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

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)
- Identify all medications (including OTC, herbal)
- Assess indication for each drug-still valid?
- Check for drug-drug and drug-disease interactions
- Calculate anticholinergic burden (target ACB <3)
- Review adherence and patient understanding
- Optimize doses for renal/hepatic function
- Deprescribe where harm exceeds benefit
- 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 Domain | Action Required If | Intervention |
|---|---|---|
| Indication | No current evidence-based indication | Deprescribe with patient agreement |
| Effectiveness | Not achieving therapeutic goal | Optimize dose or switch agent |
| Safety | ACB ≥3 or high-risk combination | Substitute lower-risk alternative |
| Adherence | Missing >20% of doses | Simplify regimen, use compliance aids |
| Patient preference | Unwilling to continue | Shared 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 Class | Taper Duration | Monitoring |
|---|---|---|
| Benzodiazepines | 4-12 weeks (reduce 10-25% every 1-2 weeks) | Anxiety, insomnia, seizures |
| Beta-blockers | 1-2 weeks | HR, BP, angina symptoms |
| PPIs | Switch to H2RA for 2 weeks then stop | Rebound dyspepsia |
| SSRIs | 2-4 weeks | Discontinuation syndrome |
| Corticosteroids | Variable (>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