Abstract | AIMS: METHODS: Twelve patients with a diagnosis of active brain parenchymal neurocysticercosis treated with albendazole for 8 days (15 mg kg(-1) day(-1)) were investigated. On day 8, serial blood samples were collected during the dose interval (0-12 h) and one CSF sample was taken from each patient by lumbar puncture at different time points up to 12 h after the last albendazole dose. Albendazole metabolites were determined in CSF and plasma samples by h.p.l.c. using a Chiralpak AD column and fluorescence detection. Population curves for CSF albendazole metabolite concentration vs time were constructed. RESULTS: The mean plasma/CSF ratios were 2.6 (95% CI: 1.9, 3.3) for (+)-ASOX and 2.7 (95% CI: 1.8, 3.7) for (-)-ASOX, with the two-tailed P value of 0.9873 being non-significant. These data indicate that the transport of ASOX through the blood-brain barrier is not enantioselective, but rather depends on passive diffusion. The present results suggest the accumulation of the (+)-ASOX metabolite in the CSF of patients with neurocysticercosis. The CSF AUC(+)/AUC(-) ratio was 3.4 for patients receiving albendazole every 12 h. The elimination half-life of both ASOX enantiomers in CSF was 2.5 h. ASOX was the predominant metabolite in the CSF compared with ASON; the CSF AUC(ASOX)/AUC(ASON) ratio was approximately 20 and the elimination half-life of ASON in CSF was 2.6 h. CONCLUSIONS: We have demonstrated accumulation of the (+)-ASOX metabolite in CSF, which was about three times greater than the (-) antipode. ASOX concentrations were approximately 20 times higher than those observed for the ASON metabolite.
|
Authors | O M Takayanagui, P S Bonato, S A C Dreossi, V L Lanchote |
Journal | British journal of clinical pharmacology
(Br J Clin Pharmacol)
Vol. 54
Issue 2
Pg. 125-30
(Aug 2002)
ISSN: 0306-5251 [Print] England |
PMID | 12207631
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
|
Chemical References |
- Anthelmintics
- albendazole sulfone
- Albendazole
- albendazole sulfoxide
|
Topics |
- Adult
- Albendazole
(analogs & derivatives, cerebrospinal fluid, metabolism, pharmacokinetics, therapeutic use)
- Anthelmintics
(cerebrospinal fluid, pharmacokinetics, therapeutic use)
- Brain Diseases
(cerebrospinal fluid, drug therapy, metabolism)
- Female
- Humans
- Male
- Middle Aged
- Neurocysticercosis
(cerebrospinal fluid, drug therapy, metabolism)
- Stereoisomerism
|