Relative abuse liability of indiplon and triazolam in humans: A comparison of psychomotor, subjective, and cognitive effects

被引:10
作者
Carter, Lawrence P.
Griffiths, Roland R.
Suess, Patricia E.
Casada, John H.
Wallace, Christopher L.
Roache, John D.
机构
[1] Univ Texas, Hlth Sci Ctr, Dept Psychiat, San Antonio, TX 78229 USA
[2] Johns Hopkins Univ, Sch Med, Dept Psychiat & Behav Sci, Baltimore, MD USA
[3] Johns Hopkins Univ, Sch Med, Dept Neurosci, Baltimore, MD 21205 USA
[4] Univ Texas, Hlth Sci Ctr, Dept Pharmacol, San Antonio, TX 78229 USA
关键词
D O I
10.1124/jpet.107.119693
中图分类号
R9 [药学];
学科分类号
1007 ;
摘要
Indiplon [N-methyl-N-[3-[3-(2-thienylcarbonyl)-pyrazolo[1,5-alpha]pyrimidin-7-yl] phenyl] acetamide; NBI 34060] is a positive allosteric GABA A receptor modulator that is under development for the treatment of insomnia. This study compared the abuse potential of indiplon, a compound with preferential affinity for GABA A receptors containing an alpha(1) subunit, with triazolam in 21 volunteers with histories of drug abuse. Placebo, triazolam (0.25, 0.5, and 0.75 mg), and indiplon (30, 50, and 80 mg) were studied in counterbalanced order under double-blind conditions at two different residential research facilities. Both drugs impaired psychomotor and cognitive performance and produced similar dose-related increases in participant and observer ratings of drug strength. The onset of action of both drugs was rapid (30 min); however, the duration of action of indiplon (3-4 h) was shorter than that of triazolam (4-6 h). The profiles of subjective effects of triazolam and indiplon were similar; however, a maximum of 52% of participants identified indiplon as a benzodiazepine or barbiturate, compared with 81% of participants after 0.75 mg of triazolam. On participant-rated subjective effects relevant to sedation, the slope of the triazolam dose-effect curve was significantly steeper than that of indiplon. Neither the largest doses of indiplon and triazolam nor the slope of the indiplon and triazolam dose-effect curves were significantly different from each other on any of the same-day or next-day measures of positive drug effects or next-day measures of reinforcing effects. Together, these data suggest that although the abuse potential of indiplon is not different from that of triazolam at these doses, psychomotor and cognitive impairment after large doses of indiplon might be less.
引用
收藏
页码:749 / 759
页数:11
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