The present invention is directed to a physical and chemical stable pharmaceutical formulation in form of aqueous suspension comprising a reconstituted pulmonary surfactant.Said formulation is suitable for the prophylaxis and/or treatment of respiratory distress syndrome (RDS) and other respiratory disorders.本發明係有關於呈水性懸浮液形式之物理上及化學上穩定的包含重組肺表面活性劑之醫藥配方。該配方係適合用於呼吸窘迫症候群(RDS)及其它呼吸病症的預防及/或治療。