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Renal & Urinary System

Use of Drugs in Renal Failure / Impairment

Guidance on adjusting medication use and dosage in patients with impaired kidney function (Acute Kidney Injury or Chronic Kidney Disease) to prevent drug accumulation, toxicity, and further kidney damage.

Also known as: Drug Dosing in Kidney Disease

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Referral and warning signs

When to refer

Consult pharmacist or specialist (Nephrologist/Physician) for dosing advice in complex cases, severe renal impairment (e.g., GFR <15-30), patients on dialysis, or when using drugs with narrow therapeutic index.

Red flags

  • Prescribing a known nephrotoxin to patient with significantly impaired renal function
  • Signs of drug toxicity in patient with renal impairment
  • Rapid decline in renal function after starting a new drug

Signs and symptoms

  • Not applicable - This is a guidance topic, not a disease entity.

Risk factors

  • Pre-existing renal impairment (AKI or CKD)
  • Use of potentially nephrotoxic drugs
  • Use of drugs primarily eliminated by the kidneys
  • Polypharmacy
  • Older age
  • Dehydration
  • Concurrent illness (e.g., heart failure, liver disease)

Diagnosis

Clinical assessment

Requires assessment of patient's renal function (estimated GFR or creatinine clearance) and knowledge of the pharmacokinetic properties (especially route of elimination) and potential nephrotoxicity of prescribed medications.

Investigations

  • Serum Creatinine (to estimate GFR/CrCl)
  • Urine output (in AKI)
  • Drug information resources (pharmacopoeias, guidelines, databases) for dosing recommendations.

Diagnostic criteria

Need to prescribe medication to a patient with known or suspected renal impairment (GFR <60 ml/min or acute decline).

Management

Non-pharmacological management

  • Careful medication review: Identify all current medications (Rx, OTC, herbal).
  • Avoid unnecessary medications.
  • Consider non-pharmacological alternatives where appropriate.

Pharmacological treatment

  • General Principles:
  • - Assess Renal Function (eGFR/CrCl) before prescribing/dosing.
  • - Avoid Nephrotoxic Drugs whenever possible.
  • - Adjust Dosage for drugs eliminated renally (reduce dose or increase interval).
  • - Use therapeutic drug monitoring (TDM) if available for certain drugs (e.g., gentamicin, vancomycin).
  • - Consider loading doses (usually unchanged) for drugs requiring rapid effect, followed by adjusted maintenance doses.
  • - Review medication list regularly, especially if renal function changes.
  • Specific Drug Considerations (Based on UCG 7.1.3):
  • - Drugs Usually Safe (May still need caution in severe impairment): Doxycycline, Erythromycin, Benzylpenicillin (max 6g/day severe impairment), Phenytoin, Rifampicin.
  • - Drugs Requiring Dose Reduction / Increased Interval: ACE inhibitors (Captopril), Amoxicillin, Chloramphenicol (avoid severe impairment), Ciprofloxacin, Co-trimoxazole, Diazepam, Digoxin, Insulin, Isoniazid, Pethidine (avoid severe impairment), Phenobarbital, Propranolol.
  • - Drugs to AVOID (or use with extreme caution/specialist advice): NSAIDs (Aspirin, Ibuprofen, Indomethacin), Codeine, Ethambutol, Gentamicin (and other aminoglycosides), Metformin (esp. GFR<30), Nalidixic acid, Nitrofurantoin, Streptomycin, Tenofovir disoproxil fumarate (TDF - requires adjustment/avoidance at lower GFR, TAF preferred).
  • Life-Threatening Infections: Use normal initial doses of essential antibiotics (e.g., for meningitis), then adjust subsequent doses based on renal function and response.

Monitoring

Monitor renal function (Creatinine/eGFR) regularly when using potentially nephrotoxic drugs or adjusted doses. Monitor for drug efficacy and toxicity.

Complications

  • Drug toxicity due to accumulation
  • Further decline in renal function (drug-induced AKI or accelerated CKD progression)
  • Sub-therapeutic drug levels if dose reduced inappropriately
  • Electrolyte disturbances (e.g., hyperkalaemia with ACEi/ARBs/potassium-sparing diuretics)

Prevention

  • Know patient's renal function.
  • Use appropriate drug dosing resources.
  • Avoid nephrotoxins where possible.
  • Maintain adequate hydration.

Patient education

  • Importance of informing all healthcare providers about kidney condition.
  • Caution regarding OTC medications (especially NSAIDs) and herbal remedies.
  • Need for dose adjustments for certain medications.
  • Reporting any new symptoms or side effects.

Uganda-specific notes

Crucial guidance due to limited renal function testing and specialist access. Need high awareness of common drugs requiring adjustment (ARVs like TDF, anti-TB drugs like Ethambutol/Streptomycin, antibiotics like Gentamicin) and those to avoid (NSAIDs). Empirical adjustments often necessary.

References

  • Uganda Clinical Guidelines (UCG) 2023

    Chapter 7, Section 7.1.3

  • Practical Guidelines for Dispensing (MOH Uganda)

    2015 (or latest edition)

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