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Published on: December 17, 2021
Solubility-modulated monolithic osmotic pump tablet for atenolol delivery
1Zhejiang University, College of Pharmaceutical Sciences, Hangzhou, People's Republic of China. liulx@zju.edu.cn
This study developed an acid-modulated monolithic osmotic pump tablet for atenolol delivery. The optimized formulation achieved near zero-order drug release for 24 hours, independent of external conditions.
Area of Science:
- Pharmaceutical Technology
- Drug Delivery Systems
- Materials Science
Background:
- Developing effective drug delivery systems for poorly soluble drugs remains a challenge.
- Osmotic pump tablets offer controlled drug release but require formulation optimization for specific drugs like atenolol.
Purpose of the Study:
- To develop and optimize a monolithic osmotic pump tablet for atenolol.
- To improve atenolol solubility using an acid-alkali reaction for controlled release.
Main Methods:
- Atenolol solubility was modulated using tartaric acid.
- Formulation components included sodium chloride (osmotic agent) and polyvinyl pyrrolidone (retardant).
- Ethyl cellulose with polyethylene glycol 400 formed the semipermeable membrane; optimization used orthogonal design and f(2) evaluation.
Main Results:
- The optimized atenolol monolithic osmotic pump tablet demonstrated approximate zero-order release kinetics.
- Drug release was sustained for up to 24 hours.
- Release rate was independent of release media and agitation speed.
Conclusions:
- Acid-modulated solubility is a viable strategy for preparing osmotic pump tablets of poorly water-soluble drugs.
- This approach may be applicable to other drugs with alkaline or acid functional groups.
- The developed tablet provides a robust and effective delivery system for atenolol.
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