Related Experiment Videos
Nalidixic acid kinetics in renal insufficiency
British Journal of Clinical Pharmacology
|October 1, 1982
Summary
Renal insufficiency affects nalidixic acid (NA) metabolism, decreasing 7-hydroxy (HNA) elimination and increasing 7-carboxy (CNA) plasma levels. Standard NA dosing may be suitable for mild renal impairment.
Area of Science:
- Pharmacokinetics
- Drug Metabolism
- Renal Physiology
Background:
- Nalidixic acid (NA) is an antibacterial agent.
- Understanding NA pharmacokinetics in renal insufficiency is crucial for safe dosing.
- Metabolites 7-hydroxy (HNA) and 7-carboxy (CNA) are key to NA's disposition.
Purpose of the Study:
- To investigate the impact of varying renal function on NA and its metabolite excretion and biotransformation.
- To determine if standard NA dosage is appropriate for patients with impaired kidney function.
Main Methods:
- Pharmacokinetic analysis of NA, HNA, and CNA in plasma and urine.
- Study conducted in 23 patients with diverse renal function levels.
- Single oral administration of NA.
Main Results:
- Renal insufficiency minimally impacted NA renal clearance.
- Significantly reduced elimination rate of HNA observed in patients with renal insufficiency.
- CNA, undetectable in normal renal function, appeared in plasma with impaired function, correlating positively with creatinine levels.
- Urinary CNA increased with greater renal impairment, suggesting kidney biotransformation of HNA to CNA.
Conclusions:
- Impaired kidneys may transform HNA into CNA.
- CNA accumulation in plasma is likely due to reduced urinary excretion and potential back-diffusion.
- Standard nalidixic acid dosage appears safe for patients with mild renal insufficiency.