Lamotrigine compared to placebo and other agents with antidepressant activity in patients with unipolar and bipolar depression: a comprehensive meta-analysis of efficacy and safety outcomes in short-term trials.

OBJECTIVES: To meta-analytically summarize lamotrigine's effectiveness and safety in unipolar and bipolar depression. METHODS: We conducted systematic PubMed and SCOPUS reviews (last search =10/01/2015) of randomized controlled trials comparing lamotrigine to placebo or other agents with antidepressant activity in unipolar or bipolar depression. We performed a random-effects meta-analysis of depression ratings, response, remission, and adverse effects calculating standardized mean difference (SMD) and risk ratio (RR) ±95% confidence intervals (CIs). RESULTS: Eighteen studies (n=2152, duration=9.83 weeks) in patients with unipolar depression (studies=4, n=187; monotherapy vs lithium=1, augmentation of antidepressants vs placebo=3) or bipolar depression (studies=14, n=1965; monotherapy vs placebo=5, monotherapy vs lithium or olanzapine+fluoxetine=2, augmentation of antidepressants vs placebo=1, augmentation of mood stabilizers vs placebo=3, augmentation of mood stabilizers vs trancylpromine, citalopram, or inositol=3) were meta-analyzed. Lamotrigine's efficacy for depressive symptoms did not differ significantly in monotherapy vs augmentation studies (vs. placebo: p=0.98, I2=0%; vs active agents: p=0.48, I2=0%) or in unipolar vs bipolar patients (vs placebo: p=0.60, I2=0%), allowing pooling of each placebo-controlled and active-controlled trials. Lamotrigine outperformed placebo regarding depressive symptoms (studies=11, n=713 vs n=696; SMD=-0.15, 95% CI=-0.27, -0.02, p=0.02, heterogeneity: p=0.24) and response (after removing one extreme outlier; RR=1.42, 95% CI=1.13-1.78; p=0.003, heterogeneity: p=0.08). Conversely, lamotrigine did not differ regarding efficacy on depressive symptoms, response, or remission from lithium, olanzapine+fluoxetine, citalopram, or inositol (studies=6, n=306 vs n=318, p-values=0.85-0.92). Adverse effects and all-cause/specific-cause discontinuation were similar across all comparisons. CONCLUSIONS: Lamotrigine was superior to placebo in improving unipolar and bipolar depressive symptoms, without causing more frequent adverse effects/discontinuations. Lamotrigine did not differ from lithium, olanzapine+fluoxetine, citalopram, or inositol.

Long-term outcome of bipolar depressed patients receiving lamotrigine as add-on to lithium with the possibility of the addition of paroxetine in nonresponders: a randomized, placebo-controlled trial with a novel design.

OBJECTIVE: In two previous manuscripts, we described the efficacy of lamotrigine versus placebo as add-on to lithium (followed by the addition of paroxetine in nonresponders) in the short-term treatment of bipolar depression. In this paper we describe the long-term (68 weeks) outcome of that study. METHODS: A total of 124 bipolar depressed patients receiving lithium were randomized to addition of lamotrigine or placebo. After eight weeks, paroxetine was added to nonresponders for another eight weeks. Responders continued medication and were followed for up to 68 weeks or until a relapse or recurrence of a depressive or manic episode. RESULTS: After eight weeks, the addition of lamotrigine to lithium was significantly more efficacious than addition of placebo, while after addition of paroxetine in nonresponders both groups further improved with no significant difference between groups at week 16. During follow-up the efficacy of lamotrigine was maintained: time to relapse or recurrence was longer for the lamotrigine group [median time 10.0 months (confidence interval: 1.1-18.8)] versus the placebo group [3.5 months (confidence interval: 0.7-7.0)]. CONCLUSION: In patients with bipolar depression, despite continued use of lithium, addition of lamotrigine revealed a continued benefit compared to placebo throughout the entire study.

Efficacy and safety of two treatment algorithms in bipolar depression consisting of a combination of lithium, lamotrigine or placebo and paroxetine.

OBJECTIVE: In a previous paper, we reported about the efficacy of the addition of lamotrigine to lithium in patients with bipolar depression. In the second phase of this study paroxetine was added to ongoing treatment in non-responders. METHOD: Bipolar depressed patients (n = 124) treated with lithium were randomized to addition of lamotrigine or placebo. In non-responders after 8 weeks, paroxetine 20 mg was added for another 8 weeks to ongoing treatment. RESULTS: After 8 weeks the improvement in patients treated with lamotrigine vs. patients treated with placebo was significant. After addition of paroxetine this difference disappeared as a result of greater further improvement in the non-responders to placebo. CONCLUSION: Addition of lamotrigine to lithium was found effective in bipolar depressed patients. Further addition of paroxetine in non-responders to lithium plus lamotrigine did not appear to provide additional benefit, while it appeared to do so in non-responders to lithium plus placebo.

Long-term response to successful acute pharmacological treatment of psychotic depression.

BACKGROUND: Data about follow-up after acute pharmacological treatment of psychotic depression are scarce. METHODS: 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. RESULTS: 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: Limitations were the limited sample size and consequent limited statistical power. The treatment during follow-up was not double-blind. CONCLUSIONS: 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.

Efficacy and safety of lamotrigine as add-on treatment to lithium in bipolar depression: a multicenter, double-blind, placebo-controlled trial.

OBJECTIVE: Lamotrigine is one of the pharmacologic options for the treatment of bipolar depression but has only been studied as monotherapy. This study compared the acute effects of lamotrigine and placebo as add-on therapy to ongoing treatment with lithium in patients with bipolar depression. METHOD: Outpatients (N = 124) aged 18 years and older with a DSM-IV bipolar I or II disorder and a major depressive episode (Montgomery-Asberg Depression Rating Scale [MADRS] score > or = 18 and Clinical Global Impressions-Bipolar Version [CGI-BP] severity of depression score > or = 4) while receiving lithium treatment (0.6-1.2 mmol/L) were randomly assigned to 8 weeks of double-blind treatment with lamotrigine (titrated to 200 mg/d) or placebo. The primary outcome measure was mean change from baseline in total score on the MADRS at week 8. Secondary outcome measures were response (defined as a reduction of > or = 50% on the MADRS and/or change of depression score on the CGI-BP of "much improved" or "very much improved" compared to baseline) and switch to mania or hypomania (defined as a CGI-BP severity of mania score of at least mildly ill at any visit). Patients were included in the study between August 2002 (Spain started in October 2003) and May 2005. RESULTS: Endpoint mean change from baseline MADRS total score was -15.38 (SE = 1.32) points for lamotrigine and -11.03 (SE = 1.36) points for placebo (t = -2.29, df = 104, p = .024). Significantly more patients responded to lamotrigine than to placebo on the MADRS (51.6% vs. 31.7%, p = .030), but not on the CGI-BP change of depression (64.1% vs. 49.2%, p = .105). Switch to mania or hypomania occurred in 5 patients (7.8%) receiving lamotrigine and 2 patients (3.3%) receiving placebo (p = .441). CONCLUSION: Lamotrigine was found effective and safe as add-on treatment to lithium in the acute treatment of bipolar depression. TRIAL REGISTRATION: clinicaltrials.gov Identifier: NCT00224510.