Crystalline API Forms for Stable Dissolution and Drug Storage

The patent applies parameter changes by transforming the physical state of the compound from amorphous to crystalline forms. Specifically, it identifies and characterizes multiple crystalline polymorphs (Form I, Form II, Form III) and co-crystal forms with different co-formers (fumaric acid, tartaric acid, citric acid, malic acid). This phase transition from amorphous to crystalline state fundamentally changes the stability parameters while maintaining manufacturability through established crystallization and co-crystallization processes.

The patent employs composite materials by creating co-crystal forms that combine the active pharmaceutical ingredient with co-formers such as fumaric acid, tartaric acid, citric acid, and malic acid. These co-crystal compositions enhance the chemical and physical stability of the compound while improving dissolution properties. The co-crystal forms represent composite solid-state structures that leverage the beneficial properties of both the API and the co-former molecules.

The patent resolves this contradiction by identifying specific crystalline forms and co-crystal forms that optimize both dissolution rate and thermodynamic stability. The co-crystal forms, in particular, are designed to have enhanced solubility and dissolution rates compared to the pure API crystalline forms, while maintaining thermodynamic stability. The selection of specific co-formers with appropriate molecular structures and properties enables tuning of dissolution characteristics without sacrificing stability.

The patent applies local quality by creating distinct crystalline and co-crystal forms with specific local molecular arrangements and interactions. Each crystalline form and co-crystal form possesses unique local structural characteristics that influence dissolution behavior. The co-crystal forms exhibit local molecular environments that facilitate faster dissolution while the overall crystalline structure maintains thermodynamic stability. This local structural optimization allows simultaneous improvement of dissolution rate and stability.