Refining stability and dissolution rate of amorphous drug formulations

Area of Science:

• Pharmaceutical Science
• Drug Delivery
• Materials Science

Background:

• Poor aqueous solubility of active pharmaceutical ingredients (APIs) presents a significant hurdle in developing new small molecular drugs.
• The increasing prevalence of poorly soluble new chemical entities necessitates advanced formulation strategies.
• Amorphous forms offer enhanced solubility but suffer from physical instability, requiring effective stabilization methods.

Purpose of the Study:

• To review established and emerging techniques for stabilizing amorphous forms of poorly soluble drugs.
• To explore novel formulation approaches beyond traditional polymer-based solid dispersions.
• To guide the selection of appropriate stabilization strategies for diverse APIs.

Main Methods:

• Focus on advancements in polymer-based solid dispersions for amorphous stabilization.
• Investigation of physical methods to inhibit crystallization and crystal growth.
• Exploration of interactions between APIs and small molecules for stabilization.
• Consideration of in situ amorphous form generation to circumvent storage issues.

Main Results:

• Polymer-based solid dispersions remain a primary technique for amorphous stabilization.
• Emerging methods include physical confinement and interactions with small molecules.
• In situ formation offers a potential solution to storage-related instability.
• Diverse APIs necessitate tailored stabilization approaches.

Conclusions:

• Stabilizing amorphous drug delivery systems requires diverse strategies due to API variability.
• Increased attention to novel and emerging stabilization techniques is anticipated.
• A rational, evidence-based approach is crucial for selecting optimal formulations.