Steady-state dose proportionality of a once-a-day sustained-release diltiazem hydrochloride formulation in healthy subjects.

Abstract:

:In this open-label, randomized, cross-over study, 12 healthy subjects received four doses of a new sustained-release formulation of diltiazem hydrochloride for six consecutive days. Blood samples were drawn on days 5 and 6 for determination of plasma diltiazem and desacetyldiltiazem levels. The peak concentrations after 120, 240, 360, and 480 mg of diltiazem were 48.1, 112.6, 180.9, and 276.8 ng/ml, respectively, while the mean minimum concentrations were 6.3, 14.6, 24.9, and 44.6 ng/ml. The areas under the concentration-time curves were 702, 1,642, 2,622, and 4,004 ng.hr/ml. Prolonged, continuous absorption of diltiazem was noted over the 24-hour dosing period. The dose-adjusted mean steady-state plasma diltiazem levels after the four doses were significantly different, consistent with diltiazem's nonlinear absorption, but the plasma profiles were similar, indicating that the diltiazem release rate was not dose-dependent. Therapeutic plasma diltiazem levels (greater than or equal to 40 ng/ml) were maintained for 24 hours after the three larger doses. The changes in the pharmacokinetics of desacetyldiltiazem over the four diltiazem doses were similar to those of diltiazem. The number of adverse treatment experiences tended to increase with the higher doses, but none were severe. The results indicate that, according to their pharmacokinetic profiles, doses of 240 mg to 480 mg of diltiazem are suitable for once-daily administration.

journal_name

Clin Ther

journal_title

Clinical therapeutics

authors

Ziemniak J,Colligon I,Heald D

subject

Has Abstract

pub_date

1992-03-01 00:00:00

pages

158-65

issue

2

eissn

0149-2918

issn

1879-114X

journal_volume

14

pub_type

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