Fan the flame: trazodone-induced mania in a unipolar depressed patient with stable sertraline treatment

Abstract

Depressed patients often complain of sleep disturbance. Routine antidepressive strategies sometimes fail to deal with this intractable issue. Indeed, the supplementation of sleep promoting antidepressants (eg, trazodone, mirtazapine, and agomelatine) is prevalent in clinical practice. However, the combination of different antidepressants may increase the affective lability. Herein, we document a patient with unipolar depression who was compliant with sertraline treatment and who dramatically switched to mania after adding trazodone as a sleeping aid. This case extended our understanding of the potential manic-switching risk when trazodone is used to promote sleep.

Introduction

Difficulty in initiating or maintaining sleep is not uncommon among patients with affective disorders.¹ Comorbid insomnia is associated with severe psychiatric symptoms and significantly impairs the quality of life.^1,2 Nevertheless, typical antidepressants (eg, selective serotonin reuptake inhibitors and serotonin-norepinephrine reuptake inhibitors) can help to improve the mood, but sometimes fail to handle the sleep problem properly.^1,3

As was shown in a recent large-scale survey, off-label use of trazodone for insomnia accounted for nearly a quarter of all off-label antidepressant use.⁴ However, the potential risk associated with off-label trazodone use received limited attention. Furthermore, due to weak evidence of the outcome and appropriateness, the use of trazodone for sleep onset and maintenance difficulties in adult patients was not recommended by the recently updated guidelines of American Academy of Sleep Medicine.⁵

According to published data, common adverse events of trazodone are gastrointestinal, cardiovascular, and neurologic effects.⁶ As an antidepressant approved by the US Food and Drug Administration, the risk of trazodone inducing manic-switching was relatively low in patients with bipolar disorder when coprescribed with mood stabilizers.⁷ To date, there are sparse cases of trazodone-induced mania reported, mostly in patients with predisposing factors.⁷ Herein, we present a middle-aged male patient with unipolar depression who was in remission with compliance to sertraline treatment and switched to mania after adding trazodone to promote sleep.

Case presentation

A 36-year-old male patient was taken to our hospital by his family members because of elevated mood and aggressive behaviors. His medical history was collected by detailed inquiry. In his early adolescence, the patient experienced his first episode of depression, which was ascribed to the bad relationship between his parents. Since then, he complained that his mood had swung frequently, with declined interest in daily activities and loss of appetite. This patient condemned himself as solitary, endocentric, and cowardly. He had been a Christian for approximately 10 years. After graduating from university, he worked as a physics teacher in a local high school. His job performance at school was proficient. Not until this patient heard of health education on mental illnesses did he first come to a local clinic for psychiatric counseling (nearly 8 months prior to admission). On that occasion, he complained of feeling upset, irritable, and fatigued. He was diagnosed with generalized anxiety disorder and was prescribed tandospirone and propranolol. Nonetheless, these regimens were discontinued by the patient after 2 weeks because of the unsatisfactory outcome. He then visited our hospital and the psychiatrist revised the diagnosis to major depressive disorder. He was given sertraline at a dose of 100 mg/day. About 2 months after initiating sertraline treatment, this patient still felt depressed and was not interested in daily activities. The dose of sertraline was, therefore, increased into 150 mg/day. From then on, our patient had felt at ease with sertraline treatment for nearly 4 months. His performance at work and interpersonal relationships also improved.

About 1 week prior to admission, the patient revisited our hospital and complained of waking up early in the morning, however his emotional state was stable. Trazodone at a dose of 25 mg/night was added to promote sleep. He felt extremely excited after taking trazodone for the first time; he slept only 2 hours that night, and became talkative and conceited. In the following 2 days, he continued to take trazodone, however on day 3 he discontinued trazodone due to abnormal behavior. He preached Christianity during his class which was forbidden according to the school disciplines. He even sent emails to the White House to seek protection. Also, our patient professed that he was conferred superpowers by God. The day before admission, the patient felt that he was possessed by a supernatural spirit and was told to save the world before the coming doomsday. He abused his superiors at a public occasion because of their insincerity. Consequently, he was sent to our hospital for management.

On admission, the patient could not stop talking and asserted the ability to understand the inner world of others. An extensive physical examination revealed no neurological deficits. No substance abuse or toxin exposure was reported. Laboratory screenings, including routine analysis of blood, urine, stool, biochemistry, thyroid hormones, coagulation function, C-reactive protein, cortisol, adrenocorticotropic hormone, tumor and infectious biomarkers, were all within the normal limits. Cranial magnetic resonance scanning was also normal. The patient was diagnosed with bipolar I disorder, manic episode, according to the Diagnostic and Statistical Manual of Mental Disorders, 5th edition. Quetiapine was gradually titrated to 700 mg per night over 1 week accompanied with 5 mg of haloperidol twice a day for 5 consecutive days. His emotional state gradually stabilized after about 2 weeks of hospitalization. After discharging from hospital, the patient took quetiapine 700 mg every night and remained euthymic during outpatient follow-ups.

Ethics

This case study obtained approval from the Institute Ethical Committee of the First Affiliated Hospital, Zhejiang University School of Medicine. The patient and his family members signed informed consent to publish case details.

Discussion

We present an interesting case in which a small dose of trazodone augmentation to sertraline treatment dramatically induced mood-switching. Of note, trazodone was used as a hypnotic agent in our patient. Given its massive use in the general population, this case study is of practical importance when coprescribing trazodone with other antidepressants.

As a serotonin receptor antagonist and serotonin reuptake inhibitor (SARI), trazodone was classically used as an antidepressant agent. Nevertheless, off-label use of trazodone is commonly found in patients with various medical conditions, including anxiety disorder, obsessive-compulsive disorder, substance use disorder, eating disorder, sexual dysfunction, and certain pain conditions.⁶ Besides, trazodone is often used to cope with insomnia in clinical practice.^4,8 Two mechanisms may underlie the sleep-enhancing effects of trazodone, including the blockage of serotonergic 5-HT_2A receptors and histamine H₁ receptors.⁹ It is noteworthy that off-label use of trazodone should be cautiously evaluated on the basis of individual differences.

To date, less than 20 cases of manic-switching associated with trazodone treatment have been documented.⁷ According to the literature review, these patients were diagnosed with either unipolar depression or bipolar disorder.⁷ The daily dose of trazodone ranged from 50 mg to 400 mg.⁷ It was interesting that these patients were treated with trazodone monotherapy or in combination with other antidepressants, and none of them were coadministered with mood stabilizers. The onset of manic-switching time following trazodone treatment varied from 4 days to 4 weeks.⁷ Of note, these mania events can be well-controlled with cessation or reduction of trazodone, administration of haloperidol, or adding mood stabilizers.⁷ As for our patient, there were three main differences from the aforementioned reports, including the low dose of trazodone (25 mg per night), the rapid onset of mania (the first night of taking trazodone), and the coprescribed antidepressant sertraline (none of the previous cases were associated with sertraline).

In the view of pharmacokinetics, the in vivo metabolism of trazodone was predominantly via CYP3A4 enzyme and relatively less via CYP2D6 enzyme.^10,11 Notably, these two cytochrome 450 isotypes were also involved in the metabolism of sertraline.¹² Therefore, addition of trazodone as a sleeping aid may increase the serum concentration of sertraline, and further interfere with the balance of neurotransmitter systems. However, other explanations for the manic behaviors in our patient should also be taken into consideration. It has been reported that almost 8% of patients with a diagnosis of unipolar depression may encounter mood-switching when taking antidepressants.¹³ For our patient, some manifestations prior to the manic episode, such as mood instability and irritability, may indicate an unrecognized or potential condition of bipolar disorder. We should pay attention to the new-onset insomnia prior to the manic episode. The symptom of insomnia could be secondary to depression, or a trigger of manic episode, or even an initial manifestation of an evolving manic episode. Therefore, clinicians should carefully evaluate every symptom in depressed patients, especially the risk factors for bipolar disorder, before formulating the pharmacological strategy. Moreover, although manic-switching was an unwanted adverse effect to our patient, an important lesson can be learned that trazodone can be used to augment the efficacy of other antidepressants, especially in patients with sleep problems. This perspective was in accordance with another case study, in which addition of trazodone as a third antidepressant to paroxetine and mirtazapine successfully eased the symptoms of depressed mood and insomnia in a patient with treatment-resistant depression.¹⁴ However, safety, tolerance, and efficacy of adding trazodone to other antidepressants should be observed in future investigations.

Conclusion

We present a scenario of trazodone-induced mania in a depressed patient with compliance to sertraline treatment. This case indicated that when using trazodone as a hypnotic agent close monitoring was necessary to evaluate the potential risk of manic-switching, especially in the early stage of therapy.