The present invention relates to a method for preparing a nanosuspension comprising the step of dissolving a poorly soluble drug in a solvent, Transcutol, and a nanosuspension of a poorly soluble drug prepared therefrom, and has a low toxicity instead of a conventional organic solvent and By using the applicable Transcutol, it is possible to prepare a nano suspension without additionally removing the solvent, and the average diameter of the particle size of the nanosuspension is less than 300 nm, so long-term storage for more than 6 months is possible. It can be used usefully as a product.
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