An oral dosage form (also called "pharmaceutical form", "presentation form" or "administration medium") of sustained release, comprising: a matrix, so that the matrix comprises a first viscosity modifier in an amount of between 1% and 10% by weight of the dosage form； and coated granules (or 'coated granules'), comprising: a granule, containing hydrocodone or a salt form thereof in an amount of between 0.1% and 90% by weight of the granule, a first former powerful films in an amount of between 1% and 90% by weight of the granule, and a second viscosity modifier in an amount of between 1% and 90% by weight of the granule, so that the granule does not contain any grease / wax, a coating on the granule, so that the coating is present in an amount of between 20% and 80% by weight of the coated granule, so that the coating comprises a second powerful film former in an amount between 10% and 50% by weight of the coated granule, and a grease / wax in an amount of between 10% and 25% by weight of the coated granule, so that the first and second powerful film former are independently selected from a group that is composed ne of: ethyl cellulose； ammonium methacrylate copolymer, type B； ammonium methacrylate copolymer, type A； aminomethacrylate copolymer； a dispersion of copolymers of ethyl acrylate and methyl methacrylate； copolymer of methacrylic acid, type A； copolymer of methacrylic acid, type B； and shellac, and so that the first and second viscosity modifiers are independently selected from a group consisting of: sodium alginate, hydroxypropylmethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, methylcellulose, carboxymethylcellulose, sodium carboxymethylcellulose, polyvinylpyrrolidone , crosslinked polyacrylic acid, gelatin, pectins, gums, polyethylene oxides, Konjac flour, carrageenan, xanthan gum or mixtures of these compounds.Una forma de dosificación oral (también llamada 'forma farmacéutica', 'forma de presentación' o 'medio de administración') de liber
