The demethylation of amitriptyline: a cross-over study of steady-state plasma levels of amitriptyline and nortriptyline in depressed patients.

Abstract:

:Five elderly depressed patients were treated with amitriptyline (AT) and nortriptyline (NT) in turn, in a cross-over design. Steady-state plasma drug levels were compared with those calculated for eight healthy subjects of previous single-dose studies. Plasma clearances were on average about 2.5 times lower in the patients than the healthy subjects, but the ratios of the different reaction rates did not differ significantly between the two groups. The interpretation of the ratio of NT levels during AT treatment and NT treatment, in terms of the fraction of AT that is metabolised by demethylation, is discussed. The ratio of NT level to AT level during AT treatment was particularly variable between individuals. This was apparently due to independent variation in (a) the ratio of plasma clearances of AT and NT and (b) the fraction of AT metabolised to NT.

journal_title

Psychopharmacology

authors

Burch JE

doi

10.1007/BF00436164

subject

Has Abstract

pub_date

1983-01-01 00:00:00

pages

254-8

issue

3

eissn

0033-3158

issn

1432-2072

journal_volume

80

pub_type

临床试验,杂志文章,随机对照试验
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