Excipients

Excipients designate pharmacologically inactive substances formulated with active pharmaceutical ingredients to facilitate manufacturing, ensure stability, enable proper administration, and enhance drug delivery or patient acceptability. These essential components encompass diverse materials including fillers, binders, lubricants, disintegrants, coatings, preservatives, buffers, surfactants, and stabilisers.

The pharmaceutical industry maintains an extensive pharmacopeia of approved excipients with established safety profiles. Formulation scientists select excipients based on compatibility with active ingredients, stability under storage and processing conditions, manufacturing suitability, regulatory acceptance, cost, and supply reliability. Regulatory submissions include detailed excipient descriptions, justification for selections, safety assessments particularly for novel excipients, and data demonstrating functionality and compatibility. Paediatric formulations face particular challenges selecting appropriate excipients. Sustainability considerations increasingly influence excipient selection with preference for renewable sources. As therapeutic modalities diversify, excipient science continues evolving through novel materials, improved characterisation, and innovative applications.