Evaluation of the Hypnotic Properties of Zolpidem-MR 12.5 mg and Zolpidem 10 mg Marketed Product Compared to Placebo in Patients With Primary Insomnia

Evaluation of the Hypnotic Properties of Zolpidem-MR 12.5 mg and Zolpidem 10 mg Marketed Product Compared to Placebo in Patients With Primary Insomnia. A Double-Blind, Randomized, Placebo-Controlled,Three Way Cross-Over Study

The primary objective is to evaluate the hypnotic efficacy of zolpidem-MR (modified release) 12.5 mg and zolpidem 10 mg marketed product in comparison with placebo in patients with primary insomnia and sleep maintenance difficulties, using polysomnography (PSG) recordings and patient sleep questionnaires.

The secondary objective is to evaluate the clinical safety and tolerability of zolpidem-MR 12.5 mg and zolpidem 10 mg marketed product in comparison with placebo.

Inclusion Criteria:

• Diagnosis of primary insomnia based on Diagnostic and Statistical Manual of Mental Disorders (DSM-IV) criteria