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Lemborexant for insomnia

Current Psychiatry. 2020 November;19(11):43-49 | doi:10.12788/cp.0060

References

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Metabolism is primarily through the cytochrome P450 (CYP) 3A4 pathway, and to a lesser extent through CYP3A5. Concomitant use with moderate or strong CYP3A inhibitors or inducers should be avoided, while use with weak CYP3A inhibitors should be limited to the 5-mg dose of lemborexant.

Lemborexant has the potential to induce the metabolism of CYP2B6 substrates, such as bupropion and methadone, possibly leading to reduced efficacy for these medications. Accordingly, the clinical responses to any CYP2B6 substrates should be monitored and dosage adjustments considered.

Concomitant use of lemborexant with alcohol should be avoided because there may be increased impairment in postural stability and memory, in part due to increases in the medication’s C_max and AUC, as well as the direct effects of alcohol.

Efficacy

In randomized, placebo-controlled trials, lemborexant demonstrated both objective and subjective evidence of clinically significant benefits for sleep onset and sleep maintenance in patients diagnosed with insomnia disorder.¹ The 2 pivotal efficacy studies were:

Sunrise 1, a 4-week trial with older adults that included laboratory polysomnography (PSG) studies (objective) and patient-reported sleep measures (subjective) on selected nights⁹
Sunrise 2, a 6-month trial assessing patient-reported sleep characteristics in adults and older adults.¹⁰

Sunrise 1 was performed with older adults with insomnia who were randomized to groups with nightly use of lemborexant, 5 mg (n = 266), lemborexant, 10 mg (n = 269), zolpidem extended-release, 6.25 mg, as an active comparator (n = 263), or placebo (n = 208).⁹ The age range was 55 to 88 years with a median age of 63 years. Most patients (86.4%) were women. Because this study focused on the assessment of efficacy for treating sleep maintenance difficulty, the inclusion criteria required a subjective report of experiencing a wake time after sleep onset (sWASO) of at least 60 minutes for 3 or more nights per week over the previous 4 weeks. The zolpidem extended-release 6.25 mg comparison was chosen because it has an indication for sleep maintenance insomnia with this recommended dose for older adults.

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Lemborexant for insomnia

References

Efficacy

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