the present invention relates to a novel process for preparing sustained release tablets containing medicinal compounds and the products prepared by said process . the present invention is directed to a method of preparing a sustained release pharmaceutical composition having a predetermined drug release profile , but which is deviated therefrom by adding a tableting effective amount of a water insoluble or partially insoluble cellulose , to said pharmaceutical composition comprised of a drug in a therapeutically effective amount , and sustained release carrier present in amounts effective retard the release of the drug from the pharmaceutical composition and said cellulose , the latter being present in an aqueous system , the improvement comprising adding to the composition an effective amount of maltodextrin to retard the increase on the rate of release of the drug from the addition of said cellulose thereto .