The present invention relates to a liquid polymeric composition capable of forming
a physiologically active substance-containing implant when it is injected into
a living body and a method of preparation thereof. The composition comprises a
water-soluble biocompatible liquid polyethylene glycol derivative, a biodegradable
block copolymer which is insoluble in water but soluble in the water-soluble biocompatible
liquid polyethylene glycol derivative and a physiologically active substance.
