Advanced Polymeric Platforms for Oromucosal Drug Delivery: Innovations, Design and Future Directions

Oromucosal drug delivery is swiftly revolutionising the face of patient-centric therapies, giving a rapid, sophisticated, and scientifically robust alternative to conventional oral approaches. Among these improvements, oral thin films (OTFs) have progressed from simple breath-freshening strips into polymeric platforms capable of precise dose and superior transmucosal absorption. Contemporary OTFs are driven by a wide range of polymers from natural to highly engineered synthetic varieties like chitosan, pullulan, HPMC, Eudragits, nanocellulose, thiolated polymers, and enhanced gellan derivatives designed to promote fast disintegration, faster permeation, and strong structural performance. Emerging excipient families such as cyclodextrin-based systems further unlock solubility and stability for challenging molecules. Parallel innovations in manufacturing techniques, including electrospinning, hot-melt extrusion, and 3D printing, have turned OTFs into customizable, scalable, and high-precision dosage forms. Commercial solutions like Soluleaves™, Foamburst™, and Xgel™ continue growing in creative flexibility and industrial practicality. Rigorous evaluation—spanning mechanical testing, mucoadhesion, spectroscopic profiling, and stability studies ensures global regulatory compliance. Looking to the future, OTFs are expected to exceed traditional constraints, enabling the delivery of biologics, vaccines, nanocarriers, and even CRISPR-based therapeutics powered by AI-guided development and advanced manufacturing technologies. With industry forecasts reaching USD 5 billion by 2030, oromucosal films stand at the forefront of next-generation pharmaceutical delivery.