then milling the mixture through the milling the triptan compound and saccharin may be obtained as a mixture in a liquid state that is an ionic liquid the milling may be performed for 10 to 100 minutes or 20 to 60 minutes in the present invention a reaction may be performed by adding 500 u03bcl or less 400 u03bcl or less or 300 u03bcl or less of water in order to shorten the time for preparing the ionic liquid in this case the reaction may be performed for 5 to 10 minutes furthermore in an exemplary embodiment an ionic liquid may be prepared by separately dissolving a triptan compound and saccharin in a solvent and then mixing the dissolved triptan compound and saccharin and performing a solvent evaporation method further the ionic liquid may be prepared by dissolving the triptan compound and saccharin together in the solvent and then performing a solvent evaporation method the solvent evaporation method may be performed in the atmospheric state but may be performed under reduced pressure and dry conditions through the solvent evaporation method an ionic liquid is precipitated in this case the solvent may be selected from the group consisting of ethanol and methanol and specifically ethanol may be.