Abstract: A controlled-release oral dosage form suitable for administration to a mammal. The dosage form comprises a drug and an organic acid or a salt thereof. The dosage form releases no more than 60% the total amount of the drug within about a first hour, the remaining amount of the drug being released over a period of time of about 5 to about 8 hours subsequent to the first hour. Such a dosage form can be particularly useful for delivery of various pH-dependent solubility drugs.

Abstract: The invention provides a controlled release dissolution and diffusion devices which can deliver an active ingredient at a constant or controlled-variable rate comprising an active ingredient and dissolution modifiers and/or an insoluble matrix. The compressed core is coated, except for at least one exposed face, with a coating containing an insoluble polymer or a mixture of an insoluble polymer and pore-forming elements said pore-forming elements having a dissolution rate slower that the release rate so that the pore formation is completed after release of the active ingredients and the residual inert structures disintegrate.