Multiparticulate Drug Delivery Systems: Advantages and Applications
Multiparticulate drug delivery systems offer clear advantages for controlled drug release. Manufacturers can place mini-tablets in hard capsules or administer them using special dosing units. Similarly, they can give pellets in hard capsules or compress them into tablets. Together, these forms provide flexible and precise drug delivery with polymer coatings.
In this study [1], researchers prepared four solid drug formulations and analyzed their drug release. First, they coated inert pellets with the model drug sodium benzoate. Next, they added a layer of insoluble ethyl cellulose. Afterward, they compressed the coated pellets into mini-tablets and normal tablets. Meanwhile, they directly compressed another type of mini-tablet from a sodium benzoate mixture and coated it with ethyl cellulose. They applied the coating using fluidized bed technology.
The coated pellets showed a lag time and retarded release. Afterward, the release followed first-order kinetics. In contrast, mini-tablets and normal tablets made from coated pellets released sodium benzoate without a lag time. This occurred because tableting partially disrupted the ethyl cellulose layer. Moreover, directly compressed mini-tablets released sodium benzoate more slowly as the coating thickness increased.
Therefore, the different formulations of coated pellets, mini-tablets, and normal tablets provide a wide range of drug release profiles. Consequently, they can meet various biopharmaceutical and pharmacological requirements.
Ethyl Cellulose-coated Mini-Tablets as Multiparticulate Drug Delivery Systems
Multiparticulate drug delivery systems can be made by compressing drug- and polymer-coated pellets into mini-tablets or normal tablets. Moreover, pellets and mini-tablets compressed into tablets spread widely in the small intestine. This improves drug absorption and increases bioavailability compared to normal tablets. In both tablet types, the sodium benzoate release slows down depending on the thickness and properties of the ethylcellulose coating.
Additionally, ethylcellulose-coated mini-tablets made by directly compressing sodium benzoate with excipients provide an alternative multiparticulate drug delivery method. These mini-tablets release the drug slowly, and the rate depends on the coating thickness. Consequently, they are suitable for prolonged-release applications. Furthermore, their release variation is higher than that of pellets or normal multiple-unit tablets made from pellets.
Finally, sodium benzoate layering on pellets using a fluidized bed, followed by tableting, works for both mini-tablets and normal tablets. Therefore, manufacturers can adjust the final pharmaceutical form to create diverse release profiles, which can support marketing or patenting strategies.
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