Patent ID: 7976853

Claim:
A method of producing a coated preparation, which method comprises coating a core with an aqueous dispersion, comprising pioglitazone hydrochloride and a core-coating material selected from the group consisting of (a) hydroxypropyl cellulose, wherein (i) a 5%(w/v) aqueous solution of which cellulose has a viscosity of 24 mPa·s at 20° C. and/or (ii) a 2%(w/v) aqueous solution of which cellulose has a viscosity of 3.0-5.9 mPa·s at 20° C.; (b) hydroxypropyl cellulose, wherein (i) a 5%(w/v) aqueous solution of which cellulose has a viscosity of 8 mPa·s at 20° C. and/or (ii) a 2%(w/v) aqueous solution of which cellulose has a viscosity of 2.0-2.9 mPa·s at 20° C.; and (c) polyvinyl alcohol-polyethylene glycol graft copolymer whose 5%(w/v) aqueous solution has a viscosity of not more than 35 mPa·s at 20° C., wherein the core comprises an active ingredient.