The invention relates to an oral pharmaceutical form containing microgranules for the sustained release of at least one active principle, including a neutral carrier that is insoluble in water or in an alcoholic solution, or a neutral carrier rendered insoluble in water or an alcoholic solution, comprising at least one first mounting layer containing at least one active principle and optionally a pharmaceutically acceptable binding agent, wherein the assembly comprises at least one coating containing at least one hydrophobic polymer.
