The invention relates to a stable supersaturated aqueous solution comprising a benzimidazole compound of formula (I) and an organic carboxylic acid selected from the group consisting of substituted or unsubstituted aliphatic C3-C8 α,ω-dicarboxylic acids and substituted or unsubstituted aliphatic C2-C6 monocarboxylic acids and to its use in the treatment and/or prevention of conditions mediated by H1 histamine receptor, such as allergic disorders or diseases. The invention also relates to the use of the above organic carboxylic acids to increase the aqueous solubility of benzimidazole compounds of formula (I).
