group consisting of polyvinyl alcohol polyvinylpyrrolidone methylcellulose hydroxypropyl cellulose hydroxymethyl cellulose and the like a water soluble binder is preferred which is applied from an aqueous medium such as water at a level of from 0 1 to 5 wt and preferably from 0 25 to 3 wt of binder based on the total weight of the drug layer composition a filler is added to the drug layer sugars such as lactose dextrose sucrose maltose microcrystalline cellulose and the like may be used as fillers in the pellet coating composition the filler may comprise from 20 to 70 wt and preferably 40 to 50 wt based on the total weight of the drug layer composition the enteric coating agent may comprise a acid resisting material which resists acid up to a ph of above about 5 0 or higher which is selected from the group consisting of cellulose acetate phthalate hydroxypropylmethyl cellulose phthalate polyvinyl acetate phthalate carboxymethylethylcellulose eudragit l poly methacrylic acid methylmethacrylate 1 1 ratio mw no av 135 000 usp type a or eudragit s poly methacrylic acid methylmethacrylate 1 2 ratio mw no av 135 000 usp type b and mixtures thereof the enteric coating agent may also include an inert processing aid in an amount from 10 to 80 wt and preferably 30 to 50 wt based on the total weight of the acid resisting component and the inert processing aid the inert processing aids include finely divided forms of talc silicon dioxide magnesium stearate etc typical solvents which may be used to apply the acid resisting component inert processing aid mixture include isopropyl alcohol acetone methylene chloride and the like generally the acid resistant component inert processing aid mixture will be applied from a 5.