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CNS Depressants: Barbiturates and Benzodiazepines

CNS Depressants: Barbiturates and Benzodiazepines

CNS depressants include drugs from the category of barbiturates and benzodiazepines. They are valuable medications for managing anxiety disorders and insomnia. Barbiturates, once used to induce and maintain sleep, have been replaced mainly by benzodiazepines due to barbiturate's toxicity, tolerance, and overdose risks. They interact with GABAA receptors, leading to sedation at low doses and potentially coma and death at higher doses. Phenobarbital, a long-acting barbiturate, possesses...

Sedatives and Hypnotics Drugs: Benzodiazepines

Sedatives and Hypnotics Drugs: Benzodiazepines

Benzodiazepines have both sedative and hypnotic properties. They include compounds such as diazepam (Valium) and alprazolam (Xanax). Structurally, their cores are similar, consisting of the fusion of a benzene ring and a diazepine ring, but they share a common mechanism of action in the central nervous system (CNS).
Benzodiazepines work by enhancing the effects of the inhibitory neurotransmitter GABA. They bind to the GABAA receptor, increasing its affinity for GABA, which opens chloride...

Anxiolytic Drugs: Benzodiazepines and Buspirone

Anxiolytic Drugs: Benzodiazepines and Buspirone

Benzodiazepines are a class of anxiolytic drugs known for their rapid efficacy and high therapeutic-to-lethal dose ratio, but with a potential risk of drug dependence. These drugs are lipophilic, allowing for rapid absorption after oral administration, eventually reaching the central nervous system (CNS). Once in the CNS, benzodiazepines bind to the allosteric site of the GABAA receptor. This binding enhances the inhibitory effects of the neurotransmitter GABA. By doing so, they prevent...

Sedatives and Hypnotics Drugs: Barbiturates

Sedatives and Hypnotics Drugs: Barbiturates

Sedatives and hypnotics encompass a drug class that acts on the central nervous system (CNS) to alleviate anxiety, promote relaxation and induce sleep.These drugs function by amplifying the actions of the neurotransmitter γ-aminobutyric acid (GABA), resulting in reduced neuronal activity. Barbiturates, a subset of sedatives and hypnotics first synthesized in the late 1800s, are categorized into ultra-short, short, intermediate, and long-acting groups based on their duration of effect. A key...

Anxiolytic Drugs: Overview

Anxiolytic Drugs: Overview

Anxiolytic drugs are vital in managing anxiety disorders by effectively alleviating symptoms such as excessive fear, tachycardia, and tremors. There are several classes of anxiolytic medications, each with unique mechanisms of action and potential side effects.
Primary Types of Anxiolytic Drugs
1. Benzodiazepines:
Benzodiazepines bind to the GABA-A receptor in the brain, enhancing GABA's interaction. This action reduces neurotransmission, effectively blocking anxiety-associated limbic circuitry.

Depressants

Depressants

Depressant drugs, including alcohol and sedative-hypnotics, diminish central nervous system activity by enhancing the action of gamma-aminobutyric acid (GABA), a neurotransmitter that reduces brain activity and promotes relaxation. These substances can have various therapeutic uses but also pose significant risks, especially when misused or combined.
Alcohol is a common depressant that can induce a sense of relaxation and reduced inhibition at low doses. Contrary to its occasional...

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Related Experiment Videos

Self-harm and suicide associated with benzodiazepine usage.

Greg Neale¹, Allan J Smith

¹Liaison psychiatry Department, St. George's Hospital, London. gregneale@btinternet.com

The British Journal of General Practice : the Journal of the Royal College of General Practitioners

|May 17, 2007

Summary

Benzodiazepine dependence can lead to severe physical and psychological withdrawal symptoms. A case report highlights serious self-harm during benzodiazepine regimen changes, particularly with short-acting drugs like lorazepam.

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Area of Science:

Psychiatry
Pharmacology

Background:

Benzodiazepines are frequently prescribed for anxiety and insomnia in primary care.
Dependence and withdrawal symptoms, both physical and psychological, are known risks.
Short-acting benzodiazepines, like lorazepam, may increase complication risks.

Observation:

A previously stable 62-year-old male experienced two episodes of serious self-inflicted stab wounds within one month.
These incidents occurred during adjustments to his prescribed benzodiazepine regimen.

Findings:

The case suggests a potential link between benzodiazepine regimen changes and severe self-harm.
Short-acting benzodiazepines might be associated with a higher risk of such adverse events.

Implications:

This case underscores the critical need for careful monitoring during benzodiazepine treatment adjustments.
It highlights the potential for severe psychiatric complications, including self-harm, related to benzodiazepine dependence and withdrawal.
Further research into the specific risks associated with short-acting benzodiazepines and regimen changes is warranted.