PMID: 456400Apr 17, 1979

Human pharmacokinetics of nitrazepam: effect of age and diseases

European Journal of Clinical Pharmacology
L KangasE Syvälahti

Abstract

Plasma concentrations of nitrazepam were measured by gas-liquid chromatography in: young healthy volunteers, in geriatric and psychiatric patients and in epileptic children. The disposition of nitrazepam was described in terms of a two-compartment open model. After a single oral dose of nitrazepam 5 mg the most prominent differences between the experimental groups were in the beta-phase half-life mean 29 h in the young volunteers and 40 h in geriatric patients , and in the apparent volume of distribution during the beta-phase of 2.4 vs 4.8 1/kg. Total plasma clearance and the average steady state concentration in both groups were equal. The plasma level rose at a rate proportional to the beta-phase half-life, and so, they were achieved more rapidly in the young than in the old subjects (3.5 vs 7.5 d). No change in steady-state level or in the half-life of nitrazepam were found during long term treatment, which indicates lack of enzyme induction or inhibition. In 95% of the epileptic children with a good to fair clinical response, the plasma concentration of nitrazepam was 40-180 ng/ml (mean 114 ng/ml). As all of the patients were on combined antiepileptic therapy, no attempt was made to correlate plasma level with therapeutic r...Continue Reading

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Citations

Jan 1, 1985·European Journal of Clinical Pharmacology·K H MolzP Philipp
Jan 1, 1986·European Journal of Clinical Pharmacology·A SelenP G Welling
Jan 1, 1988·Pharmacology & Therapeutics·J Roberts, N Tumer
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