Treatment of chronic insomnia with atypical antipsychotics: results from a follow-up study

Objective Second generation (atypical) antipsychotics are increasingly being used for treatment of insomnia, but there is little evidence to show long-term efficacy of these medication. This follow-up study was designed to assess patients with chronic insomnia who were treated with atypical antipsychotics. Material and Methods In this follow-up study, forty patients with chronic insomnia were evaluated between 2016 and 2018 following after one year of treatment with two atypical antipsychotic drugs of olanzapine and quetiapine in two groups in the sleep disorders research center of Kermanshah University of Medical Science in Iran. The Pittsburgh Sleep Quality Questionnaire (PSQI) and 5 consecutive nights of Actigraphy were utilized to evaluate both subjective and objective measures of sleep quality. Lastly, sleep quality before and after treatment and comparisons of sleep quality between the two groups were performed. Results Nine male participants comprised olanzapine group (n=22) and six male participants comprised the quetiapine group (n=18). The average age in the olanzapine group was 45.23±10.18 and the average age in the quetiapine group was 46.33±7.99. Results showed total PSQI score improved significantly in both groups (p<0.05), while the actigraphy results showed only significant improvement in sleep quality parameters in the quetiapine group (p<0.05). Conclusion Two atypical antipsychotics drugs of olanzapine and quetiapine have long-term efficacy in managing chronic insomnia. More improvements in objective sleep quality with quetiapine is promising for patients with chronic insomnia. Further research to evaluate long-term adverse effects of atypical antipsychotic drugs is recommended.