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Related Concept Videos

Antidotes01:17

Antidotes

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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,...
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Inflammatory Bowel Disease IV: Pharmacological Management01:29

Inflammatory Bowel Disease IV: Pharmacological Management

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Upon diagnosis, managing Inflammatory Bowel Disease (IBD) involves addressing several crucial aspects. The primary goals include resting the bowel, correcting malnutrition, and providing symptomatic relief. Resting the bowel may consist of medications to reduce inflammation and promote healing. Correcting malnutrition is essential, often requiring dietary adjustments and nutritional supplements. Symptomatic relief aims to ease pain, diarrhea, and other discomforts in IBD.
Pharmacologic...
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Enhanced Elimination of Poison01:26

Enhanced Elimination of Poison

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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...
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Drug Distribution: Tissue Binding01:21

Drug Distribution: Tissue Binding

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Upon entering the systemic circulation, drugs can distribute into the interstitial and intracellular fluid of various tissue cells. This distribution is facilitated by the binding of drugs to different cellular components within tissues, which may lead to drug accumulation in specific areas. Drugs bound to tissue components serve as reservoirs that release free drugs back into the system, prolonging the drug's overall action. However, this accumulation can also result in local toxicity.
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Therapeutic Index01:13

Therapeutic Index

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The therapeutic index of a drug is a key parameter in pharmacology that quantifies the relative safety of a drug by calculating the ratio between the dose that causes toxicity in half the population (50%) to the dose that proves to be effective for half the population (50%). It provides a spectrum of doses for a particular drug ranging from effective to potentially toxic. To illustrate, consider an anticoagulant agent like warfarin. It possesses a narrow window within its therapeutic index to...
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Drugs for Treatment of Constipation-Predominant IBS

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Pharmacological therapies for IBS-C are designed to alleviate abdominal discomfort and enhance bowel function. In patients with IBS-C, fiber supplements may help soften stools and decrease straining, but may also lead to increased gas production and bloating. Osmotic laxatives like milk of magnesia are frequently used to soften stools and increase stool frequency in IBS-C patients. In addition, two drugs approved for use in severe IBS-C adult cases are linaclotide (Linzess) and lubiprostone...
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Bioactive Bismuth Compounds: Is Their Toxicity a Barrier to Therapeutic Use?

Ângela Gonçalves1, Mariana Matias1, Jorge A R Salvador2,3

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Bismuth compounds, used for ulcers and infections, are generally safe but can cause toxicity with overuse. Discontinuing use typically reverses these effects, but ongoing research is vital due to widespread exposure.

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Area of Science:

  • Pharmacology and Toxicology
  • Environmental Health

Background:

  • Bismuth compounds exhibit low aqueous solubility, contributing to their perceived non-toxicity.
  • Widely utilized in treating peptic ulcers, functional dyspepsia, and chronic gastritis.
  • Bismuth derivatives are also investigated for antimicrobial and anticancer applications.

Purpose of the Study:

  • To provide an updated review of the pharmaco-toxicological profile of bismuth compounds.
  • To investigate the toxicity of bismuth compounds, focusing on in vitro, in vivo, and clinical evidence.
  • To address the growing environmental presence and daily use of bismuth products.

Main Methods:

  • Comprehensive literature review of in vitro, in vivo, and clinical studies on bismuth toxicity.
  • Analysis of pharmaco-toxicological data related to bismuth compound usage.
  • Evaluation of reported side effects and toxicity mechanisms.

Main Results:

  • Bismuth compounds are generally considered non-toxic due to low solubility, but excessive or prolonged intake can lead to toxicity.
  • Discontinuation of bismuth compounds typically results in the reversal of toxic effects.
  • Growing environmental prevalence necessitates a deeper understanding of potential adverse effects.

Conclusions:

  • While beneficial in treating various conditions, the potential for bismuth toxicity must be acknowledged.
  • Further research is crucial to fully understand and mitigate the risks associated with increasing bismuth exposure.
  • Balancing therapeutic benefits with safety is essential for responsible use of bismuth compounds.