the examples given fig1 2 3 and 4 the terms coating coating layer or layer have been used these terms are exchangeable and also identical to the term membrane irrespective of the nomenclature they have in common that they correspond to more or less continuous phases of excipient materials applied by e g spraying onto a core material due to the nature of the processing these membranes are relatively thin with regard to thickness suitable excipient materials for forming coatings layers or membranes for delayed and or extended release are non polymeric or polymeric materials such as calcium phosphate ethyl cellulose methacrylate copolymer polyamide polyethylene polyvinyl alcohol or polyvinyl acetate further the proton pump containing part of the formulations 2 in fig1 4 in fig2 8 in fig3 and 15 in fig4 have above been described to exert their delayed and or extended release effect by applying coatings to a core material of the proton pump inhibitor however another approach is instead to exchange the coating layer s i e the membrane system to a matrix system the excipients are then chosen to form a lipid or water insoluble matrix the function of the matrix is then to exert an extended release of the proton pump inhibitor suitable matrix forming excipients are non polymeric or polymeric materials such as calcium phosphate ethyl cellulose methacrylate copolymer polyamide polyethylene or polyvinyl acetate carnauba wax cetyl alcohol hydrogenated vegetable oils microcrystalline waxes mono and triglycerides polyethylene glycol or polyethylene glycol monostearate and most preferably carnauba wax cetyl alcohol hydrogenated vegetable oils microcrystalline waxes.