Suvorexant Reference

Plain English

What it is

Suvorexant (brand name Belsomra) is a prescription sleep medicine for insomnia, meaning trouble falling asleep or staying asleep. It is FDA-approved and is a controlled substance (Schedule IV). It works differently from older sleep drugs: instead of broadly calming the brain, it blocks orexin, a natural signal that keeps you awake.

What people use it for

Doctors prescribe it for adults with insomnia, sometimes for people who did not get good results from other sleep options. It is taken at night to help with falling asleep and staying asleep.

What the science shows

In large studies lasting up to three months, and a separate study lasting a year, it helped people fall asleep and stay asleep better than a dummy pill (placebo). The benefit was real but modest, not dramatic.

The catch

It is available only with a prescription and is a controlled substance. The label warns it can leave you drowsy and impair your driving the next day. It can also cause complex sleep behaviors like sleep-walking or sleep-driving (doing things while not fully awake), sleep paralysis (being briefly unable to move or speak), and dream-like hallucinations.

Reference summary

First dual orexin receptor antagonist (DORA) approved by the FDA. Pivotal evidence is Herring 2016 Biol Psychiatry (two 3-month randomized placebo-controlled trials in adults with primary insomnia) plus Michelson 2014 Lancet Neurol (1-year safety with abrupt-discontinuation follow-up). Both reported modest but reproducible improvements in subjective and polysomnography-measured sleep parameters.

Regulatory and posture

Categories

Sleep

Aliases

Belsomra, MK-4305, Dual orexin receptor antagonist (DORA, small molecule, not a peptide)

Evidence posture

human - Modest effect size; daytime somnolence and next-day driving impairment are documented label warnings.

Regulatory status

FDA-approved as Belsomra (2014) for the treatment of insomnia characterized by difficulties with sleep onset and/or sleep maintenance. Schedule IV controlled substance under the US Controlled Substances Act.

Content review status

label verified