Liposome compositions in which a drug is retained in stable condition are prepared by dispersing liposomes obtained by removal of a solvent from a drug-containing w/o emulsion in an aqueous solution having an osmotic pressure higher by at least 20 percent than the osmotic pressure of a solution used for entrapping the drug in said liposomes. This composition is conducive to a sustained therapeutic efficacy or a better delivery of the drug to a target organ.
