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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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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...
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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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Pharmacokinetics: Drug–Drug Interactions01:25

Pharmacokinetics: Drug–Drug Interactions

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Drug interactions occur when the pharmacological effect of one drug is altered by another substance, either enhancing or diminishing its activity. The drug whose activity is altered is known as the object drug, and the substance causing the alteration is called the agent drug or the precipitant. The net effects of these interactions are mostly undesirable, leading to decreased effectiveness or increased adverse effects. In rare cases, interactions can be beneficial, such as the enhanced...
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Combined Effects of Drugs: Synergism01:27

Combined Effects of Drugs: Synergism

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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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Factors Affecting Dissolution: Drug Permeability, Stability and Stereochemistry01:20

Factors Affecting Dissolution: Drug Permeability, Stability and Stereochemistry

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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...
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Related Experiment Video

Updated: Dec 21, 2025

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

Rinse K Weersma1, Alexandra Zhernakova2, Jingyuan Fu2,3

  • 1Department of Gastroenterology and Hepatology, University of Groningen, University Medical Centre Groningen, Groningen, The Netherlands r.k.weersma@umcg.nl.

Gut
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The gut microbiome influences how the body responds to medications and immunotherapy. Understanding these pharmacomicrobiomics interactions can lead to improved cancer treatments and drug efficacy.

Keywords:
drug metabolismimmunotherapyintestinal microbiologyproton pump inhibition

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Area of Science:

  • Microbiology
  • Pharmacology
  • Immunology

Background:

  • The human gut microbiome is a complex ecosystem interacting with the host and environment.
  • Gut microbes and non-antibiotic drugs engage in bidirectional interactions.
  • The gut microbiome influences drug response by altering drug structure, bioavailability, bioactivity, and toxicity (pharmacomicrobiomics).

Purpose of the Study:

  • To review bidirectional interactions between microbes and drugs.
  • To describe drug-induced changes in gut microbiota and their clinical consequences.
  • To summarize the microbiome's impact on drug effectiveness and immunotherapy.

Main Methods:

  • Literature review of existing research on pharmacomicrobiomics.
  • Analysis of how non-antibiotic drugs affect gut microbiota composition.
  • Examination of the microbiome's role in modulating drug metabolism and immunotherapy response.

Main Results:

  • Common non-antibiotic drugs can significantly alter gut microbiota composition.
  • Gut microbes enzymatically transform drugs, affecting their efficacy and toxicity.
  • The microbiome plays an indirect but crucial role in cancer immunotherapy outcomes.

Conclusions:

  • Understanding drug-microbiome interactions is key to personalized medicine.
  • Modulating the gut microbiome holds potential for enhancing drug effectiveness.
  • Targeting the microbiome could improve patient response to cancer immunotherapy.