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Related Concept Videos

Antidotes01:17

Antidotes

976
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,...
976
Enhanced Elimination of Poison01:26

Enhanced Elimination of Poison

797
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...
797
Prevention of Further Absorption of Poison01:14

Prevention of Further Absorption of Poison

1.2K
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...
1.2K
Anticholinesterase Agents: Poisoning and Treatment01:26

Anticholinesterase Agents: Poisoning and Treatment

1.4K
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...
1.4K
Toxic Reactions: Overview01:26

Toxic Reactions: Overview

1.7K
When toxic substances penetrate the human body, they disseminate to various tissues, undergoing metabolic changes. This process yields reactive metabolites that may covalently bind with specific target molecules, resulting in toxicity.
Toxicity falls into two primary categories: local and systemic.
Local toxicity appears at the exposure site, such as protein denaturation caused by caustic substances.
In contrast, systemic toxicity requires the toxic agent's absorption and distribution,...
1.7K
Physical Properties of Amines01:26

Physical Properties of Amines

4.0K
Amines with low molecular weight are usually gaseous at room temperature, while those with high molecular weight are liquid or solids in nature. Usually, low molecular weight amines have a rotten fish-like smell. Diamines typically have a pungent smell. For instance, cadaverine and putrescine, depicted in Figure 1, are two molecules responsible for decaying tissue.
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Antidotes in Poisoning.

Binila Chacko1, John V Peter1

  • 1Medical Intensive Care Unit, Division of Critical Care, Christian Medical College, Vellore, Tamil Nadu, India.

Indian Journal of Critical Care Medicine : Peer-Reviewed, Official Publication of Indian Society of Critical Care Medicine
|February 6, 2020
PubMed
Summary
This summary is machine-generated.

Antidotes counteract poison effects by preventing absorption, neutralizing toxins, or blocking end-organ effects. This review explores various antidote mechanisms and their crucial role in managing poisoning cases.

Keywords:
AntidoteBindingPoisonToxin

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Area of Science:

  • Toxicology
  • Pharmacology
  • Emergency Medicine

Background:

  • Antidotes are critical agents that negate the effects of poisons and toxins.
  • They function by preventing toxin absorption, neutralizing poisons, antagonizing end-organ effects, or inhibiting toxic metabolite formation.
  • Antidote administration reduces active toxin levels and mitigates end-organ damage through mechanisms like competitive inhibition and receptor blockade.

Purpose of the Study:

  • To provide a comprehensive overview of antidotes used in poisoning management.
  • To elucidate the diverse mechanisms by which antidotes exert their effects.
  • To highlight the clinical significance of antidotes in toxicology.

Main Methods:

  • Review of existing literature on antidotes and their mechanisms of action.
  • Categorization of antidotes based on their functional roles (e.g., binding, antagonism, metabolite inhibition).
  • Discussion of specific examples of antidotes and their applications in various poisoning scenarios.

Main Results:

  • Antidotes employ multiple strategies including specific and non-specific binding (e.g., activated charcoal, chelating agents, immunotherapy).
  • Enhanced elimination methods like urinary alkalization and hemadsorption are discussed.
  • Mechanisms include enzyme inhibition (ethanol for methanol), enzyme function enhancement (oximes for organophosphorus), receptor blockade (naloxone), and reduction of toxic metabolites (N-acetyl cysteine for paracetamol).

Conclusions:

  • Antidotes are essential for managing poisoning, acting through diverse pharmacological mechanisms.
  • Understanding these mechanisms is crucial for effective clinical application.
  • This review underscores the broad utility of antidotes in counteracting toxin-induced harm.