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Monolithic osmotic tablet system for nifedipine delivery.
1Department of Polymer Science and Technology, Chonbuk National University, 664-14 Dukjin Dong, Dukjin Ku, 561-756, Chonju, South Korea.
Summary
This study introduces a novel monolithic osmotic tablet system for controlled drug delivery. The system offers zero-order release of nifedipine for up to 24 hours, demonstrating simplicity and effectiveness for water-insoluble drugs.
Area of Science:
- Pharmaceutical Technology
- Drug Delivery Systems
- Osmotic Drug Delivery
Background:
- Controlled drug delivery aims to maintain therapeutic drug concentrations, reducing dosing frequency and improving patient compliance.
- Osmotic drug delivery systems offer precise control over drug release kinetics.
- Nifedipine, a calcium channel blocker, is often formulated for sustained release to manage cardiovascular conditions.
Purpose of the Study:
- To develop and characterize a monolithic osmotic tablet system for nifedipine.
- To investigate the influence of formulation variables on drug release.
- To evaluate the in vitro performance of the developed system compared to existing dosage forms.
Main Methods:
- Formulation of monolithic osmotic tablets using cellulose acetate (CA) membrane with two orifices.
- Systematic investigation of tablet formulation variables: polyethylene oxide (PEO) molecular weight and concentration, potassium chloride (KCl) concentration, rice starch, and nifedipine loading.
- Evaluation of orifice size and membrane plasticizer type (PEG vs. triacetin) and concentration.
- In vitro drug release studies under various media and agitation rates; comparison with commercial capsules and push-pull osmotic tablets.
Main Results:
- Polyethylene oxide (PEO) with MW 300,000 g/mol and optimized KCl and PEO amounts positively influenced drug release.
- Nifedipine loading significantly decreased drug release.
- Optimal orifice size ranged from 0.25-1.41 mm.
- Hydrophilic plasticizer polyethylene glycol (PEG) enhanced release, while hydrophobic triacetin reduced it.
- The system achieved approximate zero-order release of nifedipine for 24 hours, independent of external conditions.
Conclusions:
- The monolithic osmotic tablet system provides a simple and effective approach for controlled nifedipine delivery.
- The system exhibits robust zero-order release kinetics comparable to push-pull osmotic tablets.
- This technology is particularly suitable for formulating water-insoluble drugs requiring sustained release.