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Polypharmacy & Deprescribing for MRCP Part 1: Criteria and Principles

TL;DR: 

Polypharmacy and deprescribing are high-yield topics for MRCP Part 1, especially in geriatrics and general medicine. The exam tests principles—recognising drug-related harm, using structured criteria (Beers, STOPP/START), and knowing when to rationalise therapy. This clinician-written guide covers what to learn, common traps, a mini-case, and a practical revision checklist.


Why this matters for MRCP Part 1

Polypharmacy—often defined as the use of five or more medications—is common in older adults and patients with multimorbidity. In MRCP Part 1, questions rarely ask you to count drugs; instead, they test whether you can identify inappropriate prescribing, anticipate adverse drug reactions (ADRs), and apply safe deprescribing principles.

These questions appear across geriatrics, cardiology, endocrinology, psychiatry, and general medicine. Typical stems describe falls, delirium, postural hypotension, renal injury, or bleeding where the correct answer is to review medications rather than pursue more tests.

For syllabus context and how this fits into the wider exam blueprint, see the official MRCP Part 1 overview:👉 https://www.mrcpuk.org/mrcpuk-examinations/part-1


Scope of polypharmacy in the exam

Examiners commonly frame polypharmacy in three settings:

  1. Older adults and frailty – falls, confusion, functional decline

  2. Multimorbidity – accumulation of guideline-driven therapies

  3. Adverse drug reactions – renal, cognitive, cardiovascular, or bleeding complications

Key exam principle: Polypharmacy is not inherently wrong. Appropriate polypharmacy (e.g. evidence-based secondary prevention after myocardial infarction) is often correct. Problematic polypharmacy causes harm without proportional benefit.


High-yield principles you must know

1. Appropriateness matters more than numbers

Eight well-indicated drugs may be appropriate; three interacting sedatives may not be. MRCP questions reward this reasoning.

2. Older adults are most vulnerable

Reduced renal clearance, altered hepatic metabolism, and increased CNS sensitivity make ADRs more likely—particularly with sedatives and antihypertensives.

3. ADRs are common and under-recognised

Drug-related problems account for a significant proportion of hospital admissions in older adults. In exam stems, unexplained deterioration should prompt a medication review.

4. Deprescribing is an active process

It involves reviewing current benefit versus future harm, considering life expectancy, goals of care, and patient preference—not simply “stopping drugs”.

5. Beers Criteria: potentially inappropriate medicines

The Beers Criteria list drugs that often do more harm than good in older adults (e.g. long-acting benzodiazepines). For the exam, know the concept, not the full list. Authoritative source:👉 https://www.americangeriatrics.org/beers-criteria

6. STOPP/START criteria: European focus

  • STOPP (Screening Tool of Older Persons’ Prescriptions): what to stop

  • START (Screening Tool to Alert to Right Treatment): what is missing

MRCP Part 1 favours understanding the framework rather than memorisation. Original criteria overview:👉 https://academic.oup.com/ageing/article/44/2/213/2812238

7. Drug–disease interactions are exam favourites

Classic examples include:

  • NSAIDs in chronic kidney disease or heart failure

  • Anticholinergics in dementia

  • Benzodiazepines in falls or delirium

8. Preventive drugs may become low-value

Statins, bisphosphonates, or tight glycaemic control may be inappropriate in patients with limited life expectancy.

9. Prescribing cascades are commonly tested

A side effect is misinterpreted as a new disease and treated with another drug—worsening polypharmacy.

10. Patient-centred goals matter

Quality of life and function often outweigh long-term prevention in frail patients.

Five most tested subtopics

  1. Falls and postural hypotension – antihypertensives, diuretics, tricyclics

  2. Delirium and cognitive impairment – benzodiazepines, anticholinergics, opioids

  3. Renal impairment – NSAIDs, ACE inhibitors + diuretics (“triple whammy”)

  4. Bleeding risk – anticoagulants + antiplatelets ± NSAIDs

  5. Prescribing cascades – calcium-channel blocker → ankle oedema → diuretic


Quick comparison table (exam memory aid)

Concept

Polypharmacy

Deprescribing

Core idea

Multiple concurrent drugs

Structured reduction of drugs

Exam focus

Appropriateness & harm

Safety & patient goals

Typical setting

Older adults, multimorbidity

Frailty, limited life expectancy

Key tools

Beers, STOPP/START

Medication review

Common stem

Falls, confusion, AKI

Rationalising treatment

Doctor revising pharmacology and geriatrics topics for MRCP Part 1

Mini-case (MRCP style)

Stem: An 82-year-old woman presents after two falls. She is confused and dizzy on standing. eGFR is 38 mL/min. Medications include amlodipine, bendroflumethiazide, diazepam, oxybutynin, and ibuprofen as required. CT head is normal.

Best next step? Review and rationalise medications.

Explanation: This presentation strongly suggests drug-related harm. Benzodiazepines and anticholinergics increase fall and delirium risk; NSAIDs worsen renal function. The exam tests whether you prioritise medication review over further investigation once red flags are excluded.


Common pitfalls (exam traps)

  • Assuming polypharmacy is always inappropriate

  • Ordering investigations before reviewing medications

  • Ignoring anticholinergic burden

  • Missing prescribing cascades

  • Rigidly following guidelines without considering frailty


Practical study-tip checklist

  • ✔ Ask: Could this symptom be drug-related?

  • ✔ Associate falls + confusion with medications first

  • ✔ Beers = “potentially inappropriate”, not absolutely contraindicated

  • ✔ STOPP = what to stop; START = what is missing

  • ✔ In frailty, prioritise symptoms and function

  • ✔ Practise mixed-stem questions regularly

For exam-standard practice, use a dedicated MRCP question bank such as the Crack Medicine Qbank:👉 https://crackmedicine.com/qbank/

Once comfortable, test progress under exam conditions with a full mock test:👉 https://crackmedicine.com/mock-tests/


FAQs

What is the definition of polypharmacy in MRCP Part 1?

Classically five or more drugs, but the exam focuses on appropriateness and harm rather than a strict number.

Are Beers criteria tested in detail?

No. You should understand the principle—that some drugs are often inappropriate in older adults—rather than memorising lists.

Is deprescribing the same as stopping all medications?

No. It is a structured, patient-centred process to reduce harm while preserving benefit.

Which patients are most at risk from polypharmacy?

Older adults, those with frailty, renal impairment, cognitive decline, or multiple comorbidities.


Ready to start?

If you want to turn concepts like polypharmacy and deprescribing into guaranteed marks, don’t stop at reading.


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