Organic compounds

A method of preparing a microencapsulated pharmaceutically active agent, the method comprising the steps of

• a) dispersing an aqueous solution of a pharmaceutically active agent in a solution comprising an organic polymer solvent and a polymer dissolved therein, to form a water-in-oil primary emulsion,
• b) mixing the primary emulsion with an aqueous external phase comprising water and a surfactant;
• and
• c) dispersing the primary emulsion in the aqueous external phase to produce a product comprising the microencapsulated pharmaceutically active agent in a dispersed mixture,
• wherein the dispersing step c is performed before the polymer solvent can be extracted from the primary emulsion as a result of performing step b, and
• d) passing a current of N2 or air over the dispersed mixture.