Polypharmacy management

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Polypharmacy - More Pills, More Problems

  • Definition: Concurrent use of ≥5 medications, especially common in patients aged >65.
  • Core Risks: Exponential ↑ in adverse outcomes with each added drug.
    • Adverse Drug Reactions (ADRs) & Drug-Drug Interactions (DDIs).
    • ↓ Adherence due to complex regimens.
    • Geriatric syndromes: ↑ risk of falls, confusion, frailty.
    • Prescribing Cascade: Treating a side effect with another drug.

Elderly man overwhelmed by multiple medications

⭐ A classic prescribing cascade: A calcium channel blocker causes peripheral edema, which is misdiagnosed as heart failure and treated with a diuretic.

  • Management Tool: 📌 Beers Criteria helps identify Potentially Inappropriate Medications (PIMs) in the elderly.

Screening Tools - Spotting Risky Regimens

  • Beers Criteria:

    • Gold-standard list of Potentially Inappropriate Medications (PIMs) to avoid in adults ≥65 years.
    • Focuses on drugs where risks often outweigh benefits due to age-related physiological changes.
    • Key targets: Anticholinergics, Benzodiazepines, long-term NSAIDs.
    • 📌 Mnemonic: BEERS = Be Extremely Eware of Risky Scripts.
  • STOPP/START Criteria:

    • STOPP: Screening Tool of Older People's Prescriptions. Identifies common, preventable instances of inappropriate prescribing.
    • START: Screening Tool to Alert to Right Treatment. Identifies prescribing omissions (e.g., no statin for secondary prevention).

⭐ The Beers Criteria are not absolute contraindications but guidelines to prompt a risk/benefit discussion for a specific patient.

Beers Criteria for Potentially Inappropriate Medications

Deprescribing - The Art of Subtraction

Deprescribing is the planned, supervised process of dose reduction or cessation of medications that may be causing harm or are no longer providing benefit. The goal is to reduce polypharmacy and improve patient outcomes.

  • Process: A systematic approach involving patient and caregiver collaboration.
  • Key Considerations:
    • Align with patient goals and preferences.
    • One medication at a time to assess effects.
    • Tapering is often necessary for drugs with withdrawal potential (e.g., benzodiazepines, opioids, beta-blockers, SSRIs).

High-Yield: Deprescribing can halt a "prescribing cascade," where an adverse drug effect is misdiagnosed as a new medical condition, leading to another prescription.

Common Culprits - High-Risk Interactions

  • Serotonin Syndrome:
    • Trigger: SSRIs/SNRIs + MAOIs, triptans, linezolid.
    • Effect: Altered mental status, autonomic hyperactivity, neuromuscular abnormalities.
  • Hyperkalemia:
    • Trigger: ACE Inhibitors/ARBs + Spironolactone, K+ supplements, NSAIDs.
    • Effect: Life-threatening cardiac arrhythmias.
  • Bleeding:
    • Trigger: Warfarin + NSAIDs, Amiodarone, Fluconazole (CYP inhibitors).
    • Effect: ↑ INR, significant hemorrhage risk.
  • QT Prolongation / Torsades de Pointes:
    • Trigger: Macrolides/Fluoroquinolones + Antipsychotics, certain antiarrhythmics.
    • Effect: Ventricular tachycardia.
  • Digoxin Toxicity:
    • Trigger: Digoxin + Verapamil, Amiodarone (↓ clearance).
    • Effect: Nausea, vision changes, bradycardia.

⭐ Combining ACE inhibitors with potassium-sparing diuretics (e.g., spironolactone) is a classic cause of severe hyperkalemia, especially in patients with underlying CKD.

High‑Yield Points - ⚡ Biggest Takeaways

  • Polypharmacy (≥5 drugs) disproportionately affects the elderly, significantly increasing the risk of adverse drug events (ADEs) and non-adherence.
  • Watch for the prescribing cascade: an ADE is misinterpreted as a new medical condition, leading to another prescription.
  • Medication reconciliation at every transition of care is the most effective preventive strategy.
  • Utilize Beers Criteria and STOPP/START criteria to identify and discontinue potentially inappropriate medications in older adults.
  • Deprescribing-the supervised withdrawal of inappropriate medications-is a key management goal.

Practice Questions: Polypharmacy management

Test your understanding with these related questions

A 75 year-old gentleman presents to his general practitioner. He is currently being treated for hypertension and is on a multi-drug regimen. His current blood pressure is 180/100. The physician would like to begin treatment with minoxidil or hydralazine. Which of the following side effects is associated with administration of these drugs?

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Flashcards: Polypharmacy management

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One adverse effect associated with digoxin is _____ (HR)

TAP TO REVEAL ANSWER

One adverse effect associated with digoxin is _____ (HR)

bradycardia

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