This invention provides a pharmaceutical aqueous composition having preservation effect and being less stimulative by containing cysteine and malic acid.The pharmaceutical aqueous composition may further contain other additives that are acceptable as a pharmaceutical aqueous composition such as a buffer agent, a tonicity agent, and a medicament as necessary.本發明係藉由含有半胱胺酸(cysteine)及蘋果酸(malic acid)以具有保存功效、而提供低刺激性之醫藥用水性組成物。本發明之醫藥用水性組成物中係可更含有可調配之添加物、或視需要之藥物作為緩衝劑或等張化劑等醫藥用水性組成物。由於本案的圖為評估結果之圖,皆無法代表本案發明之技術特徵。故本案無指定代表圖。