Forward -- Excipient Applications in Formulation Design and Drug Delivery: An Introduction -- Drug Excipient Interactions -- Reactive Impurities in Excipients -- Reactive Impurities in PEG: A Case Study -- Impact of Excipient Interactions on Solid Dosage Form Stability -- Protein - Surfactant Interactions at the Air-Water Interface -- Smart Polymers in Drug Delivery -- Tailoring the Oral Release of Drugs Using Polymeric Excipients -- Solid lipid excipients as matrix agents for sustained drug delivery -- Impact of Excipient Interactions on Drug Bioavailability from Solid Dosage Forms -- Biopolymers in Medical Implants -- Selection of Excipients Based on the Biopharmaceutics Classification System of Drugs -- Excipient Selection in Oral Solid Dosage Formulations Containing Moisture Sensitive Drugs -- Silicone excipients in pharmaceutical drug delivery applications -- Excipients that Facilitate Amorphous Drug Stabilization -- Excipients in Pediatric Formulations: Biopharmaceutical and Toxicological Considerations -- Role of Innovator Product Characterization in Generic Product Development -- Addressing Excipient Variability in Formulation Design and Drug Development -- Improved Polymer Functionality by Cross-linking with Glutaraldehyde to Achieve Controlled Drug Release -- Excipient Design by Co-processing for Direct Compression Applications -- Excipients and Non-medicinal Agents as Active Pharmaceutical Ingredients -- Drug Delivery Applications of Chitosan and its Derivatives.