Medication Safety and Administration Vocabulary

Drug Nomenclature and Classifications

• Chemical Name: Provides an exact description of the drug's chemical and molecular structure.

• Generic Name: Assigned by the United States Adopted Names Council (USAN Council) when the developing manufacturer is ready to market the drug. It is the official nonproprietary name.

• Official Name: The generic name as listed in official publications, such as the United States Pharmacopeia and National Formulary (USP-NF).

• Brand Name: The trade or proprietary name under which the drug is sold in commercial stores.

• Prescription Drugs: Require a written prescription or order from an authorized healthcare provider.

• Nonprescription Drugs: Also known as over-the-counter (OTC) medications; can be purchased without a prescription and are considered safe for the general population when consumer instructions are followed.

• Drug Classifications: Grouped based on:

  • Clinical Use: The intended purpose or therapeutic outcome of the drug.

  • Body System: The organ or physiological system targeted by the medication.

  • Pharmacological Class: The chemical category or specific mechanism of action.

Mechanisms to Promote Drug Safety and Legal Considerations

• Mechanisms to Promote Drug Safety:

  • Pharmacopoeia and Formularies: Official listings of approved drugs and standards.

  • Nursing Drug Handbooks: Quick clinical references for administration parameters and safety warnings.

  • Physician's Desk Reference (PDR): Comprehensive reference compiled by drug manufacturers.

  • Pharmacology Texts: Fundamental academic sources detailing mechanisms and kinetics.

  • Digital Formularies: Electronic health record (EHR) integrated tools for real-time reference.

  • Clinical Pharmacists: Key interprofessional team members available for drug consultations and dosage verification.

  • Medication Package Inserts: Detailed product information approved by regulatory bodies.

  • Institutional Medication Policies and Procedures: Facility-specific guidelines designed to standardise safe administration.

• Legal Considerations:

  • Nurse Practice Acts: State regulations that define nursing responsibilities regarding medication administration and client monitoring.

  • U.S. Drug Legislation: Regulates the manufacture and sale of medications; establishes official drug standards; defines prescription drug categories; regulates controlled substances; mandates proof of efficacy; and continually works to improve safety standards.

Medication Storage and Distribution Systems

• Stock Supply:

  • Stored in bulk quantities in a central location.

  • Medications are not client-specific and require individual measurement prior to administration.

• Unit Dose System:

  • Medications are individually packaged in single doses.

  • Stored in client-specific drawers in a locked medication cart.

  • Typically supplied in a $24\text{-hr}$ supply for each patient.

• Automated Dispensing System:

  • Examples include Pyxis, Omnicell, and Diebold.

  • Password-accessible locked cart integrated with electronic health records.

  • Provides computerized tracking of inventory and withdrawal times.

  • Can combine stock supply and unit dose items efficiently.

• Self-Administration Medication (SAM) System:

  • Individual containers kept directly at the client's bedside.

  • Allows clients to self-administer specific medications while maintaining independence under monitoring.

Pharmacokinetics

• Overview: Pharmacokinetics refers to what happens to the drug inside the body. It consists of four primary processes: Absorption, Distribution, Metabolism, and Excretion (ADME).

• Absorption:

  • Definition: The movement of a drug from its site of administration into the bloodstream.

  • Bioavailability: The subfraction of administered drug that reaches systemic circulation in an active form.

  • Factors Affecting Absorption: Route of administration, drug solubility, pH/ionization, and localized blood flow.

• Distribution:

  • Definition: The transport of a drug within systemic blood flow to target tissues and organs.

  • Factors Affecting Distribution: Local blood flow, membrane permeability (e.g., blood-brain barrier), and protein-binding capacity.

  • Clinical Correlation (Low-Protein Diet): A client on a low-protein diet may experience impaired drug distribution due to inadequate levels of plasma proteins (such as albumin). Lower plasma protein levels mean fewer binding sites, resulting in an increased level of "free" (unbound, active) drug in the bloodstream, which increases the risk of drug toxicity.

• Metabolism (Biotransformation):

  • Definition: The chemical conversion of the drug into an inactive or water-soluble compound.

  • Primary Location: Primarily occurs in the liver.

  • First-Pass Effect: Oral medications pass from the GI tract through the portal vein into the liver, where a significant portion of the active drug may be metabolized before entering systemic circulation.

  • Factors Affecting Metabolism: Liver function, overall health/disease status, and the first-pass effect.

• Excretion:

  • Definition: The elimination of drug metabolites or unchanged drug from the body.

  • Primary Organs: Kidneys (main organ of excretion), liver, and lungs.

  • Exocrine Glands involved in excretion:

    • Salivary glands: Secrete saliva into the mouth.

    • Sweat glands: Release sweat onto the skin.

    • Sebaceous glands: Secrete oil into hair follicles.

    • Mammary glands: Produce milk that exits through ducts (important consideration for lactating patients).

    • Exocrine pancreas: Secretes digestive enzymes into the small intestine.

• Pharmacokinetic Parameters of Drug Action:

  • Onset: The time required for drug concentration to reach a sufficient blood level for its therapeutic effects to appear.

  • Peak Level: The highest concentration of the drug reached in the blood.

  • Duration of Action: The length of time the drug continues to exert a pharmacological effect.

  • Therapeutic Range: The range of drug concentration in the blood that is safe and produces the desired therapeutic effect without toxicity.

  • Trough Level: The lowest concentration of the drug in the blood, measured immediately (usually $30\text{-min}$ or right before) prior to the next scheduled dose.

  • Biological Half-Life: The time required for half ($50\%$) of the drug concentration to be eliminated from the body.

  • Concentration of Active Drug at Target Sites: The net amount of active drug molecule reaching target cell receptors or organs.

• Factors Affecting Pharmacokinetics Globally:

  • Age, body mass (weight), sex, pregnancy, environmental conditions, route of administration, timing of administration, fluid intake, pathological states, genetic factors, and psychological factors.

Pharmacodynamics and Drug Effects

• Overview: Pharmacodynamics refers to how the drug affects the body, including mechanism of action and cellular interaction.

• Primary Effects (Therapeutic Effects):

  • The predicted, intended, and desired response for which the drug was prescribed.

  • Palliative Effect: Relieves symptoms without curing the disease (e.g., pain medication for cancer pain).

  • Supportive Effect: Helps the body keep functioning until other treatments take effect (e.g., IV fluids for dehydration).

  • Substitutive Effect: Replaces something the body is missing or lacking (e.g., insulin for diabetes).

  • Chemotherapeutic Effect: Kills or inhibits disease-causing cells or organisms (e.g., antibiotics kill bacteria; chemotherapy destroys cancer cells).

  • Restorative Effect: Helps the body return to or maintain optimal health (e.g., vitamin supplements to correct a deficiency).

• Secondary Effects:

  • Unintended and nontherapeutic responses that can be predictable, harmless, or harmful.

  • Side Effect: An expected, secondary effect that occurs at therapeutic doses (e.g., drowsiness from diphenhydramine).

  • Adverse Reaction: An unexpected, harmful, and unintended reaction to a drug (e.g., severe bleeding from an anticoagulant).

  • Toxic Reaction: Dangerous, damaging effects to organs or tissues caused by excessive drug levels in the body (e.g., digoxin toxicity causing severe nausea and bradycardia/arrhythmias).

  • Allergic Reaction: An immune system reaction to a drug acting as an antigen (e.g., rash, hives, or life-threatening anaphylaxis from penicillin).

  • Idiosyncratic Reaction: An unexpected, unusual, or opposite reaction unique to an individual patient (e.g., agitation caused by a sedative).

  • Cumulative Effect: Increased response to a drug when rate of administration exceeds rate of metabolism/excretion, causing drug buildup.

• Summary Table of Primary vs. Secondary Effects:

• Drug Interactions:

*   *Antagonistic Interaction:* One drug reduces or blocks the effect of another drug (e.g., Naloxone reverses opioid effects). *Nursing Tip:* Monitor the patient as the expected effect may be decreased or lost.
*   *Synergistic Interaction:* Two drugs work together to produce a stronger combined effect than either drug alone (e.g., Alcohol combined with sedatives greatly increases drowsiness and respiratory depression). *Nursing Tip:* Watch for exaggerated effects and adverse reactions.
*   *Incompatibilities:* Two drugs react chemically and should not be mixed together in the same solution or IV line because they become ineffective or precipitate. *Nursing Tip:* Verify compatibility prior to mixing; use separate IV lines if incompatible.
*   *Interactions with Food:* Food can increase, decrease, or alter drug absorption or action (e.g., Grapefruit juice increases the bioavailability/effects of certain medications). *Nursing Tip:* Educate patients regarding food-drug interactions and assess dietary/supplement intake.

Drug Tolerance, Dependence, Misuse, Abuse, and Illicit Drugs

• Drug Tolerance: The body becomes accustomed to a drug over time, making it less effective and requiring higher doses to achieve the original effect (e.g., a patient taking opioids for chronic pain requiring dose escalation).

• Drug Dependence: The body physically adapts to the drug; stopping the medication suddenly triggers physiological withdrawal symptoms such as anxiety, sweating, nausea, tremors, and irritability.

• Drug Misuse: Using a prescribed medication incorrectly or inconsistently, even if not explicitly intended to cause self-harm (e.g., taking extra doses to feel better, taking medication more frequently, or taking someone else's prescription).

• Drug Abuse: The intentional, non-medical use of a substance to alter consciousness, produce pleasure, or achieve a high; a form of substance use disorder with high overdose risk.

• Illicit Drugs: Illegal substances prohibited by law due to high potential for harm and addiction (e.g., heroin, cocaine, methamphetamine, LSD, ecstasy, marijuana under federal classification).

• Nursing Considerations:

  • Assess substance use history and identify risk factors nonjudgmentally.

  • Monitor patients for clinical signs of tolerance, physical dependence, and withdrawal.

  • Provide explicit safe-use education and reinforce prescription adherence.

  • Provide supportive resources and follow institutional reporting protocols.

Measurement Systems, Calculations, and Prescriptions

• Measurement Systems in Healthcare:

1.  *Metric System:* The primary system used in modern healthcare (e.g., milligram [$\text{mg}$], gram [$\text{g}$], milliliter [$\text{mL}$], liter [$\text{L}$], kilogram [$\text{kg}$]).
2.  *Apothecary System:* An older system rarely used today (e.g., grain [$\text{gr}$], dram [$\text{dr}$]).
3.  *Household System:* Everyday home measures used by patients (e.g., teaspoon [$\text{tsp}$], tablespoon [$\text{tbsp}$], cup).
4.  *Units (U):* Standardized measure used for specific biological medications, notably insulin (e.g., Insulin $10\,\text{units}$).
5.  *Milliequivalents (mEq):* Used to measure electrolyte concentrations (e.g., Potassium $20\,\text{mEq}$).

• Common Equivalents and Conversions:

  • $1\,\text{teaspoon (tsp)} = 5\,\text{mL}$

  • $1\,\text{tablespoon (tbsp)} = 15\,\text{mL}$

  • $1\,\text{ounce (oz)} = 30\,\text{mL}$

  • $1\,\text{cup} = 240\,\text{mL}\ (8\,\text{oz})$

  • $1000\,\text{mg} = 1\,\text{g}$

  • $1000\,\text{mL} = 1\,\text{L}$

  • $1000\,\text{mcg} = 1\,\text{mg}$

• Dosage Calculation Methods: Ratios and proportions, solving for X, dosage nomograms, and Clark's rule.

• The Joint Commission "Do Not Use" Abbreviation List:

*   *U or u:* Write "unit"
*   *IU:* Write "international unit"
*   *Q.D., QD, q.d., qd:* Write "daily"
*   *Q.O.D., QOD, q.o.d., qod:* Write "every other day"
*   *MS, MSO4, MgSO4:* Write "morphine sulfate" or "magnesium sulfate"
*   *Trailing zero ($X.0\,\text{mg}$):* Do not use trailing zeros; write "$X\,\text{mg}$" (e.g., $10\,\text{mg}$)
*   *Lack of leading zero ($.X\,\text{mg}$):* Always use a leading zero; write "$0.X\,\text{mg}$" (e.g., $0.1\,\text{mg}$)
*   *Other TJC recommendations:* Write out "greater than" or "less than" instead of $>$ or $<$; write full drug names; use metric units; write "at" or "each" instead of $@$; write "$\text{mL}$" instead of "$\text{cc}$"; write "$\text{mcg}$" instead of "$\mu\text{g}$".

• Essential Components of a Medication Prescription:

  • Client's full name (and address if legally required).

  • Date and time the prescription was written.

  • Name of the medication.

  • Dosage size, frequency, and total number of doses.

  • Route of administration.

  • Printed name, signature, credentials, and DEA number (for controlled substances) of the prescriber.

• Types of Medication Prescriptions:

1.  *Written Prescription:* Standard order written or electronically entered by a provider (e.g., Tylenol $650\,\text{mg}$ PO every $6\,\text{hours}$).
2.  *Automatic Stop Date:* Order automatically discontinued after a specified time frame unless explicitly renewed (e.g., Amoxicillin $500\,\text{mg}$ PO every $8\,\text{hours}$ x $7\,\text{days}$).
3.  *STAT Prescription:* Medication must be administered IMMEDIATELY due to urgency (e.g., Epinephrine $0.3\,\text{mg}$ IM STAT).
4.  *Single (One-Time) Prescription:* Given once only at a specified time (e.g., Lorazepam $1\,\text{mg}$ PO once before MRI).
5.  *Standing Prescription:* Administered routinely on a scheduled basis until altered or stopped (e.g., Lisinopril $10\,\text{mg}$ PO daily).
6.  *PRN Prescription:* Administered as needed based on specified clinical parameters (e.g., Acetaminophen $650\,\text{mg}$ PO every $6\,\text{hours}$ PRN pain).

• Prescription Communication Guidelines:

  • Written/Electronic: Preferred method to minimize errors. Read and verify completely prior to administration.

  • Verbal Prescriptions: Given directly in person. The nurse writes the order, signs it with the provider's name and nurse's credentials, repeats it back, and spells the drug name.

  • Telephone Prescriptions: Given over the phone. Must be repeated/read back verbatim. Provider must co-sign within $24\,\text{hours}$.

• Clinical Safety Principles Regarding Unclear Orders:

  • Never guess what a prescription says.

  • Never administer a medication based on another nurse's interpretation of an illegible or unclear order.

  • If a provider refuses clarification, escalate immediately through the nursing chain of command to protect patient safety.

Medication Errors and Prevention Strategies

• Causes of Medication Errors: Similar drug names (look-alike/sound-alike), lack of drug/patient knowledge, wrong route, illegible handwriting, incorrect transcription, calculation/measurement errors, equipment malfunction/improper use, improper handling, lack of patient identity verification, and nurse fatigue.

• Errors in the Medication Cycle:

*   *Ordering Phase:* Accounts for $39\%$ of errors. Common errors include wrong dose, wrong drug, wrong route/form, drug-allergy/interaction oversights.
*   *Transcribing Phase:* Errors in transcribing route, dose, patient, time, or drug.
*   *Dispensing Phase:* Primary catch point for allergies/interactions. Errors include wrong dose, route, patient, time, labeling omissions.
*   *Administering Phase:* True error rate is $20\%$ (Intercept rate $19\%$). Common errors: wrong patient, wrong dose, wrong drug, wrong time/omitted, wrong route; frequently involves infusion pump setup.

• Error-Prevention Technology:

  • Computerized Physician Order Entry (CPOE): Prevents handwriting illegibility and auto-checks for allergies and interactions.

  • Barcode Medication Administration (BCMA): Scans patient wristband and medication package to verify matches.

  • Smart Pumps: Infusion pumps built with dose-error reduction systems (limits and alarms).

  • Automated Dispensing Cabinets (ADCs): Electronically controlled medication storage drawers.

• Nursing Protocol Following a Medication Error:

  1. Immediately assess the patient's vital signs and clinical status.

  2. Report findings immediately to the primary care provider.

  3. Notify the nurse manager.

  4. Complete an agency-specific incident/occurrence report per facility policy.

The Nursing Process in Medication Safety

• Assessment:

  • Before Administration: Vital signs, physical status, lab values, baseline assessment, contraindications.

  • During Administration: Mental status, swallowing capability, coordination, patient positioning.

  • After Administration: Therapeutic response, side effects, adverse reactions, toxicity.

  • Medication History: Drug allergies, current prescription and OTC regimens, herbal supplements, pregnancy/lactation status, capability to afford/obtain medications.

• Nursing Diagnoses: Risk for injury (related to polypharmacy, misuse, or side effects); Nonadherence to medication regimen.

• Patient Teaching for Self-Administration: Educate on drug name/purpose, proper schedule/dosing, potential side effects, safe storage, avoiding abrupt discontinuation, and maintaining supply.

• The Three Safeguard Checks:

  1. Check One (Before Pouring): Check medication label against the MAR upon removing from supply.

  2. Check Two (After Preparing): Verify the label against the MAR after preparing or drawing up the dose.

  3. Check Three (At the Bedside): Check the medication label against the MAR at the bedside right before administration.

• The Rights of Medication Administration:

*   *6 Core Rights:* Right Drug, Right Patient (use 2 identifiers: name, DOB; never room number), Right Dose, Right Route, Right Time, Right Documentation.
*   *10 Expanded Rights:* Includes Right Time & Frequency, Right Response, Right to Refuse, Right Education, Right Reason.

Oral and Enteral Medication Administration

• Oral Medications:

  • Most common, least expensive, and convenient route.

  • Forms include tablets, capsules, liquids, sublingual, and buccal.

  • Liquid Administration: Use calibrated cups or oral syringes. Hold bottle with label facing the palm to avoid liquid running onto and smudging the label. Read liquid level at the bottom of the meniscus at eye level on a flat surface.

  • Sublingual & Buccal: Absorbed through mucosal membranes directly into systemic circulation (bypasses liver first-pass). Sublingual goes under tongue; buccal goes between cheek and gum.

• Enteral Administration (NGT, G-Tube, J-Tube):

  • Nasogastric Tube (NGT): Inserted via nose to stomach (adult tubes typically $90\text{-}100\,\text{cm}$ long).

  • Gastrostomy Tube (G-Tube): Surgical placement directly into stomach.

  • Jejunostomy Tube (J-Tube): Surgical placement directly into jejunum.

  • Special Precautions:

    • Do NOT administer hydrophilic medications (e.g., Metamucil) via tube as they attract water and clog the tube.

    • Do NOT crush enteric-coated or extended-release (XR/XL/SR) tablets.

    • Flush tube with water before, between, and after medication administration.

    • If attached to suction, clamp the tube for at least $30\,\text{minutes}$ post-administration to permit drug absorption.

• Special Oral Considerations:

  • Teeth Discoloration: Administer liquid iron or stain-causing meds through a straw and flush with water.

  • Objectionable Taste: Have patient suck on ice chips prior to administration to numb taste buds; offer fluids/juice after.

  • Contraindications: Patients who are NPO, comatose, experiencing severe nausea/vomiting, or at risk for aspiration.

Topical, Mucosal, and Respiratory Medication Administration

• Topical Applications:

  • Applied directly to skin or mucous membranes (lotions, creams, ointments, transdermal patches).

  • Assess skin integrity before applying. Use gloves, wooden applicators, or cotton swabs so the medication does not touch the nurse's skin.

  • Transdermal Patches: Delivers constant, controlled drug release over prolonged periods ($24\,\text{hours}$ or more). Rotate sites; clean old site; wear gloves during removal/application; never cut patches unless specified.

• Instillations and Irrigations:

  • Ophthalmic (Eye): Marked "for ophthalmic use only". Pull lower eyelid down to expose conjunctival sac; place drop in sac without touching tip to eye/eyelashes. Never place directly on cornea.

  • Otic (Ear): Administer at room temperature (cold solutions cause vertigo/nausea). Use clean technique unless eardrum is ruptured or surgical procedure was performed.

  • Nasal: Used mainly for decongestion. Caution against prolonged use to avoid rebound congestion; use saline drops in children.

  • Vaginal: Suppositories, creams, foams, douches. Provide perineal pad afterward; store suppositories refrigerated.

  • Rectal: Suppositories or liquid enemas. Bypasses first-pass liver metabolism. Macy catheter can be inserted in rectum for continuous/intermittent administration up to $28\,\text{days}$.

• Respiratory Inhalations:

  • Administered via nebulizers, Metered-Dose Inhalers (MDI), or Dry Powder Inhalers (DPI) for rapid alveolar absorption.

Parenteral Medication Administration

• Overview: Injected into body tissues or bloodstream (ID, SQ, IM, IV). Requires strict aseptic technique because skin barrier is broken.

• Equipment:

*   *Needle Gauge:* Inverse relationship—smaller gauge number indicates a larger needle diameter.
    *   $25\text{-}30\,\text{G}$: Fine gauge; used for SQ/ID, causes less pain.
    *   $14\text{-}18\,\text{G}$: Large gauge; used for blood transfusion, viscous meds, or rapid IV infusion.
*   *Needle Length:* Ranges from $\frac{3}{8}\text{''}$ to $3\text{''}$. Typical IM length is $1\frac{1}{2}\text{''}$; ID/SQ is $\frac{3}{8}\text{''}$ to $\frac{3}{4}\text{''}$.
*   *Bevel:* Slanted tip of needle. Long bevels for SQ/IM; short bevels for ID/IV.
*   *Filter Needles:* Required when drawing medication from glass ampules to trap glass fragments.

• Preparation Sources:

  • Ampules: Sealed glass containers holding a single dose. Snap top away from body; use a filter needle to draw drug.

  • Vials: Glass/plastic containers with rubber stoppers. Must inject equal volume of air before drawing solution.

  • Powder Reconstitution: Adding a liquid diluent (sterile water/saline) to powdered drug.

  • Mixing Two Medications: Only mix if compatible, given by same route, and total volume is safe.

• Comparison Table of Parenteral Routes:

• Intramuscular Injection Sites:

  • Ventrogluteal Site: Preferred IM site for adults and walking children. Free of major blood vessels/nerves. Tolerates up to $3\text{-}5\,\text{mL}$.

*   *Deltoid Site:* Located on upper arm ($2\text{-}3$ fingerbreadths below acromion process). Small muscle mass; maximum volume $0.5\text{-}1\,\text{mL}$. Avoid in infants.

*   *Vastus Lateralis Site:* Anterolateral thigh. Preferred site for infants/young children before walking age. Accommodates larger fluid volumes than deltoid.

• Insulin Administration & Categories:

  • Administered SQ or IV only; measured strictly in U-100 Units.

  • Rapid-Acting: Onset $15\,\text{min}$ before meals (Humalog, Lispro, Apidra).

  • Short-Acting: Onset $30\,\text{min}$ before meals (Novolin R).

  • Intermediate-Acting: Half-day coverage (NPH).

  • Long-Acting: All-day coverage (Lantus, Basaglar).

  • Combination: Pre-mixed fast-acting and long-acting insulin.

Documentation Protocols

• Document immediately AFTER administration, never before.

• Record medication name, dose, route, exact time given, and nurse signature/credentials.

• For PRN medications, document clinical rationale and patient response evaluated after administration.

• For parenteral routes, document the specific injection site used.

• Fundamental Rule: If it wasn't documented, it wasn't done.

Comprehensive Concept Map Overview

• Pharmacokinetics: ADME processes dictating drug concentration at active target sites.

• Pharmacodynamics: Receptor interactions yielding primary therapeutic or secondary adverse/toxic/allergic effects.

• Administration Safeguards: Blending 3 checks, 6 rights (expanding to 10), and error-prevention technology (CPOE, BCMA, Smart Pumps).

• Nursing Responsibilities: Continuous assessment (before, during, after), accurate calculations, legal compliance with Nurse Practice Acts, and thorough documentation.