Lunesta 3 mg, containing the active ingredient eszopiclone, is a prescription sleep medication commonly used for the treatment of insomnia in adults. It belongs to the non-benzodiazepine sedative-hypnotic class, often referred to as “Z-drugs,” which are designed to help promote sleep with potentially fewer side effects than older sedative medications. The 3 mg strength is the highest standard dose of Lunesta and is typically prescribed for individuals who require significant support in both falling asleep and staying asleep throughout the night.