Chemical structure of the prototypical Z-drug
zolpidem.
Z-drugs are a group of nonbenzodiazepine drugs with effects similar to benzodiazepines which are used in the treatment of insomnia,[1] and whose names mostly start with the letter "Z". Some Z drugs may have advantages over benzodiazepines. Benzodiazepines actually worsen sleep architecture whereas the Z drug zaleplon (Sonata) may have less or no disruption of sleep architecture.[2]
History [edit]
Z drugs emerged in the last years of the 1980s and early 1990s, with zopiclone (Imovane) approved by the NHS as early as 1989, quickly followed by Sanofi and zolpidem (Ambien). By 1999, King Pharmaceuticals had finalized approval with the FDA to market zaleplon (Sonata, Starnoc). In 2005, the FDA approved a variant on zopiclone, by approving Sepracor to market the (S)-enantiomer, eszopiclone (Lunesta). That same year, 2005, the FDA finalized approval for Ambien CR, or extended-release zolpidem. Most recently, in 2012 the FDA approved Intermezzo which still utilizes zolpidem as its active ingredient, but is marketed for middle-of-the-night insomnia, available in doses only half of the strength of, immediate-release Ambien to avoid residual next day sedation.
Pharmacology [edit]
There are three primary groups of Z drugs, all of which can be labeled nonbenzodiazepines. Listed below are three distinct groups of CNS sedative-hypnotics:
All of these groups are believed to modulate benzodiazepine (BZP) specific sub unit sites, as specific agonists of GABA-A receptors. It is thought, that the primary mode of action utilized by Z drugs is selective, and carries a high affinity for the a1, hypnotic inducing site, on the BZP sub unit, within GABA-A receptors.
See also [edit]
References [edit]
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Canabinoids |
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Depressants |
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Stimulants |
General
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Releasing agents (RA)
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Entactogens |
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Hallucinogens |
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GABAA
agonists/PAMs |
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GABAB
agonists |
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H1 inverse
agonists |
Antihistamines: Captodiame • Cyproheptadine • Diphenhydramine • Doxylamine • Hydroxyzine • Methapyrilene • Pheniramine • Promethazine • Propiomazine
Antidepressants: Tricyclic antidepressants ( Amitriptyline, Doxepin, Trimipramine, etc.) • Tetracyclic antidepressants ( Mianserin, Mirtazapine, etc.)
Antipsychotics: Typical antipsychotics ( Chlorpromazine, Thioridazine, etc.) • Atypical antipsychotics ( Olanzapine, Quetiapine, Risperidone, etc.)
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α1-Adrenergic
antagonists |
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α2-Adrenergic
agonists |
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5-HT2A
antagonists |
Antidepressants: Serotonin antagonists and reuptake inhibitors ( Trazodone) • Tricyclic antidepressants ( Amitriptyline, Doxepin, Trimipramine, etc.) • Tetracyclic antidepressants ( Mianserin, Mirtazapine, etc.)
Antipsychotics: Typical antipsychotics ( Chlorpromazine, Thioridazine, etc.) • Atypical antipsychotics ( Olanzapine, Quetiapine, Risperidone, etc.)
Others: Eplivanserin • Niaprazine • Pruvanserin • Volinanserin
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Melatonin
agonists |
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Orexin
antagonists |
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Others |
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