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Theophylline controlled-release formulations: in vivo-in vitro correlations
Z Yu1, J B Schwartz, E T Sugita
1Department of Clinical Pharmacology and Statistics, ALZA Corporation, Palo Alto, CA 94304, USA.
Biopharmaceutics & Drug Disposition
|April 1, 1996
Summary
This study evaluated four controlled-release theophylline formulations. In vitro and in vivo dissolution data showed a strong correlation, suggesting in vitro tests can guide future oral drug delivery system design.
Area of Science:
- Pharmacology
- Pharmaceutics
- Drug Delivery Systems
Background:
- Controlled-release oral solid dosage formulations are crucial for maintaining therapeutic drug levels.
- Theophylline is a widely used bronchodilator requiring precise dosage control.
- Optimizing in vitro dissolution testing is key to predicting in vivo performance.
Purpose of the Study:
- To develop and characterize four novel controlled-release oral solid dosage formulations of theophylline.
- To evaluate the in vitro dissolution profiles of these theophylline formulations.
- To assess the in vivo pharmacokinetic performance and correlate it with in vitro data.
Main Methods:
- Development of four experimental controlled-release oral solid dosage formulations.
- In vitro dissolution studies using USP apparatus I.
- In vivo pharmacokinetic evaluation in beagle dogs under fasting conditions.
- Numerical deconvolution methods to determine in vivo drug absorption and release.
Main Results:
- Theophylline dissolution characteristics were successfully studied in vitro.
- Pharmacokinetic evaluation in beagle dogs provided in vivo data.
- A good correlation was observed between in vivo and in vitro dissolution data.
- Numerical deconvolution effectively estimated drug absorption and GI tract release.
Conclusions:
- In vitro dissolution testing demonstrates significant potential for optimizing the design of controlled-release theophylline oral solid dosage formulations.
- The developed formulations showed predictable performance based on in vitro data.
- This study validates the use of in vitro dissolution as a predictive tool for in vivo drug release.