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Updated: May 13, 2026
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Models and Methods to Evaluate Transport of Drug Delivery Systems Across Cellular Barriers
Published on: October 18, 2013
Transit of pharmaceutical dosage forms through the small intestine
Gut
|August 1, 1986
Summary
Gastric emptying of pharmaceutical dosage forms depends on food intake and dosage type. Small intestinal transit time, however, remains consistent, impacting drug delivery system design.
Area of Science:
- Pharmacokinetics and Drug Delivery
- Gastrointestinal Physiology
Background:
- Understanding gastrointestinal (GI) transit is crucial for designing effective oral drug delivery systems.
- Factors like food intake and dosage form characteristics can significantly influence drug absorption and release profiles.
Purpose of the Study:
- To investigate the impact of dosage form type and fed state on gastrointestinal transit times.
- To determine the implications of GI transit variability for the design of sustained-release drug formulations.
Main Methods:
- Analysis of 201 studies involving gamma scintigraphy in normal subjects.
- Evaluation of transit times for solutions, pellets, and single units (matrix tablets, osmotic pumps).
- Assessment across a range of feeding conditions, from fasted to a heavy breakfast.
Main Results:
- Gastric emptying varied significantly based on dosage form (solutions/pellets vs. single units) and meal size.
- Single-unit dosage forms showed prolonged gastric retention, especially after larger meals.
- Intestinal transit time was consistently around three hours, irrespective of dosage form or fed state.
Conclusions:
- Dosage form design and meal content are critical determinants of gastric emptying.
- The consistent small intestinal transit time offers a predictable window for targeted drug release.
- These findings are vital for optimizing the design of oral sustained-release drug delivery systems.
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