Which of the following is currently the more frequently prescribed group of sedative-hypnotic drugs?

• A. Benzodiazepines
• B. Barbiturates
• C. Z-drugs
• D. Nonbenzodiazepines

Answer: (C)

The main idea here is that modern sedative-hypnotics are favored for sleep because of a safer, more sleep-focused profile. Z-drugs, such as zolpidem, zaleplon, and eszopiclone, are nonbenzodiazepine hypnotics that act on the same GABA-A receptor system but are more selective for receptors linked to sleep. This yields effective sleep promotion with fewer of the extra CNS effects that benzodiazepines provide, like broad anxiolysis, muscle relaxation, or anticonvulsant actions. They generally produce less daytime drowsiness and have shorter half-lives, which reduces next-day impairment and makes them a more convenient option for many patients. Because of these advantages, they have become the more commonly prescribed group for treating insomnia compared with barbiturates (which have higher risk of severe respiratory depression and other toxicities) and even compared with benzodiazepines, whose broader effects come with greater dependence and tolerance concerns. The broader category of nonbenzodiazepines includes other drugs beyond the Z-drugs, but the Z-drugs themselves are the ones most frequently chosen for their sleep-specific, tolerable profile.