Plasticizers in film coatings primarily serve what purpose?

Plasticizers in film coatings play a crucial role in enhancing the flexibility and workability of the coating material. Their primary purpose is to reduce the intermolecular forces between polymer chains, which results in a softer and more pliable film. This flexibility is essential for maintaining the integrity of the coating during processes such as tableting and during the storage and transportation of pharmaceutical products. A flexible film can better withstand physical stress without cracking or breaking, ensuring that the coating remains intact and functional.

While improving drug solubility, adding color, and acting as a binder are all important aspects in pharmaceutical formulations, they do not pertain to the specific function of plasticizers in film coatings. The distinct role of plasticizers in providing flexibility is what sets them apart and highlights their importance in creating effective and reliable film coatings for drug delivery systems.