Skip to main content
Download PDF
  • Research article
  • Open access
  • Published:

Real-world clinical features of and antidepressant prescribing patterns for outpatients with bipolar disorder

BMC Psychiatry volume 20, Article number: 555 (2020) Cite this article

Abstract

Background

Several evidence-based practice guidelines have been developed to better treat bipolar disorder. However, the articles cited in these guidelines were not sufficiently based on real-world clinical practice.

Methods

The MUlticenter treatment SUrvey on BIpolar disorder in Japanese psychiatric clinics (MUSUBI) is a study conducted to accumulate evidence on the real-world practical treatment of bipolar disorder. Psychiatrists were asked to complete a questionnaire about patients with bipolar disorder by performing a retrospective medical record survey. The questionnaire included patient characteristics (age, gender, height, weight, academic background, and occupational status), comorbidities, mental status, treatment period, Global Assessment of Functioning (GAF) score, and details of pharmacological treatment.

Results

Data on 2705 patients were included in this study. The proportion of patients receiving antidepressant prescriptions was 40.9%. The most commonly used antidepressant was duloxetine, and the most frequently used antidepressant class was selective serotonin reuptake inhibitors (SSRIs). Binomial logistic regression analysis and bivariate analysis revealed that the usage of antidepressants was correlated with low prescription rates for mood stabilizers, high prescription rates for anxiolytics and hypnotics, and low GAF scores. In addition, patients in a depressive state had a significantly higher rate of antidepressant prescriptions than patients with other mental states.

Conclusions

Approximately 40% of patients in Japan with a diagnosis of bipolar disorder have received antidepressants. Antidepressants were most often prescribed in combination with mood stabilizers, antipsychotics or both. Patients who were prescribed antidepressants received fewer mood stabilizers, more anxiolytics, and more hypnotics than those who did not receive antidepressant prescriptions.

Peer Review reports

Background

Bipolar disorder is an affective disorder that is characterized by repeated changes in activity or energy and is associated with characteristic cognitive, physical, and behavioral symptoms that impair the patient’s social functioning [1, 2]. The estimated lifetime prevalence of bipolar disorder among adults is 2.4% worldwide [3]. The average age at onset is 18 years for bipolar I and 20 years for bipolar II [3], and the prevalence in men and women is similar [4]. Problematic behavior caused by emotional changes often has negative social, financial, and occupational consequences [1]. The suicide risk of bipolar disorder patients has been reported to be 20 to 30 times higher than that of the general population [5]. Compared with manic and hypomanic episodes, bipolar depression and the symptoms of residual bipolar depression are associated with long-term morbidity and impaired function [6].

Several practice guidelines have been developed to better treat bipolar disorder. These evidence-based guidelines represent the current standard of treatment for bipolar disorder. However, the articles cited in these guidelines were clinical or basic studies conducted in specific conditions and settings and were not sufficiently based on real-world clinical practice. In recent years, the efficacy of antidepressants for patients with bipolar disorder has become an important issue. Guidelines for the treatment of bipolar disorder have been published by the Japanese Society of Mood Disorders (JSMD) and state that antidepressant monotherapy is not recommended for the mania phase or during rapid cycling [7]. However, they do not state that antidepressants should be avoided [7]. According to the National Institute for Health and Care Excellence (NICE) guidelines on bipolar disorder and the latest guidance, prescriptions of fluoxetine (a selective serotonin reuptake inhibitor (SSRI)) combined with olanzapine are recommended for moderate to severe depression [8]. On the other hand, the guidelines state that if a person develops mania or hypomania and is taking an antidepressant with or without a mood stabilizer, the cessation of antidepressants should be considered. Thus, in the treatment of bipolar disorder, antidepressant prescription is at the discretion of the physician [9].

Hence, research on prescriptions based on real-world evidence has attracted attention [10]. Research on real-world physicians’ prescribing behavior may identify medical suggestions that are missed by following current practice guidelines alone. A large-scale epidemiological study in Scotland found that approximately 60% of bipolar disorder patients were prescribed antidepressants [11]. It also revealed that the prescription rate of lithium carbonate, which is the first-choice drug for bipolar disorder [11], is only approximately 20% and is decreasing each year [11]. This trend was also consistent with the longitudinal data analysis results obtained from the National Ambulatory Medical Care Surveys [12]. In a study using Swedish national registries, 70% of patients with bipolar disorder were prescribed antidepressants [13]. In the United States, antidepressants are prescribed to 57.5% of patients with bipolar disorder [12]. In a study of nationwide and population-based prescription patterns in the Danish population, 59.12% of patients with bipolar disorder were prescribed antidepressants [14]. On the other hand, in a nationwide register-based study in South Korea, the antidepressant prescription rate for patients with bipolar disorder was 27.4–33.7% [15].

However, in Japan, the proportion of bipolar disorder patients who are prescribed antidepressants remains unclear. Additionally, there is a lack of large-scale clinical research on the actual prescription pattern of antidepressants for patients with bipolar disorder in Japan. Although practice guidelines are useful as a tool for achieving better prescription, real-world practice has limitations and can be wrong because of inappropriate prescribing habits [11]; therefore, a large-scale, multicenter observational study of the pharmacological treatment of patients with bipolar disorder is needed in Japan.

More than 90% of all patients with mood disorders in Japan are outpatients, half of whom are treated at clinics that are members of the Japanese Association of Neuro-Psychiatric Clinics. Against this background, joint research (the MUlticenter treatment SUrvey on BIpolar disorder in Japanese psychiatric clinics, or MUSUBI) was conducted between the Japanese Association of Neuro-Psychiatric Clinics and the Japanese Society of Clinical Neuropsychopharmacology to accumulate evidence on the real-world practical treatment of bipolar disorder in Japan. In this research, we assessed the rate of antidepressant prescription and its relation to clinical characteristics in outpatients with bipolar disorder in Japan.

Methods

Study design and subjects

MUSUBI is a cross-sectional study in which a questionnaire was administered at 176 outpatient clinics belonging to the Japanese Association of Neuro-Psychiatric Clinics from September to October 2016. We collected cross-sectional data on outpatients with bipolar disorder who visited each psychiatric clinic from October 1, 2016, to December 31, 2016. The analysis included only the current data for each patient at the time of the first visit during the study period (a single assessment time point). Each clinic collected data on up to 20 patients with bipolar disorder in the order that they visited the clinic [16]. Patients diagnosed with bipolar disorder based on the ICD-10 criteria [2] and treated at these clinics were included in this study. There were no exclusion criteria.

Study procedures

Clinical psychiatrists were asked to complete a questionnaire about patients with bipolar disorder by performing a retrospective medical record survey. The questionnaire included patient characteristics (age, gender, height, weight, academic background, and occupational status), comorbidities, mental status, treatment period, Global Assessment of Functioning (GAF) score, and details of pharmacological treatment. The duration of prescriptions for various agents was not investigated. This study focused on antidepressant prescriptions for bipolar disorder patients and the profiles of these patients.

Statistical analysis

All statistical analyses were performed with EZR (Saitama Medical Center, Jichi Medical University, Saitama, Japan) [17], which is a graphical user interface for R (The R Foundation for Statistical Computing, Vienna, Austria, version 3.5.2). More precisely, it is a modified version of R Commander (version 2.5–1) incorporating statistical functions that are frequently used in biostatistics.

All statistical tests were based on a two-sided significance level of 0.05. Demographic and clinical characteristics were analyzed using the chi-square test and the Mann-Whitney U test for differences between patients with and without antidepressant prescriptions. Univariate logistic regression analyses were performed to identify demographic and clinical features. All factors associated with antidepressant use among bipolar disorder patients were examined using binomial logistic regression with forced entry to avoid overlooking any potential associations. These factors included sex, body mass index (BMI), age at study entry, age at onset of bipolar symptoms, duration of attending clinics, current work status, educational level, mood stabilizer prescription (valproic acid, lithium carbonate, carbamazepine and lamotrigine), antipsychotic prescription, anxiolytic (benzodiazepines only) prescription, hypnotic prescription, intelligence quotient (IQ), GAF score, psychiatric comorbidity, personality disorder, developmental disorder, physical comorbidity, rapid cycling status, substance abuse, and mood status. The dummy variables included were as follows: male = 0, female = 1; employed = 1, unemployed = 0; some high school or high school graduate = 1, junior college = 2, college or postgraduate degree = 3; taking mood stabilizers =1, not taking mood stabilizers = 0; taking antipsychotics = 1, not taking antipsychotics = 0; taking anxiolytics = 1, not taking anxiolytics = 0; taking hypnotics = 1, not taking hypnotics = 0; IQ (> 85) = 0, IQ (85–71) = 1, IQ (< 71) = 2; GAF (81–100) = 0, GAF (61–80) = 1, GAF (41–60) = 2, GAF (< 41) = 3; psychiatric comorbidity = 1, no psychiatric comorbidity = 0; personality disorder = 1, no personality disorder = 0; developmental disorder = 1, no developmental disorder = 0; physical comorbidity = 1, no physical comorbidity = 0; rapid cycling = 1, no rapid cycling = 0; substance abuse = 1, no substance abuse = 0. Four mood states (depressive, mixed, remission and manic) were analyzed as nominal measures.

Ethics

This study was conducted in accordance with the Declaration of Helsinki and the Japanese Ethical Guidelines for Medical and Health Research Involving Human Subjects. Prior to the initiation of the study, the study protocol was reviewed and approved by the institutional review board of the ethics committee of the Japanese Association of Neuro-Psychiatric Clinics. Since this was a retrospective medical record survey, it was exempted from the requirement for informed consent; however, we released information on this research so that patients were free to opt out [16]. The administrative permissions and licenses were acquired by our team to access the data used in our research.

Results

Completed questionnaires on 3213 outpatients with bipolar disorder were returned from the 176 originally solicited outpatient facilities. A total of 508 outpatients with missing data were handled with listwise deletions. Thus, data on a total of 2705 patients were included in this study. The characteristics of the subjects are shown in Table 1.

Table 1 Demographic characteristics
Full size table

The proportion of patients who received antidepressant prescriptions was 40.9% (1107/2705). The combinations of antidepressant, mood stabilizer, and antipsychotic prescriptions are shown in Table 2. The most common combinations were a mood stabilizer and an antipsychotic, at 27.6%; mood stabilizer monotherapy, at 24.0%; a mood stabilizer and an antidepressant, at 16.6%; a mood stabilizer, an antipsychotic and an antidepressant, at 15.0%; an antipsychotic and an antidepressant, at 5.5%; antipsychotic monotherapy, at 5.4%; and antidepressant monotherapy, at 3.7%. A total of 2.1% of the patients were not prescribed a mood stabilizer, antipsychotic, or antidepressant.

Table 2 Patterns of combination among antidepressant, mood stabilizer, and antipsychotic prescriptions
Full size table

The results of the univariate analysis are shown in Table 1. due to multiple (20) comparisons, a Bonferroni correction was applied, yielding a corrected significance criterion of p < 0.0025. By this threshold, the presence or absence of antidepressant use showed a statistically significant difference according to mood stabilizer prescriptions, anxiolytic prescriptions, hypnotic prescriptions, GAF scores, psychiatric comorbidities and mood status. Compared to the group that did not use antidepressants, the group using antidepressants had a lower rate of prescriptions for mood stabilizers (10%; p < 0.001) and higher rates of prescriptions for anxiolytics (18.2%; p < 0.001) and hypnotics (7.9%; p < 0.001). In addition, the group taking antidepressants had lower GAF scores (p < 0.001) and a higher proportion of psychiatric comorbidities (5.3%; p < 0.001) than the group not taking antidepressants. A higher proportion of patients were prescribed mood stabilizers only or mood stabilizers and antipsychotics (87.3%; 1395/1598) in the group not taking antidepressants than in the group taking antidepressants (77.3%; 856/1107). Therefore, prescription rates for mood stabilizers were relatively low in the antidepressant prescription group.

Regarding the antidepressant prescription rate associated with each mood state, 52.7% of prescriptions were associated with a depressive state, 39.1% with a mixed-features state, 34.2% with a remission state, and 19.1% with a manic state. A chi-square test between the 4 groups showed a statistically significant difference (p < 0.001). A four-group multiple comparison test showed that the depressive state group was prescribed antidepressants at a significantly higher rate than the other groups (p < 0.001). On the other hand, the proportion of antidepressant prescriptions was significantly lower for the manic group than for the other groups (p < 0.001). There was no statistically significant difference between the groups in the mixed state or the remission state (p = 0.959).

We calculated the mean GAF score for each mood status group using the class value. The GAF scores of the groups were as follows: depressive group, mean = 63.8; manic group, mean = 69.8; remission group, mean = 81.6; mixed-feature group, mean = 62.6. In addition, when a multiple comparison test using Tukey’s correction was performed, a statistically significant difference was observed between all pairs except for the depressive group and the mixed-features group.

A total of 20 antidepressants were prescribed for the patients with bipolar disorder (Table 3). The most commonly used antidepressant was duloxetine (a serotonin-norepinephrine reuptake inhibitor, or SNRI), and SSRIs were the most frequently used class of antidepressants. There were also some prescriptions, albeit relatively few, for tricyclic antidepressants (Table 3). A total of 848 patients were prescribed one antidepressant, 235 patients were prescribed two antidepressants, 23 patients were prescribed three antidepressants, and one patient was prescribed four antidepressants.

Table 3 Number of antidepressant prescriptions for patients with bipolar disorder
Full size table

Binomial logistic regression analysis revealed that the patients with antidepressant prescriptions had a significantly higher BMI (odds ratio; OR [95% CI] = 1.04 [1.02–1.06], p < 0.001), longer duration of attending clinics (OR = 1.02 [1.01–1.04, p = 0.003]), lower prescription rate of mood stabilizers (OR = 0.48 [0.38–0.60], p < 0.001]), lower prescription rate of antipsychotics (OR = 0.58 [0.49–0.69], p < 0.001), higher prescription rate of anxiolytics (OR = 1.93 [1.63–2.28], p < 0.001), higher prescription rate of hypnotics (OR = 1.32 [1.11–1.57], p = 0.001), and lower GAF score (OR = 1.16 [1.01–1.33], p = 0.037) than those who were not prescribed antidepressants. Patients in the manic (OR = 0.22 [0.15–0.32], p < 0.001), mixed (OR = 0.57 [0.46–0.70], p < 0.001) and remission states (OR = 0.54 [0.40–0.73], p < 0.001) had significantly lower rates of antidepressant prescriptions than patients in the depressive state had. There was no significant difference between the proportions of rapid cyclers who did and did not take antidepressants (Table 4). In a binomial logistic regression analysis with forced entry, multicollinearity between variables was not observed.

Table 4 Factors associated with antidepressant prescriptions
Full size table

We performed a multiple comparison test applying Tukey’s correction for the combinations of BMI and prescription type (antidepressants (AD), mood stabilizers (MS) and antipsychotics (AP)). Statistically significant differences were found according to BMI with the following combinations: MS + AP > no prescription (p = 0.010); AD+MS + AP > no prescription (p < 0.001); AD+MS + AP > MS monotherapy (p < 0.001); AD+MS + AP > AP monotherapy (p = 0.002); AD+MS + AP > AD+MS (p = 0.015).

Discussion

Our MUSUBI baseline data analysis showed that antidepressants are prescribed for 40.9% of patients with bipolar disorder in a real-world clinical setting. Many of these patients receive antidepressants in combination with mood stabilizers and/or antipsychotics. Data from other countries have shown that antidepressant prescription rates for patients with bipolar disorder are approximately 30–70% [11,12,13,14,15, 18, 19], which is similar to the findings of our study. Especially in Korea, the prescription rate of antidepressants for patients with bipolar disorder is known to be increasing each year [15]. In a review comparing international practice guidelines, mood stabilizers or antipsychotics were recommended as the first-choice medication for bipolar depression. The efficacy and safety of long-term antidepressant use for bipolar II disorder has been emphasized in most guidelines [20].

According to the latest guidelines of the Canadian Network for Mood and Anxiety Treatments (CANMAT) and the International Society of Bipolar Disorders (ISBD) 2018 for the treatment of bipolar disorder [21], there is evidence based on a recent meta-analysis [22] that antidepressants are effective in treating acute bipolar depression and preventing depression symptoms in maintenance therapy. The guidelines also emphasized that antidepressant prescriptions should be considered clinically useful as a second-line add-on (combined with mood stabilizers) treatment for bipolar depression. The CANMAT and ISBD 2018 guidelines noted that historically, much of the focus has been on the risk of manic switching or rapid cycling, with an underappreciation of the relatively weak efficacy data [21]. This new appreciation for the efficacy of adjunctive antidepressant therapy led to a change in the CANMAT and ISBD 2018 guidelines, which also emphasized that this is a key aspect of decision making with regard to antidepressants.

Our study revealed that the most commonly used antidepressant for bipolar disorder outpatients was duloxetine, while the most frequently used antidepressant class was SSRIs. The latest CANMAT and ISBD 2018 guidelines [21] and the NICE guidelines [8] recognize the efficacy of adjuvant SSRI therapy, but there is insufficient evidence for the efficacy of duloxetine, which is an SNRI. This suggests that further prospective studies are needed regarding the efficacy of SNRIs in patients with bipolar disorder.

Regarding differences in demographic and clinical characteristics between patients with and without antidepressants, a previous study found that its antidepressant prescription group had a significantly higher proportion of women [11, 15]. In addition, it was reported that patients with antidepressant prescriptions had a high rate of conversion to a manic state [13] and a high comorbidity rate of anxiety disorders [15]. In particular, the prescription of antidepressants for bipolar disorder has been debated due to the risk of developing a manic state and the risk of increasing rapid cycling [13, 23,24,25,26]. However, in our study, there was no significant difference in the proportion of rapid cyclers between patients who took antidepressants and those who did not (p = 0.374). Moreover, in a comparison of antidepressant prescriptions between patients in a manic state and those in a remission state, the proportion of antidepressant prescriptions was significantly lower among the manic-state group (p < 0.001). Although additional treatment with antidepressants for bipolar depressive episodes did not improve mood in the short term compared to placebo [27], a recent meta-analysis reported that, in the long term, antidepressants have the potential to improve bipolar II depression in particular without increasing the risk of conversion to a manic state [28]. This meta-analysis also reported that the elevated risk of affective switching with antidepressant monotherapy compared with mood stabilizer monotherapy may contribute to the protective effect of mood stabilizers for diminishing manic/hypomanic episodes [28]. The results of this meta-analysis are considered to support the validity of prescribing behavior in the real world. On the other hand, since our study was a cross-sectional design, we cannot prove a causal relationship between antidepressant prescriptions and the risk of rapid cycling in bipolar disorder.

Regarding suicidality, there have been various reports that prescribing antidepressants in patients with bipolar disorder increases [29,30,31] or decreases the risk of suicide attempts [32, 33]. On the other hand, the rate of completed suicide in patients with bipolar disorder has been reported to have no significant difference between patients with and without antidepressant prescription according to logistic regression multivariant analysis [34]. Thus, there is contradictory evidence about the relationship between suicide and antidepressants. The CANMAT and ISBD 2018 guidelines do not provide a certain consensus on the causal relationship between antidepressant prescription and suicide in bipolar disorder due to limited data [21]. In any case, evaluation of treatment adherence is important. Because the common method of suicide in patients with bipolar disorder is self-poisoning, the potential benefits of various treatments should be considered against their risk of toxicity and lethality [21]. Since our study was a cross-sectional study, we could not assess the causal relationship between antidepressants and suicide in bipolar disorder.

Antidepressant monotherapy (without mood stabilizers and antipsychotics) is clearly associated with manic conversion and activation syndrome [13, 35,36,37]. However, it should be noted that 251 patients were prescribed antidepressants without mood stabilizers in the present study (9.3%; 251/2705), and 44 patients were prescribed antidepressants in the manic state (1.6%; 44/2705). Although antidepressant monotherapy was present (3.7%; 101/2705), the prevalence was lower than in Swedish [13] and Scottish [11] cohort studies. According to the latest evidence, patients with a history of antidepressant-induced mania or hypomania and recent rapid cyclers should avoid antidepressants, and antidepressant monotherapy should not be used to treat bipolar I depression [13, 37].

Unfortunately, some physicians in the clinic may have limited access to the latest information and may not be able to practice adequate evidence-based medicine; thus, there is the possibility that antidepressant monotherapy may be prescribed based on bad clinical practice. In addition, our logistic regression analysis revealed that the group that received antidepressants had a lower rate of mood stabilizer prescriptions. It is possible that bipolar depression may be treated as a major depressive disorder in the real world; alternatively, some patients who were misdiagnosed with bipolar disorder might have been included among our subjects.

Antidepressant prescriptions were associated with higher rates of anxiolytic and hypnotic prescriptions in the present study. This was consistent with the finding of the Bipolar CHOICE study that benzodiazepine users have high antidepressant prescription rates [38]. With regard to cognitive function in those with bipolar disorder, there are clear impairments associated with all mental states [39]. In particular, patients in a depressive state show greater impairment than euthymic patients on tests of verbal recall and fine motor skills [39]. Several reports have suggested that long-term use of benzodiazepine agents is associated with cognitive impairment [40, 41], but recently, some researchers have found that short-term use of benzodiazepine agents does not impair cognitive function [42]. Furthermore, they suggested that short-term use of benzodiazepine agents could improve information processing speed after acute treatment and at the 1-year follow-up [42]. However, in any case, there is a lack of evidence on the positive effects and adverse events of benzodiazepine for the treatment of bipolar disorder. The usefulness of concomitant benzodiazepine with antidepressants should be evaluated for each patient, and further longitudinal studies are required.

Interestingly, the BMI of patients receiving antidepressants was significantly greater than that of patients who were not prescribed antidepressants. In addition, the group taking antidepressants had significantly lower rates of antipsychotic and mood stabilizer prescription than the group not taking antidepressants. Thus, antidepressants may have a greater impact than antipsychotics on weight gain, although our study had a cross-sectional design and could not clarify the causal relationship.

In addition, binomial logistic regression analysis showed that the group of patients with antidepressant prescriptions had a significantly longer duration of attending clinic. It is known that patients with bipolar disorder have a longer duration of depression symptoms than manic symptoms [43]. A previous study revealed that the number of psychotropic agent prescriptions increased with prolonged treatment of bipolar disorder [44]. On the other hand, an unsuitable combination of antidepressant prescriptions may lead to polypharmacy and may adversely affect the patient’s mental state [45].

In our findings, the patients who were prescribed antidepressants had lower GAF scale scores. Because patients with bipolar depression are more likely to be prescribed antidepressants than patients in other phases, the GAF might have been administered during the bipolar depression phase [46]. A cross-sectional design was used in this study; thus, we could not determine a causal relationship between low GAF scores and prescriptions for antidepressants in our study population.

Limitations

We did not distinguish between bipolar I and bipolar II and did not randomize patient selection; therefore, this study has limitations in terms of heterogeneity and selection bias in the patient population.

In addition, it was not possible to specifically distinguish between bipolar I and bipolar II with regard to the risk of mania during treatment and the potential protective effects of mood stabilizers or antipsychotics.

According to the guidelines, the appropriate antidepressant treatment for patients with bipolar disorder varies by subtype. Clinically, there is accumulating evidence that antidepressants are more effective in bipolar II than in bipolar I [21]. Additionally, it is emphasized that bipolar I should not be treated with antidepressant monotherapy [9]. However, this study does not distinguish between subtypes, which makes it somewhat difficult to determine which prescriptions pose a high risk in each subtype. This is one of the major limitations of our study. However, regardless of the subtype, antidepressants are effective against acute bipolar depression and have a certain degree of effectiveness in preventing depression during the maintenance phase [21]. On the other hand, the CANMAT and ISBD 2018 guidelines are not recommending antidepressant prescriptions for the manic state in any subtype of bipolar disorder [21].

Bipolar II patients may be prescribed antidepressants more frequently than bipolar I patients because of the deleterious consequences of antidepressants in the latter group. However, a longitudinal study that distinguished subtypes of bipolar disorder showed that both bipolar I and II had a much higher proportion of depressive symptoms (31.9 and 50.3%, respectively) and remission (52.7 and 46.1%, respectively) than cycling/mixed symptoms (5.9 and 2.3%, respectively) or manic/hypomanic symptoms (8.9 and 1.3%, respectively) [47, 48]. Our findings are largely consistent with previous studies. Therefore, although we were not able to distinguish bipolar subtypes, we can generalize the findings. Clinical evaluation in this study was performed by the doctors in charge of the patients; the doctors were well trained, but the diagnosis was not assessed through structural interviews. Thus, the possibility of some interrater variability cannot be excluded. Our study has a cross-sectional design, not a longitudinal design. Therefore, the causal relationships among the variables are unknown. Further longitudinal studies are needed to confirm the details of prescription patterns for patients with bipolar disorder in Japan.

Furthermore, in our study, we evaluated the manic-depressive mixed state, but we do not have accurate data on Mixed depression, defined as depression with excitatory symptoms [49]. Mixed depression may have been included in the depressive state or the mixed-feature state but could not be separated and extracted. Mixed depression is a fundamental topic in the evaluation and treatment of depression or bipolar disorder. Physicians should be aware that antidepressant prescriptions for mixed depression pose a high risk [49].

Conclusions

Approximately 40% of patients with a diagnosis of bipolar disorder in Japan have received antidepressants. Antidepressants were most often prescribed in combination with mood stabilizers, antipsychotics or both. Patients who were prescribed antidepressants received fewer mood stabilizers, more anxiolytics, and more hypnotics than those who did not receive antidepressant prescriptions. Antidepressant prescription was correlated with higher BMI, lower GAF scores and patients in a bipolar depressive state.

Availability of data and materials

The datasets for the current study are available from the corresponding author on reasonable request.

Abbreviations

MUSUBI:

Multicenter treatment survey on bipolar disorder in Japanese psychiatric clinics

SSRI:

Selective serotonin reuptake inhibitor

GAF:

Global Assessment of Functioning

BMI:

Body mass index

References

  1. Anderson IM, Haddad PM, Scott J. Bipolar disorder. BMJ (Clinical research ed). 2012;345:e8508.

    Google Scholar 

  2. World Health Organization. International classification of diseases and related health problems, 10th revision. Geneva: World Health Organization; 1992.

    Google Scholar 

  3. Merikangas KR, Jin R, He JP, Kessler RC, Lee S, Sampson NA, Viana MC, Andrade LH, Hu C, Karam EG, et al. Prevalence and correlates of bipolar spectrum disorder in the world mental health survey initiative. Arch Gen Psychiatry. 2011;68(3):241–51.

    Article  PubMed  PubMed Central  Google Scholar 

  4. Seedat S, Scott KM, Angermeyer MC, Berglund P, Bromet EJ, Brugha TS, Demyttenaere K, de Girolamo G, Haro JM, Jin R, et al. Cross-national associations between gender and mental disorders in the World Health Organization World Mental Health Surveys. Arch Gen Psychiatry. 2009;66(7):785–95.

    Article  PubMed  PubMed Central  Google Scholar 

  5. Pompili M, Gonda X, Serafini G, Innamorati M, Sher L, Amore M, Rihmer Z, Girardi P. Epidemiology of suicide in bipolar disorders: a systematic review of the literature. Bipolar Disord. 2013;15(5):457–90.

    Article  PubMed  Google Scholar 

  6. Simon GE, Bauer MS, Ludman EJ, Operskalski BH, Unutzer J. Mood symptoms, functional impairment, and disability in people with bipolar disorder: specific effects of mania and depression. J Clin Psychiatry. 2007;68(8):1237–45.

    Article  PubMed  Google Scholar 

  7. Kanba S, Kato T, Terao T, Yamada K. Guideline for treatment of bipolar disorder by the Japanese Society of Mood Disorders, 2012. Psychiatry Clin Neurosci. 2013;67(5):285–300.

    Article  PubMed  Google Scholar 

  8. National Collaborating Centre for Mental Health. National institute for health and care excellence: clinical guidelines. In: Bipolar disorder: the NICE guideline on the assessment and management of bipolar disorder in adults, children and young people in primary and secondary care. edn. Leicester: British Psychological Society. (c) The British Psychological Society & The Royal College of Psychiatrists, 2014; 2018.

    Google Scholar 

  9. Pacchiarotti I, Bond DJ, Baldessarini RJ, Nolen WA, Grunze H, Licht RW, Post RM, Berk M, Goodwin GM, Sachs GS, et al. The International Society for Bipolar Disorders (ISBD) task force report on antidepressant use in bipolar disorders. Am J Psychiatry. 2013;170(11):1249–62.

    Article  PubMed  PubMed Central  Google Scholar 

  10. Sherman RE, Anderson SA, Dal Pan GJ, Gray GW, Gross T, Hunter NL, LaVange L, Marinac-Dabic D, Marks PW, Robb MA, et al. Real-world evidence - what is it and what can it tell us? N Engl J Med. 2016;375(23):2293–7.

    Article  PubMed  Google Scholar 

  11. Lyall LM, Penades N, Smith DJ. Changes in prescribing for bipolar disorder between 2009 and 2016: national-level data linkage study in Scotland. Br J Psychiatry. 2019;215(1):415–21.

    Article  PubMed  PubMed Central  Google Scholar 

  12. Rhee TG, Olfson M, Nierenberg AA, Wilkinson ST. 20-year trends in the pharmacologic treatment of bipolar disorder by psychiatrists in outpatient care settings. Am J Psychiatry. 2020;177(8):706–15.

    Article  PubMed  PubMed Central  Google Scholar 

  13. Viktorin A, Lichtenstein P, Thase ME, Larsson H, Lundholm C, Magnusson PK, Landén M. The risk of switch to mania in patients with bipolar disorder during treatment with an antidepressant alone and in combination with a mood stabilizer. Am J Psychiatry. 2014;171(10):1067–73.

    Article  PubMed  Google Scholar 

  14. Kessing LV, Vradi E, Andersen PK. Nationwide and population-based prescription patterns in bipolar disorder. Bipolar Disord. 2016;18(2):174–82.

    Article  CAS  PubMed  Google Scholar 

  15. Yoon W, Shon SH, Hong Y, Joo YH, Lee JS. Antidepressant prescription patterns in bipolar disorder: a nationwide, register-based study in Korea. J Korean Med Sci. 2018;33(46):e290.

    Article  PubMed  PubMed Central  CAS  Google Scholar 

  16. Tsuboi T, Suzuki T, Azekawa T, Adachi N, Ueda H, Edagawa K, Katsumoto E, Kubota Y, Goto E, Hongo S, et al. Factors associated with non-remission in bipolar disorder: the multicenter treatment survey for bipolar disorder in psychiatric outpatient clinics (MUSUBI). Neuropsychiatr Dis Treat. 2020; (in press).

  17. Kanda Y. Investigation of the freely available easy-to-use software ‘EZR’ for medical statistics. Bone Marrow Transplant. 2013;48(3):452–8.

    Article  CAS  PubMed  Google Scholar 

  18. Baldessarini R, Henk H, Sklar A, Chang J, Leahy L. Psychotropic medications for patients with bipolar disorder in the United States: polytherapy and adherence. Psychiatr Serv (Washington, DC). 2008;59(10):1175–83.

    Article  Google Scholar 

  19. Baldessarini RJ, Leahy L, Arcona S, Gause D, Zhang W, Hennen J. Patterns of psychotropic drug prescription for US patients with diagnoses of bipolar disorders. Psychiatr Serv. 2007;58(1):85–91.

    Article  PubMed  Google Scholar 

  20. Parker GB, Graham RK, Tavella G. Is there consensus across international evidence-based guidelines for the management of bipolar disorder? Acta Psychiatr Scand. 2017;135(6):515–26.

    Article  CAS  PubMed  Google Scholar 

  21. Yatham LN, Kennedy SH, Parikh SV, Schaffer A, Bond DJ, Frey BN, Sharma V, Goldstein BI, Rej S, Beaulieu S, et al. Canadian Network for Mood and Anxiety Treatments (CANMAT) and International Society for Bipolar Disorders (ISBD) 2018 guidelines for the management of patients with bipolar disorder. Bipolar Disord. 2018;20(2):97–170.

    Article  PubMed  PubMed Central  Google Scholar 

  22. McGirr A, Vohringer PA, Ghaemi SN, Lam RW, Yatham LN. Safety and efficacy of adjunctive second-generation antidepressant therapy with a mood stabiliser or an atypical antipsychotic in acute bipolar depression: a systematic review and meta-analysis of randomised placebo-controlled trials. Lancet Psychiatry. 2016;3(12):1138–46.

    Article  PubMed  Google Scholar 

  23. Howland RH. Induction of mania with serotonin reuptake inhibitors. J Clin Psychopharmacol. 1996;16(6):425–7.

    Article  CAS  PubMed  Google Scholar 

  24. Das AK, Olfson M, Gameroff MJ, Pilowsky DJ, Blanco C, Feder A, Gross R, Neria Y, Lantigua R, Shea S, et al. Screening for bipolar disorder in a primary care practice. JAMA. 2005;293(8):956–63.

    Article  CAS  PubMed  Google Scholar 

  25. Coryell W, Solomon D, Turvey C, Keller M, Leon AC, Endicott J, Schettler P, Judd L, Mueller T. The long-term course of rapid-cycling bipolar disorder. Arch Gen Psychiatry. 2003;60(9):914–20.

    Article  PubMed  Google Scholar 

  26. Carvalho AF, Dimellis D, Gonda X, Vieta E, McLntyre RS, Fountoulakis KN. Rapid cycling in bipolar disorder: a systematic review. J Clin Psychiatry. 2014;75(6):e578–86.

    Article  PubMed  Google Scholar 

  27. Sachs GS, Nierenberg AA, Calabrese JR, Marangell LB, Wisniewski SR, Gyulai L, Friedman ES, Bowden CL, Fossey MD, Ostacher MJ, et al. Effectiveness of adjunctive antidepressant treatment for bipolar depression. N Engl J Med. 2007;356(17):1711–22.

    Article  CAS  PubMed  Google Scholar 

  28. Liu B, Zhang Y, Fang H, Liu J, Liu T, Li L. Efficacy and safety of long-term antidepressant treatment for bipolar disorders - a meta-analysis of randomized controlled trials. J Affect Disord. 2017;223:41–8.

    Article  CAS  PubMed  Google Scholar 

  29. Marangell LB, Dennehy EB, Wisniewski SR, Bauer MS, Miyahara S, Allen MH, Martinez M, Al Jurdi RK, Thase ME. Case-control analyses of the impact of pharmacotherapy on prospectively observed suicide attempts and completed suicides in bipolar disorder: findings from STEP-BD. J Clin Psychiatry. 2008;69(6):916–22.

    Article  PubMed  Google Scholar 

  30. Raja M, Azzoni A, Koukopoulos AE. Psychopharmacological treatment before suicide attempt among patients admitted to a psychiatric intensive care unit. J Affect Disord. 2009;113(1–2):37–44.

    Article  PubMed  Google Scholar 

  31. Yerevanian BI, Koek RJ, Mintz J, Akiskal HS. Bipolar pharmacotherapy and suicidal behavior part 2. The impact of antidepressants. J Affect Disord. 2007;103(1–3):13–21.

    Article  CAS  PubMed  Google Scholar 

  32. Leon AC, Fiedorowicz JG, Solomon DA, Li C, Coryell WH, Endicott J, Fawcett J, Keller MB. Risk of suicidal behavior with antidepressants in bipolar and unipolar disorders. J Clin Psychiatry. 2014;75(7):720–7.

    Article  PubMed  PubMed Central  Google Scholar 

  33. Aizenberg D, Olmer A, Barak Y. Suicide attempts amongst elderly bipolar patients. J Affect Disord. 2006;91(1):91–4.

    Article  PubMed  Google Scholar 

  34. Plans L, Nieto E, Benabarre A, Vieta E. Completed suicide in bipolar disorder patients: a cohort study after first hospitalization. J Affect Disord. 2019;257:340–4.

    Article  PubMed  Google Scholar 

  35. McElroy SL, Kotwal R, Kaneria R, Keck PE Jr. Antidepressants and suicidal behavior in bipolar disorder. Bipolar Disord. 2006;8(5 Pt 2):596–617.

    Article  CAS  PubMed  Google Scholar 

  36. Takeshima M, Oka T. Association between the so-called “activation syndrome” and bipolar II disorder, a related disorder, and bipolar suggestive features in outpatients with depression. J Affect Disord. 2013;151(1):196–202.

    Article  PubMed  Google Scholar 

  37. Perugi G, Pacchiarotti I, Mainardi C, Verdolini N, Menculini G, Barbuti M, Angst J, Azorin JM, Bowden CL, Mosolov S, et al. Patterns of response to antidepressants in major depressive disorder: drug resistance or worsening of depression are associated with a bipolar diathesis. Eur Neuropsychopharmacol. 2019;29(7):825–34.

    Article  CAS  PubMed  Google Scholar 

  38. Bobo WV, Reilly-Harrington NA, Ketter TA, Brody BD, Kinrys G, Kemp DE, Shelton RC, McElroy SL, Sylvia LG, Kocsis JH, et al. Complexity of illness and adjunctive benzodiazepine use in outpatients with bipolar I or II disorder: results from the bipolar CHOICE study. J Clin Psychopharmacol. 2015;35(1):68–74.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  39. Malhi GS, Ivanovski B, Hadzi-Pavlovic D, Mitchell PB, Vieta E, Sachdev P. Neuropsychological deficits and functional impairment in bipolar depression, hypomania and euthymia. Bipolar Disord. 2007;9(1–2):114–25.

    Article  PubMed  Google Scholar 

  40. Barker MJ, Greenwood KM, Jackson M, Crowe SF. Cognitive effects of long-term benzodiazepine use: a meta-analysis. CNS Drugs. 2004;18(1):37–48.

    Article  CAS  PubMed  Google Scholar 

  41. Crowe SF, Stranks EK. The residual medium and long-term cognitive effects of benzodiazepine use: an updated meta-analysis. Arch Clin Neuropsychol. 2018;33(7):901–11.

    Article  PubMed  Google Scholar 

  42. Duan Y, Wei J, Geng W, Jiang J, Zhao X, Li T, Jiang Y, Shi L, Cao J, Zhu G, et al. The effect of short-term use of benzodiazepines on cognitive function of major depressive disorder patients being treated with antidepressants. J Affect Disord. 2019;256:1–7.

    Article  CAS  PubMed  Google Scholar 

  43. De Dios C, Ezquiaga E, Garcia A, Soler B, Vieta E. Time spent with symptoms in a cohort of bipolar disorder outpatients in Spain: a prospective, 18-month follow-up study. J Affect Disord. 2010;125(1–3):74–81.

    Article  PubMed  Google Scholar 

  44. Baldessarini RJ, Leahy L, Arcona S, Gause D, Zhang W, Hennen J. Patterns of psychotropic drug prescription for U.S. patients with diagnoses of bipolar disorders. Psychiatr Serv (Washington, DC). 2007;58(1):85–91.

    Article  Google Scholar 

  45. Mojtabai R, Olfson M. National trends in psychotropic medication polypharmacy in office-based psychiatry. Arch Gen Psychiatry. 2010;67(1):26–36.

    Article  PubMed  Google Scholar 

  46. Merikangas KR, Akiskal HS, Angst J, Greenberg PE, Hirschfeld RM, Petukhova M, Kessler RC. Lifetime and 12-month prevalence of bipolar spectrum disorder in the National Comorbidity Survey replication. Arch Gen Psychiatry. 2007;64(5):543–52.

    Article  PubMed  PubMed Central  Google Scholar 

  47. Judd LL, Akiskal HS, Schettler PJ, Endicott J, Maser J, Solomon DA, Leon AC, Rice JA, Keller MB. The long-term natural history of the weekly symptomatic status of bipolar I disorder. Arch Gen Psychiatry. 2002;59(6):530–7.

    Article  PubMed  Google Scholar 

  48. Judd LL, Akiskal HS, Schettler PJ, Coryell W, Endicott J, Maser JD, Solomon DA, Leon AC, Keller MB. A prospective investigation of the natural history of the long-term weekly symptomatic status of bipolar II disorder. Arch Gen Psychiatry. 2003;60(3):261–9.

    Article  PubMed  Google Scholar 

  49. Sani G, Napoletano F, Vöhringer PA, Sullivan M, Simonetti A, Koukopoulos A, Danese E, Girardi P, Ghaemi N. Mixed depression: clinical features and predictors of its onset associated with antidepressant use. Psychother Psychosom. 2014;83(4):213–21.

    Article  PubMed  Google Scholar 

Download references

Acknowledgments

The authors thank the following psychiatrists belonging to the Japanese Association of Neuro-Psychiatric Clinics: Dr. Kazunori Otaka, Dr. Satoshi Terada, Dr. Tadashi Ito, Dr. Munehide Tani, Dr. Atsushi Satomura, Dr. Hiroshi Sato, Dr. Hideki Nakano, Dr. Yoichi Nakaniwa, Dr. Eiichi Hirayama, Dr. Keiichi Kobatake, Dr. Koji Tanaka, Dr. Mariko Watanabe, Dr. Shiguyuki Uehata, Dr. Asana Yuki, Dr. Nobuko Akagaki, Dr. Michie Sakano, Dr. Akira Matsukubo, Dr. Yukihisa Kibota, Dr. Yasuyuki Inada, Dr. Hiroshi Oyu, Dr. Tsuneo Tsubaki, Dr. Tatsuji Tamura, Dr. Shigeki Akiu, Dr. Atsuhiro Kikuchi, Dr. Keiji Sato, Dr. Toshihiko Lee, Dr. Kazuyuki Fujita, Dr. Fumio Handa, Dr. Hiroyuki Karasawa, Dr. Kazuhiro Nakano, Dr. Kazuhiro Omori, Dr. Seiji Tagawa, Dr. Daisuke Maruno, Dr. Hiroaki Furui, Dr. You Suzuki, Dr. Takeshi Fujita, Dr. Yukimitsu Hoshino, Dr. Kikuko Ota, Dr. Akira Itami, Dr. Kenichi Goto, Dr. Norio Okamoto, Dr. Yoshiaki Yamano, Dr. Kiichiro Koshimune, Dr. Junko Matsushita, Dr. Takatsugu Nakayama, Dr. Kazuyoshi Takamuki, Dr. Nobumichi Sakamoto, Dr. Miho Shimizu, Dr. Muneo Shimura, Dr. Norio Kawase, Dr. Ryouhei Takeda, Dr. Takuya Hirota, Dr. Hideko Fujii, Dr. Riichiro Narabayashi, Dr. Yutaka Fujiwara, Dr. Junkou Sato, Dr. Kazu Kobayashi, Dr. Yuko Urabe, Dr. Miyako Oguru, Dr. Osamu Miura, Dr. Yoshio Ikeda, Dr. Hidemi Sakamoto, Dr. Yosuke Yonezawa, Dr. Makoto Nakamura, Dr. Yoichi Takei, Dr. Toshimasa Sakane, Dr. Kiyoshi Oka, Dr. Kyoko Tsuda, Dr. Yasushi Furuta, Dr. Yoshio Miyauchi, Dr. Keizo Hara, Dr. Misako Sakamoto, Dr. Shigeki Masumoto, Dr. Yasuhiro Kaneda, Dr. Yoshiko Kanbe, Dr. Masayuki Iwai, Dr. Naohisa Waseda, Dr. Nobuhiko Ota, Dr. Takahiro Hiroe, Dr. Ippei Ishii, Dr. Hideki Koyama, Dr. Terunobu Otani, Dr. Osamu Takatsu, Dr. Takashi Ito, Dr. Norihiro Marui, Dr. Toru Takahashi, Dr. Tetsuro Oomori, Dr. Toshihiko Fukuchi, Dr. Kazumichi Egashira, Dr. Shigemitsu Hayashi, Dr. Kiyoshi Kaminishi, Dr. Ryuichi Iwata, Dr. Satoshi Kawaguchi, Dr. Kazuko Miyauchi, Dr. Yoshinori Morimoto, Dr. Kunihiko Kawamura, Dr. Hirohisa Endo, Dr. Yasuo Imai, Dr. Eri Kohno, Dr. Aki Yamamoto, Dr. Naomi Hasegawa, Dr. Sadamu Toki, Dr. Hideyo Yamada, Dr. Hiroyuki Taguchi, Dr. Hiroshi Yamaguchi, Dr. Hiroki Ishikawa, Dr. Sakura Abe, Dr. Kazuhiro Uenoyama, Dr. Kazunori Koike, Dr. Mikako Oyama, Dr. Yoshiko Kamekawa, Dr. Michihito Matsushima, Dr. Ken Ueki, Dr. Sintaro Watanabe, Dr. Tomohide Igata, Dr. Yoshiaki Higashitani, Dr. Eiichi Kitamura, Dr. Junko Sanada, Dr. Takanobu Sasaki, Dr. Kazuko Eto, Dr. Ichiro Nasu, Dr. Kenichiro Sinkawa, Dr. Yukio Oga, Dr. Michio Tabuchi, Dr. Daisuke Tsujimura, Dr. Tokunai Kataoka, Dr. Kyohei Noda, Dr. Nobuhiko Imato, Dr. Ikuko Nitta, Dr. Yoshihiro Maruta, Dr. Satoshi Seura, Dr. Toru Okumura, Dr. Osamu Kino, Dr. Tomoko Ito, Dr. Ryuichi Iwata, Dr. Wataru Konno, Dr. Toshio Nakahara, Dr. Masao Nakahara, Dr. Hiroshi Yamamura, Dr. Masatoshi Teraoka, Dr. Eiichiro Goto, Dr. Masato Nishio, Dr. Miwa Mochizuki, Dr. Tsuneo Saitoh, Dr. Tetsuharu Kikuchi, Dr. Chika Higa, Dr. Hiroshi Sasa, Dr. Yuichi Inoue, Dr. Muneyoshi Yamada, Dr. Yoko Fujioka, Dr. Kuniaki Maekubo, Dr. Hiroaki Jitsuiki, Dr. Toshihito Tsutsumi, Dr. Yasumasa Asanobu, Dr. Seiji Inomata, Dr. Kazuhiro Kodama, Dr. Aikihiro Takai, Dr. Asako Sanae, Dr. Shinichiro Sakurai, Dr. Kazuhide Tanaka, Dr. Masahiko Shido, Dr. Haruhisa Ono, Dr. Wataru Miura, Dr. Yukari Horie, Dr. Tetso Tashiro, Dr. Tomohide Mizuno, Dr. Naohiro Fujikawa, Dr. Hiroshi Terada, Dr. Kenji Taki, Dr. Kyoko Kyotani, Dr. Masataka Hatakoshi, Dr. Katsumi Ikeshita, Dr. Keiji Kaneta, Dr. Ritsu Shikiba, Dr. Tsuyoshi Iijima, Dr. Masaru Yoshimura, Dr. Naoto Adachi, Dr. Masumi Ito, Dr. Shunsuke Murata, Dr. Mio Mori, and Dr. Toshio Yokouchi.

Funding

This study was supported by a Ken Tanaka memorial research grant. The funder had no role in the study design, the data collection and analysis, the decision to publish, or the preparation of the manuscript.

Author information

Authors and Affiliations

  1. Department of Psychiatry, Dokkyo Medical University, School of Medicine, Mibu, Shimotsuga, Tochigi, 321-0293, Japan

    Keita Tokumitsu, Norio Yasui-Furukori & Kazutaka Shimoda

  2. The Japanese Society of Clinical Neuropsychopharmacology, Tokyo, Japan

    Norio Yasui-Furukori, Masaki Kato, Reiji Yoshimura, Atsuo Nakagawa, Toshiaki Kikuchi, Takashi Tsuboi & Koichiro Watanabe

  3. The Japanese Association of Neuro-Psychiatric Clinics, Tokyo, Japan

    Naoto Adachi, Yukihisa Kubota, Yoichiro Watanabe, Kazuhira Miki, Takaharu Azekawa, Koji Edagawa, Eiichi Katsumoto, Seiji Hongo, Eiichiro Goto & Hitoshi Ueda

  4. Department of Neuropsychiatry, Kansai Medical University, Osaka, Japan

    Masaki Kato

  5. Department of Psychiatry, University of Occupational and Environmental Health, Fukuoka, Japan

    Reiji Yoshimura

  6. Department of Neuropsychiatry, Keio University School of Medicine, Tokyo, Japan

    Atsuo Nakagawa & Toshiaki Kikuchi

  7. Department of Neuropsychiatry, Kyorin University School of Medicine, Tokyo, Japan

    Takashi Tsuboi & Koichiro Watanabe

Authors
  1. Keita Tokumitsu
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Norio Yasui-Furukori
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. Naoto Adachi
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. Yukihisa Kubota
    View author publications

    You can also search for this author in PubMed Google Scholar

  5. Yoichiro Watanabe
    View author publications

    You can also search for this author in PubMed Google Scholar

  6. Kazuhira Miki
    View author publications

    You can also search for this author in PubMed Google Scholar

  7. Takaharu Azekawa
    View author publications

    You can also search for this author in PubMed Google Scholar

  8. Koji Edagawa
    View author publications

    You can also search for this author in PubMed Google Scholar

  9. Eiichi Katsumoto
    View author publications

    You can also search for this author in PubMed Google Scholar

  10. Seiji Hongo
    View author publications

    You can also search for this author in PubMed Google Scholar

  11. Eiichiro Goto
    View author publications

    You can also search for this author in PubMed Google Scholar

  12. Hitoshi Ueda
    View author publications

    You can also search for this author in PubMed Google Scholar

  13. Masaki Kato
    View author publications

    You can also search for this author in PubMed Google Scholar

  14. Reiji Yoshimura
    View author publications

    You can also search for this author in PubMed Google Scholar

  15. Atsuo Nakagawa
    View author publications

    You can also search for this author in PubMed Google Scholar

  16. Toshiaki Kikuchi
    View author publications

    You can also search for this author in PubMed Google Scholar

  17. Takashi Tsuboi
    View author publications

    You can also search for this author in PubMed Google Scholar

  18. Kazutaka Shimoda
    View author publications

    You can also search for this author in PubMed Google Scholar

  19. Koichiro Watanabe
    View author publications

    You can also search for this author in PubMed Google Scholar

Contributions

KT analyzed the data and wrote the first draft of the manuscript. KT, NYF, NA, YK, YW, KM, TA, KE, EK, SH, EG, HU, MK, RY, AN, TK, TT, KS and KW contributed to the design of this study. KT, NYF, NA, YK, YW, KM, TA, KE, EK, SH, EG, HU, MK, RY, AN, TK, TT, KS and KW have contributed to and approved the final manuscript.

Corresponding author

Correspondence to Norio Yasui-Furukori.

Ethics declarations

Ethics approval and consent to participate

This study protocol was reviewed and approved by the institutional review board of the ethics committee of the Japanese Association of Neuro-Psychiatric Clinics (ID: 20160822). The administrative permissions and licenses were acquired by our team to access the data used in our research.

Consent for publication

Since this study was a retrospective medical record survey, it was exempted from the requirement for informed consent; however, we instead released information on this research so that patients were free to opt out.

Competing interests

Yasui-Furukori has received grant/research support or honoraria from and has been a speaker for Dainippon-Sumitomo Pharma, Mochida Pharmaceutical, MSD, and Otsuka Pharmaceutical. Shimoda has received research support from Novartis Pharma, Dainippon Sumitomo Pharma, Astellas Pharma, Meiji Seika Pharma, Eisai, Pfizer, Otsuka Pharmaceutical, Daiichi Sankyo, and Takeda Pharmaceutical and honoraria from Eisai, Mitsubishi Tanabe Pharma, Takeda Pharmaceutical, Meiji Seika Pharma, Janssen Pharmaceutical, Shionogi, Dainippon Sumitomo Pharma, Daiichi Sankyo, and Pfizer. Yoshimura has received speaker honoraria from Eli Lilly, Janssen, Dainippon Sumitomo, Otsuka, Meiji, Pfizer and Shionogi. Kato has received grant funding from the Japan Society for the Promotion of Science, SENSHIN Medical Research Foundation and the Japan Research Foundation for Clinical Pharmacology and has received speaker honoraria from Dainippon-Sumitomo Pharma, Otsuka, Meiji-Seika Pharma, Eli Lilly, MSD K.K., GlaxoSmithKline, Pfizer, Janssen Pharmaceutical, Shionogi, Mitsubishi Tanabe Pharma, Takeda Pharmaceutical and Ono Pharmaceutical. Azegawa has received speaker honoraria from Eli Lilly, Otsuka Pharmaceutical, and Pfizer. Ueda has received manuscript fees or speaker honoraria from Eli Lilly, Janssen Pharmaceutical, Meiji Seika Pharma, Mitsubishi Tanabe Pharma, MSD, Otsuka Pharmaceutical, Pfizer, Sumitomo Dainippon Pharma, Takeda Pharmaceutical, and Yoshitomi Yakuhin. Edagawa has received speaker honoraria from Eli Lilly, Meiji Seika Pharma, Mitsubishi Tanabe Pharma, MSD, Otsuka Pharmaceutical, Pfizer, Sumitomo Dainippon Pharma, Kyowa and Yoshitomi Yakuhin. Katsumoto has received speaker honoraria from Daiichi Sankyo, Eisai, Eli Lilly, Janssen Pharmaceutical, Kyowa Pharmaceutical, Meiji Seika Pharma, Mitsubishi Tanabe Pharma, MSD, Otsuka Pharmaceutical, Pfizer, Sumitomo Dainippon Pharma, and UCB. Kubota has received consultant fees from Pfizer and Meiji-Seika Pharma and speaker honoraria from Meiji-Seika Pharma, Eli Lilly, Janssen Pharmaceutical, Dainippon Sumitomo Pharma, Mitsubishi Tanabe Pharma, Yoshitomi Yakuhin, Otsuka Pharmaceutical, and Eisai. Goto has received manuscript fees or speaker honoraria from Eli Lilly, Janssen Pharmaceutical, Meiji Seika Pharma, Mitsubishi Tanabe Pharma, MSD, Otsuka Pharmaceutical, and Sumitomo Dainippon Pharma. Hongo has received manuscript fees or speaker honoraria from Eli Lilly, Janssen Pharmaceutical, Kyowa Pharmaceutical, Meiji Seika Pharma, Mitsubishi Tanabe Pharma, Otsuka Pharmaceutical, Pfizer, Shionogi, Sumitomo Dainippon Pharma, and Yoshitomi Yakuhin. Tsuboi has received consultant fees from Pfizer and speaker honoraria from Eli Lilly, Meiji-Seika Pharma, MSD, Janssen Pharmaceutical, Dainippon Sumitomo Pharma, Mitsubishi Tanabe Pharma, Yoshitomi Yakuhin, Mochida Pharmaceutical, Otsuka Pharmaceutical, Kyowa Pharmaceutical, and Takeda Pharmaceutical. Nakagawa has received lecture fees from Pfizer, Eli Lilly, Otsuka, Janssen Pharmaceutical, Mitsubishi Tanabe, Mochida, Dainippon Sumitomo and NTT Docomo and has served on advisory boards for Takeda, Meiji Seika and Tsumura. Kikuchi has received consultant fees from Takeda Pharmaceutical and the Center for Cognitive Behavioral Therapy and Training. Watanabe has received manuscript fees or speaker honoraria from Daiichi Sankyo, Eisai, Eli Lilly, GlaxoSmithKline, Janssen Pharmaceutical, Kyowa Pharmaceutical, Meiji Seika Pharma, Mitsubishi Tanabe Pharma, MSD, Otsuka Pharmaceutical, Pfizer, Shionogi, Sumitomo Dainippon Pharma, Takeda Pharmaceutical, and Yoshitomi Yakuhin; has received research/grant support from Astellas Pharma, Daiichi Sankyo, Eisai, MSD, Mitsubishi Tanabe Pharma, Meiji Seika Pharma, Otsuka Pharmaceutical, Pfizer, Shionogi, and Sumitomo Dainippon Pharma; and is a consultant for Eisai, Eli Lilly, Kyowa Pharmaceutical, Otsuka Pharmaceutical, Pfizer, Sumitomo Dainippon Pharma, Taisho Toyama Pharmaceutical, and Takeda Pharmaceutical.

Additional information

Publisher’s Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Rights and permissions

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Tokumitsu, K., Yasui-Furukori, N., Adachi, N. et al. Real-world clinical features of and antidepressant prescribing patterns for outpatients with bipolar disorder. BMC Psychiatry 20, 555 (2020). https://doi.org/10.1186/s12888-020-02967-5

Download citation

  • Received:

  • Accepted:

  • Published:

  • DOI: https://doi.org/10.1186/s12888-020-02967-5

Keywords

BMC Psychiatry

ISSN: 1471-244X

Contact us