Kinetic and cardiovascular comparison of immediate-release isradipine and sustained-release isradipine among non-treatment-seeking, cocaine-dependent individuals.

Abstract:

:The authors sought to determine whether sustained-release (SR) isradipine provided comparable systemic availability to that of immediate-release (IR) isradipine in non-treatment-seeking, cocaine-dependent individuals. This information could be used to design a rational dosage regimen for additional isradipine clinical trials in the treatment of stimulant dependence and related neurovascular disorders. Eight male volunteers who met Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM-IV) criteria for cocaine dependence participated in a randomized, double-blind, crossover study. Subjects received a 15-mg dose of an IR isradipine formulation and a 30-mg dose of an SR isradipine formulation, separated by a 2-day interval. Vital signs and blood sampling for isradipine serum levels were performed before and at 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 8, 10, 12, and 24 h after each isradipine dose administration. Neither the 15-mg dose of IR isradipine nor the 30-mg dose of SR isradipine produced significant adverse effects on cardiovascular parameters, but the IR formulation was more likely to produce marked short-term decreases in pressor response. Significant intersubject variability in serum concentrations and pharmacokinetic parameters occurred for both formulations. The relative bioavailability of the SR formulation was 55.5% of that of the IR formulation. Both formulations cumulatively may deliver about the same amount of drug, but IR isradipine achieves a higher peak concentration than SR isradipine. The more favorable cardiovascular profile of SR isradipine would, however, make it more appropriate as an investigational medication for the treatment of stimulant dependence and related neurovascular disorders.

authors

Johnson BA,Javors MA,Lam YW,Wells LT,Tiouririne M,Roache JD,Ait-Daoud N,Lawson K

doi

10.1016/j.pnpbp.2004.08.014

subject

Has Abstract

pub_date

2005-01-01 00:00:00

pages

15-20

issue

1

eissn

0278-5846

issn

1878-4216

pii

S0278-5846(04)00184-8

journal_volume

29

pub_type

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