Oxidation of reduced haloperidol to haloperidol: involvement of human P450IID6 (sparteine/debrisoquine monooxygenase).

Abstract:

:1. The conversion of haloperidol (HAL) to reduced haloperidol (RHAL) and then back to HAL has been established in vivo and observed in psychiatric patients. The reduction of HAL to RHAL is known to be catalysed by a ketone reductase, while the nature of oxidation back to HAL is the subject of the present study. 2. We examined the in vitro oxidation of RHAL to HAL in human livers. The activity was microsomal and evidence is presented to suggest that the sparteine/debrisoquine metabolizing isoenzyme P450IID6 contributes to this oxidation. 3. Reciprocal inhibition studies between RHAL and sparteine, a specific substrate for cytochrome P450IID6, indicated that both compounds compete for the same binding site. Quinidine, the most specific inhibitor for this cytochrome P450 potently inhibited the oxidative conversion of reduced haloperidol to haloperidol. A significant correlation (rs = 0.62, P less than 0.01) was found between RHAL oxidation and sparteine oxidation in a study involving 17 human liver samples.

journal_name

Br J Clin Pharmacol

authors

Tyndale RF,Kalow W,Inaba T

doi

10.1111/j.1365-2125.1991.tb05588.x

subject

Has Abstract

pub_date

1991-06-01 00:00:00

pages

655-60

issue

6

eissn

0306-5251

issn

1365-2125

journal_volume

31

pub_type

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