Abstract: The present invention relates to a pharmaceutical composition for controlled delivery of at least one active ingredient into an aqueous phase, said pharmaceutical composition comprising: a tablet, preferably obtainable by compression, said tablet comprising said at least one active ingredient and optionally excipients; and a coating, applied on said tablet, said coating covering at least part of said tablet to impede the release of said at least one active ingredient from at least part of the surface of said tablet, said coating being applied in a manner allowing the release of said at least one active ingredient from said tablet after contacting said pharmaceutical composition with said aqueous phase, establishing one or more degradation surfaces of said tablet; wherein the first derivative of the area of each degradation surface with respect to time is larger than or equal to zero.