Differences in Theophylline Clearance Between Patients With Chronic Hepatitis and Those With Liver Cirrhosis.

Abstract:

BACKGROUND:Theophylline, a xanthine derivative drug, is used for the treatment of respiratory diseases, such as asthma, and is primarily eliminated by hepatic metabolism. There is marked interindividual variability in theophylline clearance. Therefore, the aim of this study was to evaluate the influence of chronic hepatitis (CH), liver cirrhosis (LC), and other covariates on theophylline clearance by population pharmacokinetic (PPK) analysis. METHODS:The authors retrospectively obtained 496 trough concentrations of theophylline at steady state from 226 adult patients with bronchial asthma. The liver functions of the patients were classified into 3 categories: normal hepatic function, CH, and LC. The PPK analysis was performed using the NONMEM program. CH, LC, age, smoking status, coadministration of clarithromycin (CAM), and sex were considered as covariates that affected theophylline clearance. RESULTS:Theophylline clearance (CL/F per kg) was significantly influenced by CH, LC, smoking, and CAM. The final model of theophylline clearance was as follows: CL/F (L/h·kg) = 0.0484 × 1.40 × 0.861 × 0.889 × 0.557. Smoking is a well-known factor that markedly enhances CL/F through the induction of CYP1A enzymes, whereas CAM has been reported to inhibit CYP3A4. The final model for hepatic function showed that CL/F in CH and LC patients was 0.043 and 0.027 L/h/kg, respectively, and it was lower than that in patients with normal hepatic function. As theophylline clearance depends on intrinsic hepatic clearance, lower CL/F in patients with LC than in those with CH may be due to a decrease in the metabolic enzymatic capability of LC patients. CONCLUSIONS:Differences exist in theophylline clearance between CH and LC patients as per the PPK analysis.

journal_name

Ther Drug Monit

authors

Kurata Y,Muraki S,Kashihara Y,Hirota T,Araki H,Ieiri I

doi

10.1097/FTD.0000000000000787

subject

Has Abstract

pub_date

2020-12-01 00:00:00

pages

829-834

issue

6

eissn

0163-4356

issn

1536-3694

pii

00007691-202012000-00004

journal_volume

42

pub_type

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