Abstract: A pharmaceutical composition for treating peripheral circulation disorders, which is an emulsion containing an isocarbacyclin having the following formula (1): ##STR1## wherein R.sup.1 is a hydrogen atom or alkyl group and R.sup.2 is a alkyl group which may be substituted with, a alkenyl group or alkynyl group which may be substituted with, or a cycloalkyl group which may be substituted with, in an amount of 0.2 to 1,000 .mu.g per ml of the composition, a vegetable oil in an amount of 0.05 to 0.5 g per ml of the composition, a phospholipid in an amount of 0.01 to 0.5 g per g of the vegetable oil, and water is provided.