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To determine the efficacy of divalproex sodium in the treatment of psychiatric outpatients with treatment refractory panic disorder and comorbid mood instability.

This was an 8-week, open-trial, flexible-dose outcome study conducted at a tertiary care referral centre. Individuals with panic disorder who failed to respond to a cognitive behavioural treatment program and standard antipanic medication, who also suffered from mood instability, were chosen to participate in the study. Divalproex sodium was administered at a flexible dose to reach serum levels of 300 to 600 umol/L (45 to 90 ug/ml) unless limited by tolerance. Patients were rated by self- and rater-administered questionnaires that measured the number of panic attacks, the degree of agoraphobic avoidance, the levels of depression, anxiety, and mood swings, and the perceived sense of well being.

Thirteen subjects were enrolled in the …