*Thin Films: A Promising Approach for Drug Delivery System DOI: http://dx.doi.org/10.5772/intechopen.103793*

or towards the oral cavity due to the adaptability of the production methods; in the latter instance, it can give controlled release via gastrointestinal (GI) tract administration. On the other hand, films that deliver the medicine to the buccal mucosa can be created. Using directing absorption through the venous system that drains from the cheek, films delivering medicine towards the buccal mucosa prevent the first-pass effect [53]. The majority of polymers utilised as mucoadhesives are hydrophilic polymers that expand and let for chain connections with the mucin molecules in the buccal mucosa [54]. Hydroxypropyl cellulose (HPC), hydroxypropylmethylcellulose (HPMC), hydroxyethylcellulose (HEC), sodium carboxymethyl cellulose (SCMC), poly(vinyl pyrrolidone) (PVP), and chitosan are examples of swellable polymers.
