Polypharmacy

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Quick Overview

Polypharmacy (≥5 regular medications) affects 10-20% of UK adults, rising to >50% in those aged >65 years. Problematic polypharmacy occurs when medications cause harm through drug interactions, adverse effects, or prescribing cascades. NICE NG56 emphasizes structured medication review to optimize appropriate polypharmacy while minimizing harm, particularly in frail elderly patients.

Core Facts & Concepts

Definitions & Thresholds

  • Polypharmacy: ≥5 regular medications
  • Hyper-polypharmacy: ≥10 regular medications
  • Problematic polypharmacy: Medication use causing harm outweighing benefit
  • Appropriate polypharmacy: Evidence-based prescribing for multiple conditions

Anticholinergic Burden Scale (ACB)

  • Score 1 (mild): Codeine, furosemide, ranitidine
  • Score 2 (moderate): Carbamazepine, loperamide
  • Score 3 (severe): Amitriptyline, oxybutynin, hyoscine
  • Total ACB ≥3: Associated with 50% increased risk of falls, cognitive impairment, mortality

![Anticholinergic Burden Scale showing scoring system with medication examples and associated risks](Image: anticholinergic burden scale)

High-Risk Medications in Elderly (STOPP/START Criteria)

  • NSAIDs: Increase bleeding risk 4-fold with anticoagulants
  • Benzodiazepines: Falls risk increased 1.5-fold
  • Tricyclic antidepressants: ACB score 3, cardiac conduction effects
  • Antipsychotics: Stroke risk doubled in dementia patients
  • PPIs: Long-term use (>8 weeks) without indication-C. difficile risk

Prescribing Cascades

  • Metoclopramide → parkinsonism → levodopa prescribed
  • Thiazide diuretic → gout → NSAIDs prescribed
  • NSAID → hypertension → additional antihypertensive added
  • Cholinesterase inhibitor → urinary incontinence → anticholinergic prescribed

Problem-Solving Approach

Structured Medication Review (NICE NG56)

  1. Identify all medications (including OTC, herbal)
  2. Assess indication for each drug-still valid?
  3. Check for drug-drug and drug-disease interactions
  4. Calculate anticholinergic burden (target ACB <3)
  5. Review adherence and patient understanding
  6. Optimize doses for renal/hepatic function
  7. Deprescribe where harm exceeds benefit
  8. Monitor for 4-8 weeks post-changes

Red Flags 🚩

  • New confusion/falls in patient on ≥5 medications
  • ACB score ≥3 with cognitive symptoms
  • eGFR <30 ml/min without dose adjustments
  • Triple whammy: NSAID + ACEi + diuretic
  • Duplicate therapy (e.g., 2 benzodiazepines)

Deprescribing Priorities

  • Medications without clear indication
  • Drugs treating side effects of other drugs
  • Medications with ACB score ≥2
  • Drugs exceeding treatment duration (e.g., PPIs >8 weeks)
  • Medications with narrow therapeutic index in frail patients

⚠️ Warning: Never stop medications abruptly-taper benzodiazepines, beta-blockers, SSRIs, corticosteroids over weeks

Analysis Framework

Medication Review Decision Tool

Assessment DomainAction Required IfIntervention
IndicationNo current evidence-based indicationDeprescribe with patient agreement
EffectivenessNot achieving therapeutic goalOptimize dose or switch agent
SafetyACB ≥3 or high-risk combinationSubstitute lower-risk alternative
AdherenceMissing >20% of dosesSimplify regimen, use compliance aids
Patient preferenceUnwilling to continueShared decision to stop/reduce

Drug Interaction Risk Stratification

  • High risk: Warfarin + NSAID, SSRI + NSAID (bleeding)
  • Moderate risk: ACEi + spironolactone (hyperkalaemia)
  • Pharmacodynamic: Beta-blocker + verapamil (bradycardia)
  • Pharmacokinetic: Clarithromycin + simvastatin (rhabdomyolysis)

Visual Aid

Deprescribing Taper Guide

Drug ClassTaper DurationMonitoring
Benzodiazepines4-12 weeks (reduce 10-25% every 1-2 weeks)Anxiety, insomnia, seizures
Beta-blockers1-2 weeksHR, BP, angina symptoms
PPIsSwitch to H2RA for 2 weeks then stopRebound dyspepsia
SSRIs2-4 weeksDiscontinuation syndrome
CorticosteroidsVariable (>3 weeks use)Adrenal insufficiency

Key Points Summary

Polypharmacy ≥5 drugs; problematic when harm exceeds benefit-affects >50% of patients >65 years

Anticholinergic Burden (ACB) ≥3 increases falls risk 1.5-fold, cognitive impairment, and mortality by 50%

STOPP/START criteria identify inappropriate prescribing-NSAIDs, benzodiazepines, TCAs highest risk in elderly

Prescribing cascades occur when side effects are treated with additional drugs (e.g., metoclopramide → parkinsonism → levodopa)

Structured medication review (NICE NG56): Assess indication, effectiveness, safety, adherence-deprescribe where appropriate

Never stop abruptly: Taper benzodiazepines (4-12 weeks), beta-blockers (1-2 weeks), SSRIs (2-4 weeks), corticosteroids

Triple whammy (NSAID + ACEi + diuretic) causes AKI-avoid in elderly and monitor renal function closely

Practice Questions: Polypharmacy

Test your understanding with these related questions

During a practice audit of patients over 75 years taking 10 or more regular medications, you identify several patients who would benefit from structured medication reviews. You are prioritising which patients to review first based on risk stratification. According to best practice guidance on medication reviews in primary care, which patient characteristic indicates HIGHEST priority for urgent structured medication review?

1 of 5

Flashcards: Polypharmacy

1/10

With a ABPM/HBPM >=135/85 (stage 1 hypertension) treat if _____ AND any of the following: target organ damage established cardiovascular disease renal disease diabetes 10-year cardiovascular risk >10%

TAP TO REVEAL ANSWER

With a ABPM/HBPM >=135/85 (stage 1 hypertension) treat if _____ AND any of the following: target organ damage established cardiovascular disease renal disease diabetes 10-year cardiovascular risk >10%

<80 years

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