrip burettes, oral syringes; also the Universal Immunisation Programme where ANMs give BCG (ID), measles-rubella (SC) and pentavalent (IM, vastus lateralis).
• Community and public health: ANMs and CHOs at sub-centres and Ayushman Arogya Mandirs give DOTS for TB under NTEP, iron-folic acid under Anaemia Mukt Bharat, and injectable contraceptives under standing protocols.
• Oncology and specialty: chemotherapy administration requires certified training, PPE, cytotoxic spill kits and cytotoxic waste disposal; dialysis and cath-lab nurses handle heparin and contrast.
• Non-bedside careers: clinical research coordinator, pharmacovigilance associate (ADR case processing for PvPI and industry), nurse educator, quality/NABH coordinator, and medical-coding or insurance roles that read drug charts.

Interview questions

• Q: What are the ten rights of medication administration? A: Right patient, drug, dose, route, time, documentation, right to refuse, assessment, evaluation and education — the nurse verifies each before and after giving the drug.
• Q: You get a telephone order for a stat drug — what do you do? A: Accept it only if the situation is an emergency and policy permits, write it down, read it back to the prescriber for confirmation, administer, document it as a telephone order and have it countersigned within the period set by hospital policy.
• Q: Which is the safest IM site in adults and why? A: The ventrogluteal site — it is free of major nerves and blood vessels, has a thick muscle mass and less subcutaneous fat, so absorption is reliable and sciatic nerve injury is avoided.
• Q: Why is the Z-track technique used? A: Displacing the skin laterally before injection seals the needle track when released, preventing an irritant drug such as iron dextran from leaking into subcutaneous tissue and staining or irritating it.
• Q: You are ordered 20 units of insulin but only a 1 mL syringe is available. What will you do? A: Not give it with that syringe — obtain a 100-unit insulin syringe, because unit markings prevent the conversion error; 20 units of U-100 insulin is only 0.2 mL and a mis-read would be a tenfold overdose.
• Q: Calculate the drops per minute for 500 mL normal saline over 4 hours with a 15 drops/mL set. A: (500 × 15) / 240 = 7,500/240 = about 31 drops per minute.
• Q: What will you check before giving digoxin and what makes you withhold it? A: Apical pulse for one full minute — withhold and inform the prescriber if it is below 60 beats/min in an adult, or if there are signs of toxicity such as nausea, visual disturbance or arrhythmia; also check serum potassium, as hypokalaemia worsens toxicity.
• Q: You realise you gave a drug to the wrong patient. What is your first action? A: Assess and stabilise that patient and inform the prescriber and nurse in-charge at once, then document the facts in the record and file an incident report — concealment, not the error, is the unforgivable act.
• Q: Can a sustained-release tablet be crushed for a patient with a nasogastric tube? A: No — crushing destroys the release mechanism and dumps the whole dose at once, risking toxicity; ask the prescriber for an immediate-release or liquid alternative.
• Q: How are narcotic drugs handled on your ward? A: Under the NDPS Act, 1985 — stored in a double-locked cupboard, counted and signed by the outgoing and incoming nurse each shift, each dose entered in the narcotic register with the balance, and any wastage discarded in front of a witness who co-signs.
• Q: Why should documentation never be done before administration? A: Because if the dose is then interrupted, refused or omitted, the record becomes false; it misleads the next nurse and can lead to a double dose, and falsified records carry legal liability.
• Q: How do you report a suspected adverse drug reaction in India? A: Stop or hold the drug, inform the prescriber, treat the reaction, record it in the chart and on the allergy band, and submit a suspected-ADR reporting form to the Pharmacovigilance Programme of India through the hospital's ADR monitoring centre coordinated by IPC Ghaziabad.

Common mistakes

• Identifying a patient by bed number or by calling the name across the ward instead of using two identifiers and the wristband.
• Dividing instead of multiplying in the dose formula, or mixing units — forgetting that 1 g = 1,000 mg and 1 L = 1,000 mL — and so being out by a factor of ten.
• Assuming every IV set is 15 drops/mL; the drop factor must be read off the pack, and the paediatric burette is 60 drops/mL.
• Using a 1 mL syringe for insulin, or massaging the site after heparin or insulin, which causes bruising and erratic absorption.
• Omitting the pre-administration assessment — giving an antihypertensive without checking BP, or insulin without a glucose reading.
• Signing the MAR before giving the drug, or hiding an error instead of reporting it; also recapping needles and dropping sharps in the red bag rather than the white puncture-proof container.
• In exams: listing only five rights, naming dorsogluteal as the preferred adult IM site, and quoting Clark's rule in kilograms when the formula uses pounds and a denominator of 150.

Related topics

Vital signs · Infection control and asepsis · Fluid and electrolyte balance · The nursing process · Pharmacology and dosage calculation · First aid and basic life support