. . "In order to improve the properties and appearance of the drug delivery system of the present invention, one or more excipients, coloring agents, isotonic agents, antioxidants, and the like, may be added to the drug delivery system, for example, excipients such as starch, dextrin, mannitol, sorbitol, cyclodextrin and tragacanth, coloring agents such as beta-carotene, red color No. 2 and blue color" . . .