It is a functional film coating system which is formulated to give protection from gastric fluids to tablets. It provides protection at acidic pH 1.2 for 2 hours and releases the drug at pH 6.8 buffer. Polymers used in this type of coating are Methacrylic acid co-polymer Type A, Methacrylic acid co-polymer Type B, Methacrylic acid co-polymer Type C, Cellulose acetate Phthalate, Hydroxypropyl Methyl Cellulose phthalate. It can be used in dispersion media i.e non-aqueous, aqueous. We can match any shade or even make transparent coat on the film. The recommended weight gain is 8-12 % w/w.