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Related Concept Videos

Antidotes01:17

Antidotes

Antidotes are medicinal substances used to counteract the harmful effects of toxins or drugs in the body. They function in various ways, each uniquely designed to combat specific toxic compounds.
Specific antidotes operate by inhibiting the enzymes that control biochemical pathways, reducing the production of harmful metabolites.
An example of an antidote is atropine, which counteracts the detrimental effects of cholinesterase inhibitors. It achieves this by deactivating muscarinic receptors,...
Pharmaceutical Poisoning: Treatment Strategies01:26

Pharmaceutical Poisoning: Treatment Strategies

Treatment strategies for poisoning are a critical aspect of emergency medicine, focusing on preventing the absorption of toxins and enhancing their elimination. When a poisoning incident occurs, the first response is to halt exposure and decontaminate the patient, particularly through gastrointestinal (GI) methods if the poison was ingested.Gastrointestinal Decontamination Techniques:Activated charcoal is the cornerstone of GI decontamination. It works through adsorption, binding the toxin to...
Prevention of Further Absorption of Poison01:14

Prevention of Further Absorption of Poison

In cases of acute poisoning, the primary objective is to prevent further absorption of the toxic substance into the body. Immediate interventions using various decontamination techniques targeting the gastrointestinal (GI) tract can achieve this. Decontamination is crucial to prevent poison from entering the systemic circulation, which involves washing affected areas with water and mild soap and removing contaminated clothing. Once external decontamination is done, attention must be turned to...
Enhanced Elimination of Poison01:26

Enhanced Elimination of Poison

Poison can be effectively removed from the gastrointestinal (GI) tract through various decontamination procedures.
Antidotes serve a crucial role in counteracting the effects of poison by inhibiting enzymes responsible for producing harmful drug metabolites. In some cases, these toxic metabolites can be neutralized by endogenous cosubstrates, which are maintained at specific concentrations to prevent interaction with cellular macromolecules and subsequent cell death.
Renal excretion is the...
Aldehydes and Ketones with HCN: Cyanohydrin Formation Overview01:32

Aldehydes and Ketones with HCN: Cyanohydrin Formation Overview

Cyanohydrins are compounds that contain –CN and –OH groups on the same carbon atom. They are formed by the nucleophilic addition of the cyanide ions to the carbonyl group. Cyanide ions are highly basic and nucleophilic and can be generated from HCN under aqueous conditions. However, since HCN is a weak acid, the number of cyanide ions generated is very small. Hence, a small amount of base or KCN/NaCN is added to HCN to increase the concentration of the cyanide ions in the reaction mixture.
Anticholinesterase Agents: Poisoning and Treatment01:26

Anticholinesterase Agents: Poisoning and Treatment

Anticholinesterases, also known as cholinesterase inhibitors, work by blocking the breakdown of acetylcholine, leading to its accumulation in the synaptic cleft. This accumulation indirectly enhances both muscarinic and nicotinic actions. These agents are classified as reversible or irreversible based on their mechanism of action.     
Irreversible agents form a strong bond with the cholinesterase enzyme, making it inactive. The breakdown of the phosphorylated enzyme is slower than the...

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Related Experiment Video

Updated: Jun 21, 2026

A Direct, Early Stage Guanidinylation Protocol for the Synthesis of Complex Aminoguanidine-containing Natural Products
09:04

A Direct, Early Stage Guanidinylation Protocol for the Synthesis of Complex Aminoguanidine-containing Natural Products

Published on: September 9, 2016

Which cyanide antidote?

Alan H Hall1, Jane Saiers, Frédéric Baud

  • 1Toxicology Consulting and Medical Translating Services, Inc., Laramie, WY 82072, USA. ahalltoxic@msn.com

Critical Reviews in Toxicology
|August 5, 2009
PubMed
Summary
This summary is machine-generated.

Hydroxocobalamin emerges as a promising cyanide antidote with a favorable safety profile. It offers rapid action and is suitable for prehospital use, unlike other antidotes with significant toxicity risks.

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Area of Science:

  • Toxicology
  • Emergency Medicine
  • Pharmacology

Background:

  • Cyanide poisoning presents a significant public health challenge, particularly from fire-smoke inhalation.
  • A lack of international consensus exists regarding the optimal cyanide antidote based on risk-benefit profiles.
  • Effective cyanide antidotes are crucial for managing mass-casualty incidents and potential bioterrorism.

Purpose of the Study:

  • To critically assess available cyanide antidotes and their risk-benefit profiles.
  • To compare existing antidotes against the properties of an ideal cyanide antidote.
  • To inform therapeutic and administrative decisions for cyanide poisoning management.

Main Methods:

  • Review of preclinical and clinical data on cyanide antidotes.
  • Comparative analysis of efficacy, toxicity, and administration profiles.
  • Evaluation against criteria for an ideal cyanide antidote.

Main Results:

  • All reviewed antidotes demonstrated efficacy in animal studies and clinical experience.
  • Hydroxocobalamin exhibits a favorable safety profile, with no clinically significant toxicity in antidotal doses.
  • Other antidotes like the Cyanide Antidote Kit, dicobalt edetate, and 4-dimethylaminophenol have toxicity concerns limiting prehospital use.

Conclusions:

  • Hydroxocobalamin possesses key characteristics of an ideal cyanide antidote, including rapid action and safety.
  • Its tolerability and safety profile support prehospital administration, even in smoke-inhalation victims.
  • Hydroxocobalamin is a viable option for cyanide poisoning, offering a better risk-benefit ratio than many alternatives.