Use of a transdermal blonanserin patch significantly improved extrapyramidal symptoms (EPS), compared with oral blonanserin tablets in patients with schizophrenia, according to results of an open-label study of 155 adults.
Blonanserin, a second-generation antipsychotic, has been shown to reduce extrapyramidal symptoms when used to treat schizophrenia, but the impact of switching to a patch on extrapyramidal symptoms and on the use of antiparkinson drugs has not been well studied, Kazutaka Ohi, MD, of Gifu University Graduate School of Medicine, Seki, Japan, and colleagues wrote. Advantages of the patch include the ability to provide stable blood concentrations and the ability to be concealed under clothing to avoid patients’ embarrassment at taking oral medications.
In a study published in Progress in Neuropsychopharmacology & Biological Psychiatry, the researchers identified 155 adults aged 18 years and older diagnosed with schizophrenia who were treated at 37 medical institutions in Japan between February 2015 and May 2017.
The first cohort of 97 patients received blonanserin tablets (8-16 mg/day) for 6 weeks, followed by blonanserin transdermal patches (40-80 mg/day) once daily for 1 year. The second cohort of 58 patients received continuous blonanserin patch therapy. Extrapyramidal symptoms were assessed using the Drug-Induced Extrapyramidal Symptoms Scale (DIEPSS); individual scores ranged from a 0 for normal to a 4 for severe.
Overall, DIEPSS scores decreased significantly in both cohorts after switching from blonanserin tablets or powders to transdermal patches. The average DIEPSS change from baseline at 3, 6, and 12 months was –0.44, –0.07, and –0.14, respectively, in cohort 1, and –0.16, –0.74, and –0.81, respectively, in cohort 2.
The researchers also assessed the impact of transition to transdermal patches on the use of antiparkinsonism drugs using the biperiden equivalents of total antiparkinsonian drugs (BPD-eq) measure. At baseline, about 22% of patients used concomitant antiparkinsonism drugs, compared with 25.8% at 1 year after starting patch treatment. The dose of antiparkinson drugs was not significantly decreased after switching to transdermal patches, in part because of psychiatrists’ prescribing behaviors, Dr. Ohi and colleagues noted.
As a secondary outcome, the researchers examined psychotic symptoms and found that Positive and Negative Syndrome Scale (PANSS) negative symptom scores decreased significantly in patients in cohort 1 who switched from tablets or powders to patches. Changes in scores from baseline to 3, 6, and 12 months were –0.7, –1.0, and –1.3, respectively. Positive PANSS scores did not change significantly in cohort 1. In cohort 2, both positive and negative PANSS scores decreased significantly over 12 months after switching from blonanserin tablets/powders to patches. The mean changes in scores from baseline to 3, 6, and 12 months were –1.6, –2.3, and –2.4, respectively, for PANSS positive symptom scores, and –1.4, –2.7, and –2.8, respectively, for negative symptom scores.
A total of 41.2% of cohort 1 patients and 44.8% of cohort 2 patients discontinued patch treatments by 1 year. Four patients discontinued the patch because of EPS during the treatment period in cohort 1; no patients in cohort 2 discontinued because of EPS.
The study findings were limited by several factors, including the open-label design and lack of controls; also, the study did not examine crossover changes in patients who switched from tablets or powders to patches, the researchers noted.
However, the results indicate that direct switching from blonanserin tablets or powders to transdermal patches reduced EPS and psychotic symptoms in schizophrenia and may be more acceptable to patients, compared with oral medications, as well as more effective, they concluded.
The study received no outside funding, and Dr. Ohi and colleagues had no disclosures.