This invention, (a) rebochirokishinnatoriumu of the effective quantity, (b) has the average grain size under 125 millimicrons, includes the gelatinized starch which exists at the quantity 5 - 30%w/w the crystallite cellulose which exists at the quantity 60 - 85%w/w on the basis of the gross weight of prescription and (on the basis of the gross weight of c) prescription, stability it regards medicine prescription. In addition, it regards the production method of this prescription.本発明は、(a)有効量のレボチロキシンナトリウム、(b)125μm未満の平均粒度を有し、処方の総重量に基づいて60~85%w/wの量で存在する微結晶セルロースおよび(c)処方の総重量に基づいて5~30%w/wの量で存在する糊化でんぷんを含む、安定な医薬処方に関する。また、かかる処方の製造方法に関する。