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Related Concept Videos

Pharmacokinetics in Pediatric Patients: Drug Distribution01:17

Pharmacokinetics in Pediatric Patients: Drug Distribution

554
Drug distribution in the pediatric population exhibits unique challenges and considerations due to the physiological differences between children, particularly neonates and infants, and adults. A crucial aspect of pediatric pharmacology is understanding how these differences impact the pharmacokinetics of various drugs, necessitating age-specific dosing strategies to ensure efficacy and safety.Neonates and infants have a higher total body water content, ~75%–90% of their body weight,...
554
Pharmacokinetics in Pediatric Patients: Overview and Drug Absorption01:23

Pharmacokinetics in Pediatric Patients: Overview and Drug Absorption

967
Understanding the physiological differences in the pediatric population is crucial for effective pharmacotherapy. Neonates, infants, and children exhibit significant variations in gastric pH, gastric emptying time, intestinal transit time, and biliary function. These variations profoundly affect oral drug absorption, necessitating a nuanced approach to pediatric dosing.Neonates present with a unique physiological profile, having a gastric pH greater than 4 and faster and more irregular gastric...
967
Pharmacokinetics in Pediatric Patients: Drug Metabolism01:24

Pharmacokinetics in Pediatric Patients: Drug Metabolism

410
In pediatric care, understanding the nuances of hepatic drug metabolism is crucial, as it significantly differs from that of adults. This divergence is primarily due to the developmental stage of drug-metabolizing enzymes, which affects how medications are processed in the body. In neonates, for instance, the activity of Phase I enzymes—critical for the initial breakdown of drugs—is markedly reduced, functioning at just 20–40% of the levels seen in adults. This reduction poses...
410
Pharmacokinetics in Obese Patients: Drug Metabolism and Excretion01:20

Pharmacokinetics in Obese Patients: Drug Metabolism and Excretion

324
Drug metabolism, a critical process in the liver, involves two primary phases: Phase I reactions and Phase II conjugation. Obesity introduces significant alterations in this metabolic process, primarily due to fatty infiltration of the liver, leading to conditions such as nonalcoholic fatty liver disease (NAFLD). This condition can modify the activities of both Phase I and II enzymes, impacting how drugs are metabolized in obese patients.Phase I metabolism sees variable effects across...
324
Pharmacodynamics in Geriatric Patients: Effects of Age01:27

Pharmacodynamics in Geriatric Patients: Effects of Age

367
Age-related pharmacokinetic changes are extensively documented, but understanding age-related pharmacodynamic alterations is relatively limited. This knowledge gap can be partly attributed to the complexity of developing appropriate measures of drug responses compared to bioanalytical methods for determining drug concentrations.Most information regarding age-related differences in human pharmacodynamics originates from cross-sectional studies. However, these studies assume that observed mean...
367
Pharmacokinetics in Obese Patients: Drug Absorption and Distribution01:25

Pharmacokinetics in Obese Patients: Drug Absorption and Distribution

440
Obesity significantly alters the pharmacokinetic processes of drug absorption and distribution, presenting unique challenges in medical treatment. The increased fat tissue and decreased lean muscle in obese individuals can significantly affect how drugs are absorbed into the body and distributed across different tissues. This alteration can lead to variances in the effectiveness and safety of medications, necessitating adjustments in dosing or drug selection for obese patients.One notable...
440

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Related Experiment Video

Updated: Apr 30, 2026

Determination of the Transport Rate of Xenobiotics and Nanomaterials Across the Placenta using the ex vivo Human Placental Perfusion Model
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Physiologic and pharmacokinetic changes in pregnancy.

Maged M Costantine1

  • 1Division of Maternal Fetal Medicine, Department of Obstetrics and Gynecology, University of Texas Medical Branch Galveston, TX, USA.

Frontiers in Pharmacology
|April 29, 2014
PubMed
Summary

Pregnancy significantly alters how the body processes medications, affecting drug distribution, metabolism, and excretion. Understanding these physiological changes is crucial for safe and effective drug therapy during pregnancy.

Keywords:
fetuspharmacokineticspharmacologyphysiologypregnancy

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Area of Science:

  • Pharmacology
  • Obstetrics
  • Physiology

Background:

  • Pregnancy involves significant physiological adaptations impacting maternal organ systems.
  • Hormonal shifts and the needs of the developing fetus drive these adaptations.
  • Maternal physiological changes include altered body composition, hemodynamics, and organ function.

Purpose of the Study:

  • To elucidate the profound impact of pregnancy-induced physiological changes on drug pharmacokinetics.
  • To highlight the importance of understanding these alterations for optimizing medication efficacy and safety.
  • To emphasize the need for informed therapeutic strategies in pregnant individuals.

Main Methods:

  • Review of physiological adaptations during pregnancy.
  • Analysis of how these changes affect drug absorption, distribution, metabolism, and excretion (ADME).
  • Examination of the consequences for drug pharmacodynamics.

Main Results:

  • Increased maternal blood volume, body water, and fat influence drug distribution.
  • Decreased plasma protein concentrations affect drug binding.
  • Altered renal blood flow and hepatic enzyme activity modify drug excretion and metabolism.
  • Delayed gastrointestinal motility impacts drug absorption.

Conclusions:

  • Physiological changes during pregnancy significantly alter drug pharmacokinetics.
  • A thorough understanding of these pharmacokinetic shifts is essential for safe and effective medication management.
  • Optimizing maternal and fetal health requires careful consideration of drug therapy in pregnant women.