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  • Title: A double-blind, placebo-controlled, multicenter study with alprazolam and extended-release alprazolam in the treatment of panic disorder.
    Author: Pecknold J, Luthe L, Munjack D, Alexander P.
    Journal: J Clin Psychopharmacol; 1994 Oct; 14(5):314-21. PubMed ID: 7806686.
    Abstract:
    This is a double-blind, placebo-controlled, flexible-dose, multicenter, 6-week study comparing regular alprazolam (compressed tablet, CT), given four times per day, and extended release alprazolam (XR), given once in the morning. The aim of the XR preparation is to offer less frequent dosing and to reduce interdose anxiety. Of the intent-to-treat group of 209 patients, 184 completed 3 weeks of medication and were evaluated according to protocol. There was a completer rate for the 6 weeks of 94% (CT), 97% (XR), and 87% (placebo). On global measures, Hamilton Rating Scale for Anxiety, phobia rating, and work disability measures, both active treatment groups were equally effective and significantly more efficacious than the placebo cell on endpoint MANOVA analysis. On analysis of the panic factor with endpoint data, both active treatment groups were equally effective throughout the 6-week trial and significantly more efficacious than the placebo group. Drowsiness occurred more frequently with CT alprazolam (86% of patients) than with the XR preparation (79%) or placebo (49%).
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