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Related Concept Videos

Drug Absorption: Factors Affecting GI Absorption01:19

Drug Absorption: Factors Affecting GI Absorption

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The process of oral drug absorption can be influenced by several factors. Weakly acidic drugs tend to be absorbed more readily from the stomach due to their nonionized state. However, absorption may be less efficient in the upper intestine, where drugs are often ionized. Interestingly, despite the stomach's apparent advantage for drug absorption, its mucous layer can hinder diffusion. Its surface area is also smaller than the intestine's, which can further slow down the absorption rate.
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Factors Influencing Drug Absorption: Disease States and Pharmacology01:25

Factors Influencing Drug Absorption: Disease States and Pharmacology

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Multiple disease states can significantly influence the oral drug absorption process by affecting blood flow and the functionality of the gastrointestinal (GI) system. Various GI diseases, including conditions that alter GI motility, such as diarrhea, decreased acid secretions (achlorhydria), and infections, have been associated with reduced drug absorption.
Substances such as alcohol and specific drugs, including antineoplastics, can also negatively impact drug absorption. For instance,...
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Drugs Affecting GI Tract Motility: Antimicrobials as Antidiarrheal Agents01:18

Drugs Affecting GI Tract Motility: Antimicrobials as Antidiarrheal Agents

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Acute diarrhea, a common gastrointestinal disturbance, is characterized by the rapid evacuation of fluid stools, leading to an excessive weight in fluid. This condition typically arises from disorders affecting intestinal water and electrolyte transport. It can be triggered by an increased osmotic load within the intestine, excessive secretion of electrolytes and water, mucosal exudation of protein and fluid, or altered intestinal motility. The primary risks of acute diarrhea are dehydration...
215
Factors Affecting Dissolution: Drug Permeability, Stability and Stereochemistry01:20

Factors Affecting Dissolution: Drug Permeability, Stability and Stereochemistry

276
Orally administered drugs primarily enter the systemic circulation via passive diffusion through the intestinal membranes. The drug's absorption is influenced by drug stability in the gastrointestinal GI tract, membrane permeability, the surface area available for absorption, luminal drug concentration, and residence time in the lumen. Drug permeability can be enhanced by adjusting the lipophilicity, polarity, or molecular size of the drug, promoting its passive transport across intestinal...
276
Combined Effects of Drugs: Synergism01:27

Combined Effects of Drugs: Synergism

5.0K
Synergism is a useful mechanism where combining two or more drugs is more effective than each constituent used alone. Such combinations are also called supra-additive interactions. The drugs collectively enhance the final therapeutic effect by acting on different targets. Another advantage is that the low dose of each constituent drug is sufficient to achieve the desired effect. This helps reduce the duration of therapy and lower the adverse effects of these drugs.
Such synergistic combinations...
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Drugs Affecting GI Tract Motility: Serotonin Receptor Agonists01:23

Drugs Affecting GI Tract Motility: Serotonin Receptor Agonists

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Serotonin, a crucial neurotransmitter synthesized by enterochromaffin cells, plays a cardinal role in regulating gastrointestinal (GI) motility. With over 90% of the body's total serotonin in the GI tract, its influence on digestive processes is profound. Serotonin is swiftly released upon various stimuli, such as food boluses or certain drugs, triggering intrinsic sensory neurons in the myenteric plexus and extrinsic vagal and spinal sensory neurons. This leads to the activation of the...
443

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Updated: Sep 27, 2025

Analysis of Interactions between Endobiotics and Human Gut Microbiota Using In Vitro Bath Fermentation Systems
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Interplays between drugs and the gut microbiome.

Yating Wan1, Tao Zuo2,3

  • 1Department of Medicine and Therapeutics, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong, P. R. China.

Gastroenterology Report
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Summary

The gut microbiota significantly impacts drug efficacy and side effects. Understanding these interactions is key to developing personalized medicine and improving therapeutic outcomes.

Keywords:
drugefficacygut microbiotametabolismmicrobiome

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Area of Science:

  • Microbiology
  • Pharmacology
  • Metabolomics

Background:

  • The gut microbiota functions as a metabolic organ, influencing host metabolic processes.
  • Interactions between gut microbes and non-antibiotic drugs are complex and bidirectional.
  • Gut microbes can alter drug bioavailability, bioactivity, and metabolism, affecting therapeutic outcomes.

Purpose of the Study:

  • To review and summarize the bidirectional interactions between gut microbes and drugs.
  • To illustrate how non-antibiotic drugs alter gut microbiota composition.
  • To explore the consequences of microbial alterations and their biochemical mechanisms on drug effectiveness.

Main Methods:

  • Literature review of studies on gut microbiota and drug interactions.
  • Analysis of microbial metabolism of drugs and its impact on drug efficacy.
  • Examination of how drug-induced changes in microbiota affect host physiology.

Main Results:

  • Gut microbiota significantly influences drug efficacy, metabolism, and toxicity.
  • Non-antibiotic drugs can reshape gut microbial communities.
  • Microbial metabolites contribute to both beneficial and adverse drug effects.

Conclusions:

  • Understanding gut microbiota-drug interactions is crucial for optimizing drug therapy.
  • Targeting the gut microbiota offers novel strategies for improving therapeutic efficacy and clinical outcomes.
  • This knowledge facilitates the development of precision medicine approaches.