Abstract: Water is used to control particle size in a process comprising mixing water with a composition comprising a rheology modifying agent and possibly sugar and cellulose to produce a paste. The paste is extruded to form particles which are then spheronised and dried. One advantage of using water to control particle size is that the number of particles having a diameter within a required range, e.g. between from about 800 to about 1500 ?m, may be increased.

Abstract: An improved composition for controlling the release profile of an active compound through the intestinal tract comprises particles, especially pellets, containing the active compound, which are coated with a pH dissolution dependent coating material or a polymethacrylate material, which is preferably pH dissolution dependent, to a certain thickness depending upon the location and rate of release of the active compound that is desired. In preferred compositions, two or more pluralities of particles, in which particles of each plurality are coated with pH dissolution dependent coating material or polymethacrylate material to a different thickness to those of each other plurality, are contained within an enterically coated capsule and provide release of the active compound at various desired locations in the intestinal tract.