Oral preparations comprising S-(3-hydroxypropyl)-L-cysteine

An oral preparation comprising an active ingredient, an excipient, and an additive, wherein:

• the active ingredient consists essentially of S-(3-hydroxypropyl)-L-cysteine (HPCY), the excipient is corn starch, and the additive comprises talc and magnesium stearate,
• in the amounts of 200 parts by weight of HPCY, 18 parts by weight of corn starch, 1 part by weight of talc, and 1 part by weight of magnesium stearate, whereby the oral preparation is not discolored after 12 months at room temperature, or 3 months at 40° C., or 1 month at 50° C.

An oral preparation comprising an active ingredient, an excipient, and an additive, wherein:

• the active ingredient consists essentially of S-(3-hydroxypropyl)-L-cysteine (HPCY), the excipient is α-cyclodextrin, and the additive comprises talc and magnesium stearate,
• in the amounts of 200 parts by weight of HPCY, 78 parts by weight of α-cyclodextrin, 1 part weight of talc, and 1 part by weight of magnesium stearate, whereby the oral preparation is not discolored after 12 months at room temperature, or 3 months at 40° C., or 1 month at 50° C.

An oral preparation comprising an active ingredient, an excipient, and an additive, wherein:

• the active ingredient consists essentially of S-(3-hydroxypropyl)-L-cysteine (HPCY), the excipient is α-cyclodextrin, and the additive comprises talc and magnesium stearate,
• in the amounts of 200 parts by weight of HPCY, 18 parts by weight of α-cyclodextrin, 1 part weight of talc, and 1 part by weight of magnesium stearate, whereby the oral preparation is not discolored after 12 months at room temperature, or 3 months at 40° C., or 1 month at 50° C.