In a recent study comparing the efficacy of lithium and the second-generation antipsychotic quetiapine, the drugs had remarkably similar results. Researcher Andrew Nierenberg et al. presented the results at the 2014 meeting of the American Society of Clinical Psychopharmacology. In the 6-month study called CHOICE (Clinical Health Outcome Initiative Comparative Effectiveness), 482 patients received either lithium or quetiapine in addition to other medications in a manner consistent with clinical practice. For the purposes of the study, those receiving lithium could not receive quetiapine or another antipsychotic, and those receiving quetiapine could not receive lithium or another antipsychotic, but both groups could receive other types of adjunctive medications.
By the end of the 6-month study period, most patients had improved substantially, but only about a quarter of each group became truly well. The researchers suggest that patients may need a longer period of treatment or other interventions such as psychotherapy or combination treatment. Clinicians were told to use the maximum dose of lithium or quetiapine that each patient could tolerate. Mean maximum doses were 1007.5mg of lithium and 344.9mg of quetiapine.
One surprise for the researchers was that 24% of lithium patients and 27% of quetiapine patients required no other medications and improved on monotherapy.
While results were very similar for two drugs, lithium produced slightly greater side effects and produced slightly better results in patients with anxiety. This may have been due to those patients also receiving benzodiazepines, and the researchers are analyzing data to see whether the patients with anxiety did indeed receive this kind of adjunctive treatment. Quetiapine was slightly better in patients who had more manic symptoms.
In another surprise finding, patients with bipolar II disorder fared better overall than patients with bipolar I disorder. Patients with higher suicide risk did worse than those with lower suicide risk.
Willem Nolen, a researcher who has spent 40 years studying unipolar and bipolar disorder, recently retired from his position at Groningen Hospital in the Netherlands. In February, his retirement was celebrated with a symposium where he and other researchers discussed some of their important findings from the last several decades.
Nolen recently published a double-blind randomized study showing that in patients who were initially responsive to monotherapy with quetiapine (Seroquel), continuing the drug (at doses of 300-800mg/night) or switching to lithium were both more effective than switching to placebo over 72 weeks of long-term follow-up.
This study shows that quetiapine, which is only FDA-approved for long-term preventative treatment when used in combination with lithium or valproate (Depakote), also has efficacy when used as monotherapy.
Lithium is Highly Effective in Long-term Prevention
Nolen’s work also adds to an impressive amount of literature showing that lithium is highly effective in long-term prevention. This case is especially noteworthy because lithium was effective even in patients who had initially been selected for their response to quetiapine. (Studies that use this kind of “enriched sample” can only claim that quetiapine has long-term efficacy in those patients who initially respond well to the drug.) The data on lithium are even more impressive since the patients in this study were not enriched for lithium response.
Nolen has also conducted multiple studies of lithium, but optimal doses and target blood levels of the drug remain controversial. The therapeutic range of lithium is usually considered to be 0.6 to 1.2 meq/L, but some have argued that lower levels may still be effective. In a new analysis of those patients in the quetiapine study who were switched to lithium treatment, Nolen found that only lithium levels above 0.6 meq/L produced better results than placebo in long-term prophylaxis. Read more
An article published by Weisler et al. last year in the Journal of Clinical Psychiatry suggests that quetiapine may be effective as a monotherapy maintenance treatment for bipolar I disorder. It has previously been shown to work in combination with lithium or divalproex and is approved by the Federal Drug Administration for this combination treatment.
Adult patients diagnosed with bipolar I disorder who were currently or recently in a mood episode received open-label quetiapine in doses of 300-800mg per day for up to 24 weeks. Patients who became stable either remained on quetiapine or were switched to lithium (at doses of 0.6-1.2 mEq/L) or placebo. This double-blind phase of the study continued for up to 104 weeks.
The study began with 2,438 patients, 1,172 of whom made it to the second phase of the trial. On the main outcome measure of time to recurrence of any mood event, both quetiapine and lithium were significantly better than placebo.
Editor’s Note: In the 50% of patients with a recent mood episode who were able to be stabilized on quetiapine monotherapy, those who remained on long-term quetiapine or those who switched to lithium were both much less likely to have subsequent relapses into either depression or mania than those who switched to placebo. Whether Astra-Zeneca, the company that produces quetiapine, will file to gain Federal Drug Administration approval of quetiapine monotherapy for long-term preventive treatment is not known.
Gagan Joshi performed an 8-week open study of quetiapine in 30 preschool children and 19 school-age children. The mean dose was 176 mg/day on average for the preschool children, and 248 mg/day for the school age children, and both appeared highly effective in treating manic symptomatology. At the 57th Annual Meeting of the American Academy of Child and Adolescent Psychiatry (AACAP) in October 2010, Joshi reported that while the drug was generally well tolerated, it was associated with significant weight gain; the preschoolers gained 3.1 lbs on average in the 8-week period, while the school age children gained an average of 7.4 lbs.
New Atypical Antipsychotic Lurasidone Appears To Improve Schizophrenia Without Weight-Gain Side Effects
A study by a research group that included Antony Loebel of pharmaceutical company Sunovion; Steven Potkin of the University of California, Irvine; and Herbert Meltzer from Vanderbilt University summarizes data on a new atypical antipsychotic FDA-approved for treatment of schizophrenia. This agent, lurasidone (Latuda), was studied in a double-blind, placebo-controlled six-week trial in patients with schizophrenia.
The drug is a new psychotropic agent that has a high affinity for dopamine D2 receptors and serotonin 5HT2A, 5HT1A, and 5HT7 receptors. (New data suggest that antagonistic effects on 5HT7 receptors may be related to antidepressant efficacy.)
In the study, patients were randomized to receive lurasidone at 80mg/day, lurasidone at 160mg/day, quetiapine XR at 600mg/day, or placebo. Evening dosing was used. Both dose levels of lurasidone resulted in significant degrees of improvement compared with quetiapine XR and placebo.
The side effects profile for lurasidone was also promising; patients were no more likely to gain weight on lurasidone than on placebo, while there was a mean 2kg weight increase on quetiapine XR. In addition, total cholesterol and triglycerides on both doses of lurasidone were similar to that on placebo, in contrast to small but significant increases on quetiapine XR.
There were significant increases in levels of prolactin (a hormone related to lactation, sex function, and bone demineralization) on lurasidone at both 80mg (+ 0.8mg/dl) and 160mg (+ 3mg/dl), while small decreases in prolactin were observed on quetiapine XR (-0.3 mg/dl) and on placebo (-0.8 mg/dl).
The data suggest that lurasidone is effective in the treatment of patients with acute exacerbation of schizophrenia, with significant effects occurring as early as day 4. This study had a low rate of adverse events. Read more
Anil Malhotra from the Zucker Hillside Hospital found that pramipexole (Mirapex), a dopamine D2 and D3 agonist used in the treatment of Parkinson’s disease, improved measures of processing speed and working memory in euthymic bipolar patients (whose average age was 42) when compared with placebo in an adjunctive clinical trial.
Editor’s Note: Bipolar patients in a euthymic phase have consistently been shown to have some degree of cognitive dysfunction that is typically correlated with the number of prior depressive and/or manic episodes they have experienced. This is one of the first studies to directly target this cognitive dysfunction with a pharmacotherapeutic agent.
Pramipexole may be of additional value among depressed patients, because in two small, placebo-controlled studies, one led by Carlos Zarate at the National Institute of Mental Health and one led by Joseph F. Goldberg in New York, pramipexole has been shown to exert acute antidepressant effects in bipolar patients in the depressive phase of the illness. The new data from Malhotra raise the possibility that there could be a two-for-one benefit when pramipexole is used in the depressive phase of bipolar illness—improvement in both depression and cognition.
Other approaches to improving cognition in patients with bipolar disorder
Psychotherapy and psychoeducational approaches, long-term psychopharmacology, and combination therapy all play a role in preventing recurrent mood episodes.
Psychotherapeutic and Psychoeducational Approaches Are Critical
A number of studies presented at the 4th Biennial Conference of the International Society for Bipolar Disorders in Sao Paulo, Brazil in March indicated that cognitive-behavioral therapy (CBT) and individual and group psychoeducational approaches enhance both short- and long-term outcomes for patients with bipolar illness. These studies add to an already substantial literature that shows that focused psychotherapies (such as cognitive/behavioral, interpersonal, and social rhythms therapies) and psychoeducation are superior to treatment as usual.
These therapies can provide a variety of approaches to stress management and reduction, and can enhance family and interpersonal communication. Another way these focused psychotherapeutic approaches help patients is by demonstrating the benefits of effective long-term preventive treatment and encouraging its consistent use.
Without consistent prophylactic treatment, patients are at high risk for recurrences and their subsequent psychosocial and neurobiological consequences. Greater number of prior episodes is associated with an increased risk of psychosocial dysfunction, treatment resistance, cognitive dysfunction, medical comorbidities, and even dementia in old age.
After the jump: preventive psychopharmacology and combination therapy. Read more
EDITOR’S NOTE: Dr. Gagin Joshi of Massachusetts General Hospital, who presented the work on carbamazepine and lamotrigine on page 1 provided us with his own general treatment algorithm for youngsters with bipolar disorder.
Joshi typically starts with 0.5 to 2 gms of omega-3 fatty acids because of their benign side-effects profile, the many studies suggesting they are effective in adult mood disorders, and a recent article indicating that they were effective in preventing the conversion of prodromal schizophrenia into full-blown illness in a randomized double-blind controlled study in Australia.
After the omega-3 fatty acids, Joshi’s second choice is typically the atypical antipsychotic aripiprazole (Abilify) because of its lesser degree of weight gain compared to atypicals quetiapine (Seroquel) or risperidone (Risperidol). Risperidone can be a third option if aripiprazole is not effective or tolerated.
The atypical antipsychotic quetiapine (Seroquel or Seroquel XR) has a range of efficacy in a number of illnesses, depending on the size of the dose given. Read about some of its uses below, including as an adjunct to antidepressants in unipolar depression; as a treatment for generalized anxiety disorder (GAD) and post-traumatic stress disorder (PTSD); and, at higher doses, as a treatment for mania and depression. Some of its potential mechanisms of action are described as well.
Quetiapine as an adjunct to antidepressants in unipolar depression
Posters at the American Psychiatric Association meeting in San Francisco in May 2009 showed new data from a series of studies of quetiapine in unipolar depression that showed the drug in monotherapy (at 150mg & 300mg) was significantly more effective than placebo. Studies were also positive when quetiapine was used as an adjunct compared with placebo for patients showing inadequate or incomplete responses to antidepressants such as selective serotonin reuptake inhibitors (SSRIs).
Generalized anxiety disorder (GAD) is a prevalent illness often associated with considerable discomfort and dysfunction. It often co-occurs with bipolar disorder. Traditional treatments of the primary syndrome (occurring in the absence of bipolar disorder) involve serotonin-selective antidepressants and serotonin-noradrenergic reuptake inhibitors such as venlafaxine (Effexor) or duloxitine (Cymbalta). While these are often useful and lead to considerable improvement, they often do not lead to full remission of somatic or accompanying symptoms of insomnia.
Alternative treatment possibilities include the anticonvulsant pregabalin (Lyrica), which has been found effective in four placebo-controlled studies in GAD. A poster presentation by Joshi et al. at the American Psychiatric Association meeting in San Francisco in May 2009 also reported that pregabalin was more effective in reducing sleep disturbance than venlafaxine. Pregabaline is FDA-approved for seizures and fibromyalgia, but not for GAD or pain syndromes. Another treatment possibility is quetiapine (Seroquel), where not only have there been positive efficacy in placebo-controlled studies of patients with GAD, but the patients also experienced improvement in sleep.