**5. Category of thin films**

Thin film is not a new preparation; it was initially launched in the late 1970 to help people take tablets and capsules that were difficult to swallow. The oral film, oral thin film, orodispersible film, oral soluble film, wafer, oral strip, buccal film, mucoadhesive film, transmucosal film, ocular film, and transdermal and topical film are some of the names given to thin films [2].
