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Toxicology – Sources of Sedative–Hypnotic Agents
Sedative–hypnotics are substances that produce calming effects and promote sleep. With repeated use, individuals can develop tolerance, dependence, and addiction. Abrupt discontinuation after prolonged use may result in withdrawal symptoms, and cross-tolerance between agents is common.
Alcohols
Various alcohols—including ethanol, methanol, ethylene glycol, and isopropanol—can produce sedative effects. Methanol and ethylene glycol are particularly dangerous due to toxic metabolite formation, while isopropanol can cause profound central nervous system depression.
Barbiturates
This group includes agents such as phenobarbital, pentobarbital, secobarbital, amobarbital, and butalbital, all of which act as potent central nervous system depressants.
Benzodiazepines
Common examples include diazepam, lorazepam, alprazolam, clonazepam, midazolam, oxazepam, triazolam, chlordiazepoxide, flurazepam, and flunitrazepam. These are widely used for anxiety, sedation, and seizure control.
Chloral Hydrate
Available in both liquid and tablet forms, chloral hydrate can cause significant sedation and may lead to unconsciousness when combined with alcohol. It is also associated with cardiac arrhythmias.
Gamma-Hydroxybutyrate (GHB)
This group includes GHB, gamma-butyrolactone (GBL), and 1,4-butanediol. These substances produce rapid sedation and are sometimes misused recreationally.
Non-Benzodiazepine Sedative-Hypnotics (Sleeping Pills)
Medications such as zolpidem, zaleplon, eszopiclone, and zopiclone are commonly prescribed for insomnia and act on similar pathways as benzodiazepines.
Sedative–hypnotics are substances that produce calming effects and promote sleep. With repeated use, individuals can develop tolerance, dependence, and addiction. Abrupt discontinuation after prolonged use may result in withdrawal symptoms, and cross-tolerance between agents is common.
Alcohols
Various alcohols—including ethanol, methanol, ethylene glycol, and isopropanol—can produce sedative effects. Methanol and ethylene glycol are particularly dangerous due to toxic metabolite formation, while isopropanol can cause profound central nervous system depression.
Barbiturates
This group includes agents such as phenobarbital, pentobarbital, secobarbital, amobarbital, and butalbital, all of which act as potent central nervous system depressants.
Benzodiazepines
Common examples include diazepam, lorazepam, alprazolam, clonazepam, midazolam, oxazepam, triazolam, chlordiazepoxide, flurazepam, and flunitrazepam. These are widely used for anxiety, sedation, and seizure control.
Chloral Hydrate
Available in both liquid and tablet forms, chloral hydrate can cause significant sedation and may lead to unconsciousness when combined with alcohol. It is also associated with cardiac arrhythmias.
Gamma-Hydroxybutyrate (GHB)
This group includes GHB, gamma-butyrolactone (GBL), and 1,4-butanediol. These substances produce rapid sedation and are sometimes misused recreationally.
Non-Benzodiazepine Sedative-Hypnotics (Sleeping Pills)
Medications such as zolpidem, zaleplon, eszopiclone, and zopiclone are commonly prescribed for insomnia and act on similar pathways as benzodiazepines.
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