Barbiturates
Barbiturates - Related Videos
01:20
Sedatives and Hypnotics Drugs: Barbiturates
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2024
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...
01:14
CNS Depressants: Barbiturates and Benzodiazepines
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2024
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...
07:34
A Simple Stimulatory Device for Evoking Point-like Tactile Stimuli: A Searchlight for LFP to Spike Transitions
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Cited by 4 •
2014
To elucidate the complex transition from Local Field Potentials (LFPs) to spikes a suitable stimulator for light mechanical peripheral stimuli was built. As an application, the spiking activities recorded from somatosensory cortex were analyzed by a multi-objective optimization strategy. The results demonstrated that the proposed stimulator was able to deliver tactile stimuli with millisecond and millimeter precisions.
FAQs
Barbiturates enhance GABA type A receptor activity primarily by increasing the duration of chloride channel opening. Chloride entry hyperpolarizes neurons, making them less likely to become excited. At higher concentrations, these drugs can directly activate the channels, adding a mechanism that helps explain why increasing exposure can produce progressively deeper central nervous system depression.
Their effects are dose dependent, progressing from relaxation and sleep toward profound anesthesia, respiratory depression, and coma. This broad range reflects increasingly strong suppression of neuronal activity as exposure rises. The steep clinical progression makes dose selection and therapeutic monitoring important, because the difference between a desired sedative effect and dangerous depression can be consequential.
Hyperpolarization reduces neuronal excitability after chloride channels open for longer periods under barbiturate influence. This cellular effect links receptor activity with the observed suppression of central nervous system function. It provides a pharmacological basis for studying how these drugs produce sedation, anesthesia, and anticonvulsant effects while also contributing to the risk of excessive depression.
Many barbiturate applications have shifted toward safer alternatives, but the drug class remains valuable for understanding central nervous system depression and anticonvulsant therapy. It also provides a framework for studying pharmacokinetics, tolerance, and dependence. These principles help place sedative and seizure-control treatments in a broader pharmacological context, even when barbiturates are not the preferred option.
Monitoring must account for the dose-dependent movement from intended sedation or seizure control toward profound anesthesia, respiratory depression, and coma. Because the same class can produce markedly different levels of central nervous system suppression, observation is essential for judging whether the pharmacological effect remains therapeutic. This risk profile explains why careful clinical oversight accompanies their use.
Barbiturates remain relevant to overdose management because excessive central nervous system depression can progress to respiratory depression and coma. In pharmacology, they serve as a model for examining how receptor-level enhancement produces systemic toxicity. Their study also connects acute overdose concerns with longer-term issues such as tolerance, dependence, pharmacokinetics, and changing therapeutic practice.