Approaches to developing fast release pellets via wet extrusion-spheronization.

Area of Science:

• Pharmaceutical Technology
• Drug Delivery Systems
• Materials Science

Background:

• Microcrystalline cellulose (MCC) is a preferred excipient for extrusion-spheronisation (ES) pellet manufacturing due to its favorable physical properties.
• However, MCC-based pellets often exhibit prolonged or incomplete drug release, particularly with poorly soluble drugs, due to significant pellet contraction during drying.
• This limitation restricts their use in immediate-release formulations.

Purpose of the Study:

• To review and discuss current strategies for developing fast-release pellets using the wet extrusion-spheronisation (ES) process.
• To address the challenges associated with drug release from MCC-based pellets.
• To provide an integrated overview of techniques for overcoming MCC limitations in immediate-release pellet formulations.

Main Methods:

• Review of literature on modifications to MCC, incorporation of superdisintegrants, and porosity enhancement.
• Exploration of strategies involving partial or complete MCC substitution.
• Investigation of methods to improve the solubility of poorly soluble drugs, such as solid dispersions and self-emulsifying drug-delivery systems.

Main Results:

• Various approaches have been investigated to mitigate the slow drug release from MCC pellets.
• Modifications to MCC, addition of disintegrants, and porosity control can improve pellet disintegration.
• Enhancing drug solubility is a key strategy when dealing with poorly soluble compounds.

Conclusions:

• Achieving fast drug release from pellets manufactured via wet ES requires overcoming the inherent limitations of MCC.
• A combination of formulation strategies, including excipient modification and drug solubility enhancement, is often necessary.
• This review consolidates current knowledge on preparing effective fast-release pellets for immediate drug delivery.