. Notably, investigators said, the drug comes without the typical metabolic side effects, including weight gain, associated with this drug class.
A post hoc analysis of pooled data from two trials comparing two different doses of cariprazine (Vraylar) to placebo showed it was consistently effective not only in alleviating bipolar depression but also in improving symptoms of anxiety.
“Since this was a post hoc analysis, one has to be careful about not overstating the findings,” said study investigator Roger McIntyre, MD, professor of psychiatry and pharmacology, University of Toronto, Toronto, Ontario, Canada, and head of the Mood Disorders Psychopharmacology Unit.
“But what we can say is that anxiety has been an under-researched, undertreated symptom dimension in BPD, and these findings about cariprazine are very promising,” said Dr. McIntyre, chair and executive director of the Brain and Cognition Discovery Foundation, also in Toronto.
The analysis was published in International Clinical Psychopharmacology) and was presented as a poster at the 2023 Neuroscience Education Institute, Colorado Springs, Colorado.
Ubiquitous, Common, Hazardous
Anxiety in BPD is “ubiquitous, common, and hazardous,” Dr. McIntyre said. “We talk so much about depression and mania as cardinal presentations, but someone could make a case that in that trifecta, we’re missing anxiety.”
In patients with BPD and anxiety, “the index episode is much more difficult to treat, there’s a longer time to remission, lower rates of recovery, and a shorter time to recurrence,” noted Dr. McIntyre, chair of the board of the Depression and Bipolar Support Alliance.
Anxiety also may “represent a portent of other things that can add more to the trouble, like alcohol, illicit drugs, or cannabis use — especially now that cannabis is no longer illegal,” Dr. McIntyre said.
Unfortunately, he said, “there hasn’t been an organized, systematic approach to developing a therapy for anxiety in BPD.” Rather, patients are prescribed benzodiazepines, gabapentinoids, or selective serotonin reuptake inhibitors, all of which have limitations, he added.
Some atypical antipsychotics such as quetiapine have been shown to be helpful with anxiety but “have a lot of baggage and side effects — especially sedation, somnolence, weight gain, and metabolic problems,” Dr. McIntyre noted.
Cariprazine is a dopamine D3-preferring D3/D2 partial agonist, a serotonin 5-HT1A receptor partial agonist, and 5-HT2B receptor antagonist, which has shown anxiolytic-like activity in rodent models.
It was approved by the US Food and Drug Administration to treat mania, depression, and mixed episodes of BPD in 2015 and BPD in 2019.
Dr. McIntyre and his team believed there was an opportunity in the completed randomized controlled trials of cariprazine in BPD to conduct a post hoc analysis of its impact on anxiety.
‘Cornerstone Mood Stabilizer’
The researchers pooled data from two phase 3, randomized, double-blind, placebo-controlled studies in adults with BPD experiencing a current major depressive episode.
The pooled intention-to-treat population consisted of 952 patients with BPD (mean age, ~43 years; 62% female) randomized to receive either 1.5 mg/d, 3 mg/d of cariprazine, or placebo. Patients were divided into two subsets: Lower or higher anxiety (defined as a Hamilton Anxiety Rating Scale [HAM-A] total score of < 18 and ≥ 18, respectively). Patients also completed the Montgomery-Åsberg Rating Scale (MADRS).
A third of the patients received a placebo, a third received the 1.5 mg/d dose, and a third received the 3 mg/d dose. Demographic and baseline characteristics were similar between the subsets.
Results showed there was a statistically significant change in HAM-A total score for cariprazine 1.5 mg/d (P = .0027). The investigators also found a statistically significant change in MADRS total score change for cariprazine 1.5 mg (P = .0200) in the higher anxiety subset. The rate of remission was significantly greater for cariprazine 1.5 mg/d in the higher and lower anxiety subsets (P = .0172 and P = .0004, respectively).
In addition, the change in HAM-A total score change was statistically significant for cariprazine 1.5 mg/d in the higher anxiety subgroup (P = .0105) and the 3 mg/d dose in the lower anxiety subgroup (P = .0441).
Dr. McIntyre hopes these findings can be replicated in other trials.
“Clinically, I find that many patients who take cariprazine don’t require as many benzodiazepines or other medications for anxiety, and it’s one of the better-tolerated medications without metabolic complications or weight gain, so it’s become a cornerstone mood stabilizer,” he said.