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Drug dosing guidelines in patients with renal failure
1Division of Nephrology, Hypertension and Clinical Pharmacology, Oregon Health Sciences University, Portland 97201.
The Western Journal of Medicine
|June 1, 1992
Summary
Adjusting drug dosages for patients with impaired kidney function is crucial to prevent accumulation and toxicity. A systematic approach considering glomerular filtration rate and altered pharmacokinetics ensures safe and effective medication therapy.
Area of Science:
- Pharmacology
- Nephrology
- Clinical Pharmacy
Background:
- Drug metabolism and excretion heavily rely on normal renal function.
- Impaired renal function necessitates careful drug dosage adjustments to prevent accumulation and toxicity.
- Uremic conditions in advanced renal disease can lead to adverse drug effects even for non-renal eliminated drugs.
Framework:
- A systematic approach to drug dosage adjustment in renal impairment is essential.
- Key steps include calculating glomerular filtration rate (GFR), administering loading doses, and determining maintenance doses.
- Monitoring drug concentrations is vital for optimizing therapy and avoiding toxicity.
Implementation:
- Physicians should avoid overreliance on nomograms and "cookbook" equations for dosage adjustments.
- Considerations include altered pharmacokinetics (bioavailability, protein binding, hepatic biotransformation, volume of distribution) in renal disease.
- Awareness of accumulating active or toxic metabolites in reduced GFR is necessary.
Implications:
- Proper drug therapy in renal patients achieves desired pharmacologic effects while minimizing toxicity.
- Understanding the impact of dialysis on drug elimination is critical for patients on renal replacement therapy.
- Individualized dosage adjustments are paramount for safe and effective pharmacotherapy in renal disease.