Merck Receives Approval for BELSOMRA® (suvorexant) C-IV Label Update to Include Findings from Study of Insomnia in Patients with Mild-to-Moderate Alzheimer’s Disease


February 3, 2020 6:30 am ET

KENILWORTH, N.J. — Merck (NYSE: MRK), known as MSD outside the United States and Canada, today announced that the company has received approval from the U.S. Food and Drug Administration (FDA) for an update to the prescribing information for BELSOMRA® (suvorexant) C-IV to include findings on its use for the treatment of insomnia in patients with mild-to-moderate Alzheimer’s disease. BELSOMRA is indicated for the treatment of insomnia characterized by difficulties with sleep onset and/or sleep maintenance.

“Alzheimer’s disease is often accompanied by disruptions to an individual’s sleep-wake patterns and overall difficulty sleeping,” said Dr. W. Joseph Herring, associate vice president, Global Clinical Research, Neuroscience, Merck Research Laboratories. “We’re pleased that the prescribing information for BELSOMRA now includes findings from Merck’s first dedicated study of an insomnia medication in patients with mild-to-moderate Alzheimer’s disease.”

This update includes findings of a randomized, double-blind, placebo-controlled, parallel-group, multi-site 4-week polysomnography trial of BELSOMRA in patients with mild-to-moderate Alzheimer’s disease, which were recently published online in Alzheimer’s & Dementia: Journal of the Alzheimer’s Association. In this study, BELSOMRA exhibited a statistically significant improvement for both Total Sleep Time (TST) and Wake After Sleep Onset (WASO) measures, compared to those treated with placebo, as assessed objectively by polysomnography.

Adverse reactions occurring ≥2% and greater than placebo were somnolence (4% compared to 1% for placebo), dry mouth (2% compared to 1% for placebo), and falls (2% compared to 0% for placebo). Results were originally presented at the 2019 American Academy of Neurology Annual Meeting.

About the Study

The Phase 3 randomized, double-blind, placebo-controlled, parallel-group, multi-site 4-week trial of BELSOMRA was conducted in patients with mild-to-moderate Alzheimer’s disease (n=285) for the treatment of insomnia. Male and female subjects aged 50-90 years (inclusive) were treated with BELSOMRA (n=142) or placebo (n=143). Patients treated with BELSOMRA received 10 mg for approximately 14 days, of whom 77% were increased to 20 mg for approximately 14 additional days.

Insomnia and Alzheimer’s Disease

Insomnia is a sleep disorder that can make it difficult to fall asleep and/or stay asleep, or it can cause people to wake up too early. Many factors contribute to insomnia, including evidence suggesting that wake-promoting signaling overrides sleep-promoting signaling in the brain. Insomnia is more common in people with Alzheimer’s disease than in individuals who do not have Alzheimer’s disease.

About BELSOMRA (suvorexant)

BELSOMRA (suvorexant) is a first-in-class oral orexin receptor antagonist. Orexin is a neurotransmitter found in a specific part of the brain that can help keep a person awake. The mechanism by which BELSOMRA exerts its therapeutic effect is presumed to be through antagonism of orexin receptors.

Indication for BELSOMRA (suvorexant)

BELSOMRA® (suvorexant) is indicated for the treatment of insomnia characterized by difficulties with sleep onset and/or sleep maintenance.

Selected Safety Information for BELSOMRA

BELSOMRA is contraindicated in patients with narcolepsy.

BELSOMRA contains suvorexant, a Schedule IV controlled substance.

BELSOMRA can impair daytime wakefulness. Central nervous system (CNS) depressant effects can last for up to several days after discontinuation.

BELSOMRA can impair driving skills and may increase the risk of falling asleep while driving.  Caution patients taking BELSOMRA 20 mg against next-day driving and other activities requiring full mental alertness.

Coadministration with other CNS depressants increases the risk of CNS depression. Patients should be advised not to consume alcohol in combination with BELSOMRA due to additive effects. Dosage adjustments of BELSOMRA and of other concomitant CNS depressants may be necessary when administered together because of potentially additive effects. The use of BELSOMRA with other drugs to treat insomnia is not recommended.

The risk of next-day impairment, including impaired driving, is increased if BELSOMRA is taken with less than a full night of sleep remaining, if a higher than recommended dose is taken, if coadministered with other CNS depressants, or if coadministered with other drugs that increase blood levels of BELSOMRA. Patients should be cautioned against driving and other activities requiring complete mental alertness if taken in these circumstances.

In clinical studies, a dose-dependent increase in suicidal ideation was observed in patients taking BELSOMRA, as assessed by questionnaire. Immediately evaluate patients with suicidal ideation or any new onset behavioral changes. Suicidal tendencies may be present and intentional overdose is more common in this group of patients. Intentional overdose is more common in this group of patients; therefore, the lowest number of tablets that is feasible should be prescribed for the patient at any one time.

Complex sleep behaviors, including sleep-walking, sleep-driving, and engaging in other activities while not fully awake (eg, preparing and eating food, making phone calls, having sex), have been reported to occur with the use of hypnotics such as BELSOMRA. These events can occur in hypnotic-naïve as well as hypnotic-experienced persons. Patients usually do not remember these events. Complex sleep behaviors may occur following the first or any subsequent use of BELSOMRA, with or without the concomitant use of alcohol and other CNS depressants. Discontinue BELSOMRA immediately if a patient experiences a complex sleep behavior.

Sleep paralysis, hypnagogic/hypnopompic hallucinations, and cataplexy-like symptoms can occur. The risk of cataplexy-like symptoms increases with the dose of BELSOMRA.

The effect of BELSOMRA on respiratory function should be considered.

Reevaluate patients for comorbid conditions if insomnia persists after 7 to 10 days of treatment.

BELSOMRA is not recommended for patients with severe hepatic impairment or those taking a strong CYP3A inhibitor.

In pivotal clinical studies, the most common adverse reaction (reported in 5% or more of patients treated with 15 mg or 20 mg of BELSOMRA and at least twice the placebo rate) was somnolence (BELSOMRA 7%, placebo 3%).

In the insomnia study in patients with mild to moderate Alzheimer’s disease receiving BELSOMRA, the adverse reaction occurring ≥2% and greater than placebo were somnolence (4% compared to 1% placebo), dry mouth (2% compared to 1% placebo), and falls (2% compared to 0% placebo).

Because BELSOMRA can increase drowsiness, patients, particularly the elderly, are at a higher risk of falls.

The recommended dose of BELSOMRA is 5 mg in patients receiving moderate CYP3A inhibitors.

Digoxin levels should be monitored, as slight increases were seen with coadministration of BELSOMRA.

About Merck

For more than a century, Merck, a leading global biopharmaceutical company known as MSD outside of the United States and Canada, has been inventing for life, bringing forward medicines and vaccines for many of the world’s most challenging diseases. Through our prescription medicines, vaccines, biologic therapies and animal health products, we work with customers and operate in more than 140 countries to deliver innovative health solutions. We also demonstrate our commitment to increasing access to health care through far-reaching policies, programs and partnerships. Today, Merck continues to be at the forefront of research to advance the prevention and treatment of diseases that threaten people and communities around the world – including cancer, cardio-metabolic diseases, emerging animal diseases, Alzheimer’s disease and infectious diseases including HIV and Ebola. For more information, visit and connect with us on TwitterFacebookInstagram, YouTube and LinkedIn.

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Please see Prescribing Information for BELSOMRA (suvorexant) at and Patient Information/Medication Guide for BELSOMRA  (suvorexant) at




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