Dose-response evaluation of the antisecretory effect of continuous infusion intravenous lansoprazole regimens over 48 h.

Abstract:

BACKGROUND:Attainment of intragastric pH < 6.0 may require high-dose continuously infused proton pump therapy. AIM:To assess the pharmacokinetic and pharmacodynamic dose-responses of continuous infusion regimens of lansoprazole. METHODS:Healthy adult subjects were assigned to lansoprazole 60-mg intravenous bolus, followed by 6-mg/h continuous infusion; a 90-mg intravenous bolus followed by 6-, 7.5-, or 9-mg/h continuous infusion; or placebo. RESULTS:Mean intragastric pH values for lansoprazole regimens ranged from 4.8 to 5.2 (0-24 h), 5.5 to 6.0 (>24 to 48 h) and 5.2 to 5.6 (0-48 h). Within these three intervals, the percentages of time intragastric pH exceeded 4, 5 and 6 ranged from 65% to 96%, 54% to 88% and 30% to 61% respectively. Pharmacokinetic parameters were dose-independent with steady-state plasma concentrations achieved within 6-12 h postdose and maintained over 48 h. The mean systemic clearance of lansoprazole was lower in CYP2C19 heterozygous metabolizers than in homozygous extensive metabolizers (9.2 vs. 16.5 L/h), with substantial variability resulting in overlapping ranges of clearance values for both subpopulations. All lansoprazole regimens were well-tolerated. CONCLUSIONS:Lansoprazole administered as a 60-mg intravenous bolus followed by 6-mg/h continuous infusion produced intragastric pH effects comparable with those of higher dosage regimens.

journal_name

Aliment Pharmacol Ther

authors

Howden CW,Metz DC,Hunt B,Vakily M,Kukulka M,Amer F,Samra N

doi

10.1111/j.1365-2036.2006.02849.x

subject

Has Abstract

pub_date

2006-04-01 00:00:00

pages

975-84

issue

7

eissn

0269-2813

issn

1365-2036

pii

APT2849

journal_volume

23

pub_type

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