Long-term nightly treatment with indiplon in adults with primary insomnia: results of a double-blind, placebo-controlled, 3-month study

Abstract

Objectives: To evaluate the efficacy and safety of indiplon in primary insomnia.

Design: Randomized, double-blind, placebo-controlled, 3-month study.

Setting: Multi-center outpatient setting.

Patients: N=702 (61% female; mean age 46 years) who met DSM-IV criteria for primary insomnia of at least 3 months' duration.

Interventions: Indiplon 10 mg (n=236), indiplon 20 mg (n=233), or placebo (n=233).

Measurements: Subjective assessment of each of the following: latency to sleep onset (sLSO), total sleep time (sTST), number of awakenings after sleep onset (sNAASO), wake time after sleep onset (sWASO), sleep quality, Insomnia Severity Index (ISI), and global improvement.

Results: Treatment with indiplon resulted in significant improvement relative to placebo at all time points for the primary endpoint, sLSO. Mean sLSO at Month 1 for each treatment group was: 10 mg (34.0 +/- 1.3 mins), 20 mg (33.0 +/- 1.3 mins), and placebo (48.7 +/- 1.9 mins; P <0.0001 for both comparisons); efficacy was sustained through Month 3. Both doses of indiplon resulted in significant improvement in sleep maintenance and duration endpoints, sTST and sWASO, as well as sleep quality, ISI, and global improvement at all assessment time points.

Conclusions: In patients with chronic insomnia, long-term nightly treatment with 10 mg and 20 mg doses of indiplon resulted in significant and sustained efficacy in sleep onset, maintenance, and duration, and significant associated improvement in both daytime functioning and quality of life.

Figure 1

Flow Diagram

Figure 2

Proportion of patients meeting IGR-C responder criteria during 3 months of treatment: results of an observed case analysis. Responder criteria: IGR-C ≤2 (much/very-much improved).

Figure 3

Proportion of patients meeting ISI Remission criteria during 3 months of treatment: results of an observed case analysis. Remitter criteria: ISI-total score ≤10; ISI: Insomnia Severity Index.