This invention becomes, including the plasticizer of 2 types at least, including the production method, and the said protective layer of mechanical protective layer and the said protective layer for the pellet, it regards the solid medication form which becomes.本発明は、少なくとも2種類の可塑剤を含んでなる、ペレットのための機械的保護層、該保護層の製造方法、および該保護層を含んでなる固形投薬形態に関する。