| 摘要 |
PROBLEM TO BE SOLVED: To obtain an oral preparation hardly causing discoloring even in long-term storage and excellent in quality by formulating S-(3-hydroxypropyl)- L-cysteine useful as an expectorant with a specific vehicle. SOLUTION: This oral preparation is obtained by formulating S-(3- hydroxypropyl)-L-cysteine (hereinafter referred to as HPCY) with a vehicle consisting substantially of only starch. Corn starch, potato starch or wheat starch can be exemplified as the starch and the starch is preferably used in an amount of 0.01-8 pts.wt. based on 1 pt.wt. HPCY. Cyclodextrins may be formulated with HPCY as the vehicle.α-Cyclodextrin,β-cyclodextrin, etc., can be exemplified as the cyclodextrins and the cyclodextrins are preferably used in an amount of 0.01-8 pts.wt. based on 1 pt.wt. HPCY.
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