The present invention provides a pharmaceutical composition stably maintaining and containing compound and/or salt thereof represented by the following formula (I), and provides means in the market (in the formula (I), R<1> and R<2> respectively and independently represent hydrogen atom or halogen atom). The pharmaceutical composition containing the compound and/or salt thereof represented by the formula (I) is filled in a resin container which is colored by the color with hue (H) from 7.0Y to 9.99Y or from 7.0YR to 9.99 YR and value (V) from 1.0 to 6.0 and chroma (C) from 0.5 to 7.5 in a Munsell color coordinate and is stored.
