A 4 month open follow-up was done, preferentially with same medication as during acute treatment, of patients (n = 59) with DSM-IV-TR major depressive disorder with psychotic features, aged 18 to 65 years, who had completed as responders an acute double-blind 7 week trial with imipramine, venlafaxine or venlafaxine plus quetiapine. Main outcome measures were Hamilton Rating Scale for Depression and Clinical Global Impression Scale.
Six patients dropped out during the 4 month follow-up. Almost all patients (86.4 % ; 51/59) remained responder while remission rate increased from 59.3 % (35/59) to 86.8 % (46/53), independent of treatment. Relapse rate was low (3.8 % ; 2/53). Tolerability was good. Weight increased with all treatments.
Limitations were the limited sample size and consequent limited statistical power. The treatment during follow-up was not double-blind.
Continuation treatment with the same medication that was effective in the acute treatment trial, remained effective during the 4 month follow-up in many patients leading to further improvement, and was well tolerated.