Patent ID: 7867514

Claim:
A method for suppressing discoloration and deterioration of a pharmaceutical preparation caused by sodium lauryl sulfate being contained therein, the method comprising incorporating at least one basic substance selected from the group consisting of metal silicates, metal oxides, and metal hydroxides into a preparation that contains a pharmacological substance, sodium lauryl sulfate, and at least one cellulose selected from a group consisting of low-substituted hydroxypropyl cellulose, hydroxypropylmethyl cellulose, hydroxypropyl cellulose and crystalline cellulose, wherein the incorporation of at least one basic substance selected from the group consisting of metal silicates, metal oxides, and metal hydroxides suppresses discoloration and deterioration of a pharmaceutical preparation caused by sodium lauryl sulfate, and the pharmaceutical preparation contains 3 to 9 parts by weight of the basic substance per 80 parts by weight of the pharmacological substance.