A main object of the present invention is to provide a novel coated tablet which contains a drug having a guanidino group and does not suffer an obvious color change even when packed in a one-dose pack together with a drug having a (5-methyl-2-oxo-1,3-dioxol-4-yl)methyl (DMDO) group. The present invention provides a coated tablet characterized in that an uncoated tablet containing a drug having a guanidino group has been coated with a polyvinyl alcohol for film coating which comprises polyvinyl alcohol, acrylic acid, and methyl methacrylate.
