The present invention is directed to a pharmaceutical composition containing an initial dosage of psychostimulant and a second dosage of said psychostimulant, wherein the release of said second dosage is modified, characterized in that the release of said second dosage is modified by an enteric coating comprising (co-)polymers of (meth)acrylic acid and/or (meth)acrylate containing carboxyl groups, thereby causing a sustained release of said second dosage of the psychostimulant in vivo.
