Dosage Calculation and Safe Medication Practice

Basics of Safe Medication Administration

• Foundational Concepts

  • Medication administration is a core nursing responsibility entwined with legal, ethical, and technical expectations.
  • Goal: deliver the correct medication, to the correct patient, at the correct time, via the correct route, in the correct dose, and document it correctly (the “Six Rights”).
  • Safety frameworks emphasise continuous quality improvement (CQI) and the avoidance of preventable harm.

• Objectives of the Session

  • Examine nurse responsibilities, acceptable practice standards, and prescription components.
  • Review the five-step Nursing Process and the six-step Clinical Judgment Model.
  • Identify common medication errors and strategies for risk reduction.
  • Locate evidence-based tools/organizations that support safe practice.
  • Recognise and manage adverse drug reactions (ADRs).

Nurse Responsibilities & Medication Knowledge

• Preparation & Administration
  • Accurately calculate dosages, prepare medications, and employ sterile/aseptic technique when indicated.
• Patient Assessment
  • Current medication list, OTCs, herbals, supplements.
  • Drug–drug, drug–food, and drug–disease interactions.
  • Allergy history (including type of reaction, e.g., anaphylaxis vs rash).
  • Relevant physical findings (vital signs, lab values, organ function).
• Required Medication Knowledge
  • Purpose & therapeutic classification.
  • Mechanism of action (MOA).
  • Recommended route(s) of administration.
  • Safe dosage range; be able to convert units (e.g., $1\,\text{g}=1000\,\text{mg}$).
  • Expected side effects vs adverse effects vs toxic effects.
  • Precautions & contraindications.
  • Antidotes when applicable.
• Technical Skill Set
  • Proper use of syringes, IV pumps, infusion controllers, barcode scanners, automated dispensing cabinets (ADCs).

Legal Implications

• Nurse Practice Act (state specific)
  • Defines RN scope of practice; violation → negligence or malpractice charges.
• Federal Law: Controlled Substances Act
  • Requires secure storage, strict inventory counts, and two-nurse witnessing for waste of Schedule II opioids, etc.
• Mandatory Reporting
  • Medication errors → institutional incident report + internal quality review.
  • Some states require external reporting for sentinel events to patient-safety organizations.

Six Rights of Medication Administration

1. Right Patient
2. Right Medication
3. Right Dose
4. Right Route
5. Right Time
6. Right Documentation

• Extensions (sometimes called the 7th–10th rights) include Right Indication, Right Education, Right to Refuse, and Right Assessment/Evaluation.

Types & Components of Prescriptions

• Routine (Standing) – carried out until a specified stop date or cancelled.
• Single/One-time – administered once at a specified time.
• STAT – give immediately, often within $5\text{ min}$ of order.
• Now – less urgent than STAT; typically within $90\text{ min}$.
• PRN – “as needed,” must include indication (e.g., pain >6/10).

Prescription Components (example: Metformin)

• Patient identifiers: name, DOB, address, phone.
• Date & time order written.
• Drug name (generic preferred), strength: $500\,\text{mg}$.
• Dose form & total quantity: “1 tab PO BID #60.”
• Route: PO.
• Frequency & duration.
• Provider signature & credentials; DEA # for controlled substances.
• Substitution permission (“Dispense as written” vs generic substitution).

Nursing Process & Clinical Judgment

• Traditional Nursing Process (RN)

  1. Assessment
  2. Analysis/Diagnosis
  3. Planning
  4. Implementation
  5. Evaluation

• Practical Nurse (PN) Variation

  • Data collection, planning, implementation, evaluation (analysis done by RN).

• Clinical Judgment Measurement Model (NCLEX-NGN)

  1. Recognize cues
  2. Analyze cues
  3. Prioritize hypotheses
  4. Generate solutions
  5. Take action
  6. Evaluate outcomes

Medication Errors

Common Categories

• Wrong medication/strength/IV fluid/dilution.
• Incorrect rate (IV drip, infusion pump).
• Wrong patient, route, or time.
• Omission (missed dose).
• Administration despite known allergy.

Root Causes (per ISMP)

• Similar drug names (LASA: look-alike/sound-alike).
• Calculation errors (decimal misplacement, confusion between $\text{mg}$ and $\mu\text{g}$).
• Distractions, fatigue, inadequate staffing.
• Poorly designed electronic alerts (“alert fatigue”).
• Ambiguous abbreviations (see “Do Not Use” list).

Continuous Quality Improvement (CQI) & Safety Organizations

• The Joint Commission (TJC) – sets National Patient Safety Goals (NPSGs).
• Institute for Safe Medication Practices (ISMP) – publishes error-prevention guidelines, tall-man lettering lists.
• Quality & Safety Education for Nurses (QSEN) – six core competencies (patient-centered care, teamwork, EBP, QI, safety, informatics).
• Institute of Medicine (IOM) – landmark reports “To Err Is Human” & “Crossing the Quality Chasm.”

Risk-Reduction Technologies

• Electronic Medical/Health Records (EMR/EHR)
  • Real-time access to orders, labs, allergy alerts.
• Computerized Provider Order Entry (CPOE) with Clinical Decision Support (CDS).
• Barcode Medication Administration (BCMA).
• Automated Medication Dispensing Cabinets (ADC)
  • Require user ID/password or biometric scan; track retrieval, decrease diversion, transparency for audits.

Medication Reconciliation

• Joint Commission mandate for all transitions of care (admission, transfer, discharge).
• Five Steps
  1. Develop a current, accurate list (name, dose, route, frequency, indication).
  2. Obtain orders for the new setting.
  3. Compare both lists; identify discrepancies (duplication, omission, dosing changes).
  4. Update list; communicate to pharmacist & prescriber.
  5. Educate patient & caregivers; repeat at every transition.

Clinical Importance

• Prevents therapeutic duplication, drug–drug interactions, and unintentional discontinuation of chronic meds (e.g., antihypertensives, insulin).

Error-Prone Abbreviations (“Do Not Use” List)

• QD vs QID, QOD—write “daily,” “every other day.”
• HS – clarify “bedtime” vs “half-strength.”
• DC – specify “discontinue” vs “discharge.”
• U, u – write “unit.”
• IU – write “international unit.”
• MS, MSO4 – write “morphine sulfate”; MgSO4 – “magnesium sulfate.”

Additional Safety Considerations

• LASA Medication Pairs & Tall-Man Lettering
  • buPROPion vs busPIRone
  • traZODone vs traMADol
• Decimal Placement Rules
  • Always include leading zero: $0.5$ mL not .5 mL.
  • Never use trailing zero: $5$ mL not 5.0 mL.
• High-Alert Medications (ISMP List)
  • Insulin, anticoagulants, opioids, chemotherapeutics, concentrated electrolytes (KCl), epidural infusions.
• Common Abbreviations – know & verify; institution policies override if stricter.

Adverse Drug Reactions (ADRs)

• Definition: any noxious, unintended, undesired effect at normal doses.
• Populations at Increased Risk
  • Older adults (polypharmacy, reduced renal/hepatic clearance).
  • Paediatrics (immature organ systems, weight-based dosing).
  • Individuals with multiple comorbidities or organ dysfunction.
• Nurse Role
  • Anticipate potential ADRs based on pharmacology.
  • Monitor vitals, labs (e.g., LFTs with statins, INR with warfarin).
  • Report voluntary ADRs to FDA MedWatch for post-marketing surveillance.

Strategies to Improve Client Safety

• Gather a complete medication history on admission; highlight allergies and previous ADRs.
• Perform medication reconciliation at every care transition.
• Conduct chart reviews before administration (labs, vitals, timing of previous doses).
• Understand indication, therapeutic effect, and major adverse effects before giving any drug.
• Anticipate withdrawal or rebound phenomena when discontinuing meds (e.g., $\beta$-blockers).
• Monitor & trend lab results (renal function with nephrotoxic drugs, peak/trough levels for antibiotics).

Study & Exam Preparation Tips

• Use session objectives as a study blueprint.
• Distribute study sessions daily (spaced repetition) rather than cramming.
• Focus on application (“action”) questions over rote memorization.
• Form study groups; teaching others solidifies learning (peer instruction).
• Employ microlearning during downtime (flashcards).
• Take periodic breaks to optimise cognitive performance (Pomodoro).

Exam Logistics (Exam 1)

• Seating: random assignment.
• Allowed items: laptop only; store bags, hats, jackets, smartwatches in lockers.
• Format: $45$ items in $60$ minutes.
  • Multiple choice, multiple response (select-all-that-apply), hot-spot.
  • No backtracking once item completed.
• Completion: show “green screen” to proctor, exit quietly; no hallway discussion.
• Academic integrity emphasised; faculty will perform item analysis and post grades.

Optional Study Hall

• Time: 1 – 2 p.m.
• Student-directed group study, medication BINGO game.
• Faculty present for content clarification.