The solvent casting method is the preferred method for formulating fast-dissolving oral thin films. In this method, the drug and other excipients are dissolved in a suitable solvent after the water-soluble ingredients have been dissolved to form a clear viscous solution. The two solutions are then combined swirled and dried in a Petri dish. This method is mostly used in pharmaceutical industries. The solid casting method A newly formulated water-soluble polymer is capable of producing films when combined with an acid-insoluble polymer solution, like cellulose acetate butyrate or phthalate, to create a gel mass. An ideal gel mass can be achieved by adding the right amount of plasticizer. With specialized heat-controlled drums, the gel mass can be shaped into ribbons or films, ranging from 0.015 to 0.05 inches in thickness. For the best outcome, it is recommended to maintain a 1:4 ratio between the acidinsoluble polymer and the film-forming polymer. 16