Drugs to review with a falling GFR, and conquering pain in CKD

The Rest is Kidneys podcast series is brought to you by Imperial College Healthcare NHS Trust and North West London Integrated Care Board (NWL NHS)

This episode provides practical advice for primary care professionals on reviewing medications and prescribing pain relief for patients with CKD. The discussion focuses on assessing kidney function using estimated GFR (eGFR), adjusting drug dosages, and safely managing pain relief without compromising renal health. The hosts explain how eGFR should be used instead of creatinine clearance for drug dosing decisions, while taking into account patient-specific factors such as body size and muscle mass to ensure accurate assessment.

Key considerations for medication reviews are covered, including drugs that require caution such as NSAIDs, Metformin, PPIs, and cardiovascular medications. The importance of dose adjustments, monitoring for complications like hyperkalemia, and following Sick Day guidance to prevent adverse effects during acute illness is highlighted.

For pain management, the episode outlines safe options for analgesics, including paracetamol, tramadol, and opioids like fentanyl and oxycodone, while stressing the need to avoid morphine due to the risk of metabolite accumulation and toxicity. Recommendations are provided for starting with low doses and titrating carefully, particularly for neuropathic pain treatments such as Gabapentin and Pregabalin.

Take-Home Messages:

1. Kidney Function Assessment – Use estimated GFR (eGFR) rather than creatinine clearance for drug dose adjustments, considering patient-specific factors like muscle mass.
2. Medication Reviews – Avoid regular NSAIDs, adjust Metformin dosing (reduce below eGFR 45, stop below 30), review PPIs and cardiovascular drugs, and follow Sick Day rules to guide temporary medication pauses during illness.
3. Pain Management – Use paracetamol as first-line analgesia, avoid morphine, and opt for lower doses of tramadol, oxycodone, or fentanyl for stronger pain relief. Minimise long-term NSAID use and review topical gels due to absorption risks.

This episode offers clear, NICE-aligned guidance to support safer prescribing practices in CKD.

Resource Links:
NICE GUIDELINES [NG203] chronic kidney disease: assessment and management Overview | Chronic kidney disease: assessment and management | Guidance | NICE

Northwest London CKD guidelines for primary care Chronic kidney disease (nwlondonicb.nhs.uk)

The purpose of this podcast is to inform and educate health care professionals working in the primary care and community setting. The content is evidence based and consistent with NICE guidelines and North West Guidelines available at the time of publication.

The content of this podcast does not constitute medical advice and it is not intended to function as a substitute for a healthcare practitioner’s judgement.

Produced by award-winning media and marketing specialist Heather Pownall of Heather's Media Hub

Chapters

• 0:37 What should be considered during a medication review for patients with CKD, particularly regarding the use of painkillers and assessing kidney function for drug dose adjustments, should creatinine clearance or estimated GFR be used?
• 4:09 If I was in primary care and reviewing a patient's drug list, what should I focus on when reviewing medications for a patient with CKD?
• 12:27 What can primary care use for people with CKD?
• 15:38 Episode summary