polymer preferably selected from methacrylic acid copolymers type a and b in one embodiment the second layer comprises from about 10 to about 85 wt of the enteric coating polymer and from about 15 to about 75 wt of the water insoluble polymer the core may comprise a saccharide such as saccharose starch cellulose and a cellulose derivative preferably microcrystalline cellulose an inert pellet core a first layer being an active ingredient layer comprising pramipexole or a pharmaceutically acceptable salt thereof and optionally one or more wet binders and further excipients and a second layer provided on the first layer the second layer being an extended release coating comprising a at least one water insoluble polymer and optionally a pore former the resulting pellet having a ph independent in vitro release characteristic or b a mixture of a ph dependent enteric coating polymer and a ph indenpendently water swelling polymer the resulting pellet having a close to zero order in vitro release characteristic at acidic ph values up to ph 6 8 an accelerated release above ph 6 8 and a more accelerated release above ph 7 3 the inert pellet core may comprise polysaccharides cellulose a cellulose derivative starch and or waxes the inert pellet core further may comprise saccharose and or microcrystalline cellulose preferably microcrystalline cellulose such an extended release pellet.