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Related Concept Videos

Inhaled Medications01:23

Inhaled Medications

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Inhaled medications are crucial for managing chronic obstructive pulmonary disease (COPD) and asthma. They are essential for effective treatment and control, ensuring optimal respiratory health and well-being. Inhaled medication delivers drugs directly to the lungs, providing a rapid onset of action and reducing systemic side effects compared to oral or injectable medications. Three primary types of inhalation devices are used to administer these medications: nebulizers, metered-dose inhalers...
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Additional Routes of Drug Administration01:18

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Choosing the appropriate route of drug administration is significantly influenced by two key factors: the therapeutic objectives and the inherent properties of the drug being used.
Administering drugs via inhalation allows for the direct delivery of gaseous, volatile substances or droplets to different parts of the respiratory tract. One of the advantages of the inhalation route is the rapid absorption of drugs into the circulatory system, which is possible because of the large surface area of...
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Drug delivery methods like oral inhalation, nasal sprays, transdermal patches, eye drops, intravitreal injection,  and rectal administration provide localized effects with reduced toxicity.
Oral inhalation and nasal sprays swiftly transfer drugs across the respiratory epithelium's mucosal layer. Inhaled glucocorticoids and bronchodilators directly target lung conditions such as asthma, while fluticasone nasal spray mitigates allergic rhinitis.
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The one-compartment model is a pharmacokinetic tool that models the body as a single, uniform compartment, facilitating the understanding of drug distribution and elimination. This model is particularly beneficial for intravenous (IV) bolus administration, where the drug rapidly circulates throughout the body.
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The human body requires oxygen to function, and when the natural process of respiration is hindered, external devices, including the following, are needed to help deliver this vital gas.
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Related Experiment Video

Updated: Jul 29, 2025

Dry Powder and Nebulized Aerosol Inhalation of Pharmaceuticals Delivered to Mice Using a Nose-only Exposure System
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Predicting Inhaled Drug Dose Generated by Mesh Nebulizers.

Yu-Chung Hsu1, Hsin-Hsien Li2, Li-Chung Chiu3

  • 1MicroBase Technology Corp., Taoyuan, Taiwan.

Journal of Aerosol Medicine and Pulmonary Drug Delivery
|May 23, 2023
PubMed
Summary

A new formula accurately predicts inhaled nebulized drug doses by measuring breathing patterns. This system helps optimize drug delivery for spontaneous breathing patients, improving therapeutic outcomes.

Keywords:
breath patterninhale drug doselung modelsprediction formulavibrating mesh nebulizers

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Area of Science:

  • Pharmacokinetics and Drug Delivery
  • Respiratory Medicine
  • Biomedical Engineering

Background:

  • Lung dose of nebulized drugs is variable, influenced by patient breathing patterns and nebulizer performance.
  • Accurate prediction of inhaled drug doses is crucial for effective respiratory therapy.
  • Existing methods lack precision in accounting for individual breathing dynamics.

Purpose of the Study:

  • To develop and validate a system for measuring breath patterns.
  • To create and test a formula for estimating inhaled drug doses.
  • To assess the accuracy of the prediction formula in healthy individuals.

Main Methods:

  • Developed an in vitro model using a breathing simulator to test correlations between delivered dose and 12 adult breathing patterns.
  • Engineered a pressure sensor system to measure breathing parameters (e.g., inspiratory time to total respiratory cycle time ratio).
  • Validated the prediction formula ex vivo with three nebulizer brands and salbutamol in 10 healthy individuals using Bland-Altman analysis.

Main Results:

  • In vitro and ex vivo models showed inspiratory time to total respiratory cycle time (T/Ttotal) significantly correlated with delivered drug dose.
  • The prediction formula accounted for initial dose, respiratory pattern, and nebulizer accessory/reservoir dose.
  • Predicted inhaled doses showed a lower difference (3.98%-5.02%) compared to the observed inter-subject variability (12.68%-21.68%).

Conclusions:

  • The developed estimation formula accurately predicts inhaled drug doses for nebulized medications.
  • The system effectively accounts for variations in breathing patterns during spontaneous breathing.
  • This validated prediction method can improve the precision of nebulized drug delivery in clinical practice.