Which of the following is a common sedative?

Lunesta is the correct answer as it is a well-known sedative, specifically classified as a non-benzodiazepine sleep aid. It is primarily prescribed to help individuals who have difficulty falling asleep or staying asleep throughout the night. Lunesta works by enhancing the effects of a neurotransmitter in the brain that promotes sleep, making it effective for sleep initiation and maintenance.

Understanding the other options provides valuable context. Zanaflex (tizanidine) is a muscle relaxant primarily used to treat muscle spasms, while Robaxin (methocarbamol) is also a muscle relaxant, used similarly for the relief of discomfort associated with acute, painful musculoskeletal conditions. Dexedrine (dextroamphetamine) is a stimulant medication used in the treatment of attention deficit hyperactivity disorder (ADHD) and narcolepsy, which would have the opposite effect of sedation by increasing alertness and energy. These distinctions highlight how Lunesta is specifically recognized for its sedative properties, making it stand out among the choices presented.