Disclosure contents of this invention regard the medicine constituent which includes the polymer nano grain which possesses the glass transition temperature of part and specification. Other feature of this invention includes the manner which produces this nano grain.本発明の開示内容は一部、特定のガラス転移温度を有するポリマーナノ粒子を含む医薬組成物に関する。本発明の他の態様は、かかるナノ粒子を製造する方法を含む。