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Department of Psychiatry
SUNY at Buffalo Jacobs School of Medicine
Chief Medical Officer
BryLin Behavioral Health System
Buffalo, New York
Sanjay Gupta, MD, has disclosed that he has received consulting fees from Intra-Cellular and fees for non-CME/CE services from AbbVie, Alkermes, Intra-Cellular, Janssen, Neurocrine, Otsuka, and Sunovion.
The availability of 2 FDA-approved agents for the treatment of tardive dyskinesia (TD) has been a tremendous accomplishment for the care of our patients.1 TD was first described by Schonecker in 1957 and had no validated treatments until the approval of valbenazine and deutetrabenazine in 2017.2 We used everything and the kitchen sink to treat this antipsychotic-induced adverse event. Anticholinergic agents (eg, benztropine, trihexyphenidyl) are commonly used to treat TD even at this time, but they cause cognitive and functional impairment in individuals with schizophrenia and increase the risk of delirium in older adults.
More patients with schizophrenia are now receiving second-generation antipsychotics (SGA), and in the United States, there has been a sharp increase in the use of SGAs for the treatment of bipolar disorder whereas use of mood stabilizers and lithium has declined.3,4 In addition, the SGAs (eg, aripiprazole, olanzapine, quetiapine) have been widely used for the augmentation of antidepressants to treat major depressive disorder. Schizophrenia accounts for only 23% of the atypical antipsychotic use in the United States. Data from the National Health and Nutrition Examination Survey 2013-2018 estimated the prevalence of antipsychotic use among US adults was 1.6%. In 2020, it translated into 5 million prescriptions. The rates of TD are lower with SGAs but still stand at 7.2% prevalence with no previous SGA exposure. We expect to see a higher total number of patients with TD due to the high use of antipsychotics, especially in those with mood and anxiety disorders, because these individuals are also at a greater risk of TD.
For treatment-resistant cases, globus pallidus interna deep brain stimulation is level C evidence. There is insufficient evidence for switching from first-generation antipsychotics to SGAs for the treatment of TD (level U) 5.
Clinical Simplicity of Use and Titration
Valbenazine has a simple titration process starting with a dosage of 40 mg/day and increased to 80 mg/day in 7 days, which is the therapeutic dosage. The administration of valbenazine is not dependent on food intake and is dosed once daily. Recently, a 60-mg dose has become available for those who may have tolerability issues with the 80-mg dose of valbenazine. Deutetrabenazine is more complex, needing to be administered with food and twice-daily dosing. The deutetrabenazine is started at 6 mg twice daily with food and increased by 6 mg weekly to a maximum dosage of 24 mg by mouth twice daily.6,7 An ECG is suggested at doses above 24 mg/day.7 The clinical ease of use of valbenazine enhances treatment adherence and suggests valbenazine as the preferred choice for TD treatment.
When deutetrabenazine is dosed >24 mg/day and the patient is receiving concomitant medications known to cause QT prolongation, assess the QT interval before and after increasing the deutetrabenazine dose.8 An ECG should also be done before and after increasing the dosage of the medication known to cause QT prolongation. Most healthcare professionals would do an ECG to be on the safer side, in my opinion.
There are currently no well-designed head-to-head prospective comparison studies between deutetrabenazine and valbenazine. Aggarwal and colleagues9 conducted an indirect treatment comparison (ITC) that allows comparison based on effect size measures. The data for both drugs were compared by trial and dose, and outcomes were analyzed at multiple time points. Valbenazine 40 mg/day was statistically similar to all doses of deutetrabenazine at all time points. The Abnormal Involuntary Movement Scale (AIMS) scores improvement significantly with valbenazine 80 mg/day at 6 weeks v deutetrabenazine 36 mg/day at 8 weeks. The VMAT2 occupancy of deutetrabenazine increases with dosage. The highest VMAT2 occupancy of valbenazine 80 mg/day is higher than deutetrabenazine 48 mg/day. The VMAT occupancy of valbenazine 40 mg/day of is similar to deutetrabenazine 48 mg/day. Based on the indirect treatment comparison, valbenazine is also the preferred choice.
The Cost Factor
The indirect comparison based on treatment over 1 year used 3 outcome measures:
Using the AIMS response, the incremental cost-effectiveness ratio was $9951/quality-adjusted life-years for valbenazine compared with deutetrabenazine. Valbenazine is highly cost-effective for the treatment of TD compared with deutetrabenazine.10
Considering all of the above factors, valbenazine is the preferred choice for treating TD, though there may be some circumstances that make deutetrabenazine the more appropriate choice for the patient. Currently, there are no predictors of a better response to deutetrabenazine or valbenazine.
I would like to hear your opinion about how you approach this issue of choosing between the 2 FDA-approved inhibitors for treating TD in your practice. In addition, I am keen to learn about your experience in using both these agents in your practice. Please recount both the adverse events your patients experience and medication adherence issues that may occur. An interesting observation to report is if TD recurred in those who stopped the VMAT2 inhibitor of their own accord. Finally, I would like to hear about the dosage you are commonly using for valbenazine and deutetrabenazine for the treatment of TD. Please share your experiences and thoughts in the comments box.
Additional resources on this topic can be found here: Evidenced-Based Approaches to Optimally Manage TD.