Film coating technology is now a days very important in the field of pharmacy particularly in formulation development. In the last 25 years tablet coating has undergone several fundamental changes. Many modifications were advocated to improve the basic process and film coating chosen in place of sugar coating. Film coating is the process whereby a tablet, capsule, or pellet is surrounded by a thin layer of polymeric material. Tablet film coating is performed by two types, one is aqueous film coating (generally water is used as a solvent) and non aqueous film coating (generally organic solvent are used). Film coating formulations usually contain Polymer, Plasticizer, Colourants / Opacifiers, Solvent / Vehicle. Many film coating materials have functional properties which enable the creation of sustained or delayed (enteric) release dosage forms. Coating solution composition may affect the quality of final coated tablets. Optimization of composition of film coating solution is also required. This article discusses tablet coating process, film coating, process parameters, film coating advantages and applications, components of film coating, evaluation of film coated tablets, film defects etc.
SOURCE: PHARMATUTOR.ORG
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