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  • Title: Whether to increase or maintain dosage of mirtazapine in early nonimprovers with depression.
    Author: Ueno F, Nakajima S, Suzuki T, Abe T, Sato Y, Mimura M, Uchida H.
    Journal: J Clin Psychiatry; 2015 Apr; 76(4):434-9. PubMed ID: 25919835.
    Abstract:
    OBJECTIVE: To compare outcomes between increasing versus maintaining the dose of mirtazapine in patients with depression without initial improvement. METHOD: Data from a 6-week double-blind randomized placebo-controlled trial of mirtazapine in major depressive disorder (DSM-IV) conducted from November 2004 to December 2005 were used. Percentages of remitters (ie, a score of ≤ 7 in the 17-item Hamilton Depression Rating Scale [HDRS-17]) and HDRS-17 score changes from baseline to week 6 were compared in the following 2 pairs, using Fisher exact test or mixed-effects model for repeated measures: (1) subjects who failed to show a ≥ 20% decrease in the HDRS-17 total scores at week 1 but were assigned to continue 15 mg/d (stay(15) group) versus those who were assigned to increase the dose to 30 mg/d (increase(30) group) and (2) subjects who failed to show a ≥ 20% decrease in the HDRS-17 total scores with 30 mg/d at week 2 but were assigned to continue 30 mg/d (stay(30) group) versus those who were assigned to increase the dose to 45 mg/d (increase(45) group). RESULTS: The increase(30) group showed a numerically but not significantly higher remission rate and a significantly greater decrease in the HDRS-17 total score at week 6 than the stay(15) group (34.7% [8 of 23 patients] vs 14.3% [3 of 21 patients], P = .2; least squares mean, -15.8 vs -10.9, P = .003). No significant differences were found between the increase(45) and stay(30) groups. CONCLUSIONS: Dose increase of mirtazapine from 15 mg/d to 30 mg/d may be effective for patients with depression without initial improvement. However, effectiveness may not be the case beyond 30 mg/d. TRIAL REGISTRATION: JapicCTI identifier: 152830.
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