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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...

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.

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...

Sedatives and Hypnotics: Overview

Sedatives and Hypnotics: Overview

Sedatives are drugs that alleviate anxiety, while hypnotics induce sleep. Both classes of medication suppress neuronal activity, leading to a calming effect for sedatives and facilitating sleep for hypnotics.
Sedative-hypnotics are categorized into barbiturates, benzodiazepines (BZDs), and non-benzodiazepines or Z-drugs. These drugs work by suppressing central nervous system activity, and this suppression is dose-dependent. Older sedative medications, like barbiturates, follow a linear curve in...

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Related Experiment Video

Updated: Jun 27, 2026

Meta-Analysis of the Effectiveness and Safety of Shugan Jieyu Capsules for the Treatment of Insomnia

Meta-Analysis of the Effectiveness and Safety of Shugan Jieyu Capsules for the Treatment of Insomnia

Published on: February 17, 2023

Withdrawing benzodiazepines in primary care.

Malcolm Lader¹, Andre Tylee, John Donoghue

¹Institute of Psychiatry, King's College London, London, England. m.lader@iop.kcl.ac.uk

|December 10, 2008

Summary

Long-term benzodiazepine use is controversial due to adverse effects and questionable effectiveness. Discontinuation improves functioning, especially in the elderly, and strategies focus on primary care interventions and gradual tapering.

Area of Science:

Pharmacology
Psychiatry
General Practice

Background:

Long-term benzodiazepine use is controversial, with differing expert and international views on its problematic nature.
Adverse effects are well-documented, and effectiveness is increasingly questioned, necessitating a review of long-term users for discontinuation.
The emergence of Selective Serotonin Reuptake Inhibitors (SSRIs) and melatonin agonists offers alternative treatments for anxiety and insomnia, respectively.

Purpose of the Study:

To review evaluated discontinuation strategies for long-term benzodiazepine users, focusing on pharmacological interventions.
To highlight the imperative for reviewing long-term benzodiazepine users regarding possible discontinuation.
To discuss the roles of primary care practitioners and pharmacists in managing benzodiazepine withdrawal.

Related Experiment Videos

Last Updated: Jun 27, 2026

Meta-Analysis of the Effectiveness and Safety of Shugan Jieyu Capsules for the Treatment of Insomnia

Meta-Analysis of the Effectiveness and Safety of Shugan Jieyu Capsules for the Treatment of Insomnia

Published on: February 17, 2023

Main Methods:

Review of pharmacological interventions, including adjunctive medications like carbamazepine and antidepressants.
Examination of psychological interventions such as counseling and cognitive-behavioral therapy (CBT).
Analysis of discontinuation strategies, emphasizing gradual tapering over abrupt cessation and suggesting a withdrawal timeline.

Main Results:

Carbamazepine showed potential adjunctive properties, but data are insufficient for recommendations.
Antidepressants can be beneficial for concurrent depression during withdrawal.
Gradual tapering over less than six months is recommended to avoid prolonged withdrawal processes.

Conclusions:

Successful benzodiazepine withdrawal leads to improved functioning and abstinence, with economic benefits.
Primary care practitioners are key in initiating discontinuation strategies.
Cognitive-behavioral therapy (CBT) appears effective in preventing relapse after withdrawal.