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Preparation and Characterization of Individual and Multi-drug Loaded Physically Entrapped Polymeric Micelles
Published on: August 28, 2015
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Binary polymeric amorphous carvedilol solid dispersions: In vitro and in vivo characterization.
Marko Krstić1, Luka Manić2, Nikola Martić3
1University of Belgrade - Faculty of Pharmacy, Department of Analytical Chemistry, Vojvode Stepe 450, 11221 Belgrade, Serbia.
Summary
Formulating carvedilol solid dispersions with specific polymers and solvents significantly enhances drug dissolution and bioavailability. This novel delivery system shows promise for improved carvedilol efficacy without adverse effects on vital organs.
Area of Science:
- Pharmaceutical Sciences
- Materials Science
- Drug Delivery Systems
Background:
- Carvedilol, a beta-blocker, often faces challenges with poor solubility and dissolution rate.
- Polymeric amorphous solid dispersions offer a strategy to enhance the bioavailability of poorly soluble drugs like carvedilol.
Purpose of the Study:
- To optimize carvedilol dissolution rate by preparing binary polymeric amorphous solid dispersions.
- To investigate the influence of solvent type, polymer type, and drug-polymer ratio on carvedilol's dissolution characteristics.
- To evaluate the in vivo safety and efficacy of the developed carvedilol solid dispersion formulation.
Main Methods:
- Solvent method used for preparing solid dispersions with various polymers (polyvinylpyrrolidone, polyvinylpyrrolidone-vinyl acetate copolymer, etc.) and solvents (ethanol, acetone).
- Carvedilol-polymer ratios (1:1, 1:2, 1:4) and different diluents (lactose, mannitol, microcrystalline cellulose) were tested.
- Fourier Transform Infrared Spectroscopy (FTIR) and Powder X-ray Diffraction (PXRD) analyzed drug crystallinity and drug-polymer interactions.
- In vitro dissolution studies and in vivo animal studies assessed drug release, bioavailability, and safety.
Main Results:
- Solid dispersions confirmed the amorphous state of carvedilol, with evidence of hydrogen bonding between drug and polymer.
- Higher drug-polymer ratios and solvents promoting polymer solubility led to significantly increased carvedilol dissolution rates.
- The optimal formulation (polyvinylpyrrolidone-vinyl acetate copolymer, 1:4 ratio in ethanol) achieved 91.78% dissolution in 30 minutes.
- Capsules containing this solid dispersion and microcrystalline cellulose showed 93.43% dissolution in 30 minutes, with enhanced bioavailability and no observed toxicity.
Conclusions:
- Binary polymeric amorphous solid dispersions are effective in enhancing carvedilol dissolution and bioavailability.
- The choice of polymer, solvent, and drug-polymer ratio critically impacts the dissolution performance.
- The developed formulation is safe and effective for improving carvedilol delivery.
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