Effect of citalopram on plasma levels of oral theophylline.

Abstract:

BACKGROUND:Citalopram and theophylline may be prescribed together to treat patients with depression and asthmatic disease. Because theophylline has a low therapeutic index, small changes in plasma levels may result in therapeutic failure or adverse effects. Both citalopram and theophylline are metabolized by cytochrome P450 (CYP) isozymes. Theophylline is metabolized by CYP1A2; however, the extent to which citalopram interacts with this isozyme in vivo is not known. OBJECTIVE:This study was conducted to investigate whether citalopram alters plasma levels of oral theophylline. METHODS:In an open-label, multiple-dose study, healthy nonsmoking volunteers 18 to 45 years of age were administered a single oral dose of theophylline (300 mg) on day 1. Beginning on day 3, citalopram 40 mg was administered daily through day 24 to achieve steady-state plasma levels. On day 23 a single oral dose of theophylline 300 mg was coadministered with citalopram 40 mg. Fasting plasma levels of theophylline were measured on day 1 (in the absence of citalopram) and on day 23 (in the presence of steady-state plasma concentrations of citalopram) periodically for 36 hours. RESULTS:Thirteen subjects (8 men and 5 women) participated; all completed the study. One subject was not included in the pharmacokinetic calculations. Citalopram treatment had no effect on the pharmacokinetic characteristics of theophylline. CONCLUSIONS:Citalopram dosing to steady state did not inhibit or induce the metabolism of theophylline in this population of healthy volunteers. Dose adjustment of theophylline thus may not be necessary in patients receiving concurrent therapy with citalopram.

journal_name

Clin Ther

journal_title

Clinical therapeutics

authors

Møller SE,Larsen F,Pitsiu M,Rolan PE

doi

10.1016/s0149-2918(00)83047-7

subject

Has Abstract

pub_date

2000-12-01 00:00:00

pages

1494-501

issue

12

eissn

0149-2918

issn

1879-114X

pii

S0149-2918(00)83047-7

journal_volume

22

pub_type

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