The present invention relates to a solid pharmaceutical composition for oral administration, containing the following components (A) and (B): (A)2-[4-[2-(benzimidazol-2-ylthio)ethyl]piperazin-1-yl]-N-[2,4 -bis(methylthio)-6-methyl-3-pyridyl]acetamide (compound a) or an acid addition salt thereof, and (B) organic acid selected from the group consisting of tartaric acid, malic acid, ascorbic acid and benzoic acid. An improvement is achieved in the dissolubility of the compound a, which is useful as a therapeutic agent for hypercholesterolemia, arteriosclerosis, and the like.
