The present invention is directed to a preserved liquid aqueous pharmaceutical composition comprising one or more etherified cyclodextrin derivatives； one or more water-soluble preservatives； preferably selected from the group consisting of sorbic acid or salts thereof, preferably sodium sorbate, potassium sorbate, calcium sorbate； benzoic acid or salts thereof, preferably sodium benzoate； benzalkonium chloride； benzethonium chloride； cetylpyridinium chloride； sodium metabisulfite； sodium acetate； parabenes and salts thereof, preferably methylparabene, ethylparabene, propylparabene, butylparabene, butylparabene sodium； or combinations thereof； and at least one pharmaceutically active compound which is poorly water-soluble, very poorly water-soluble or water-insoluble. The liquid aqueous pharmaceutical composition provides an acceptable solubility of the pharmaceutically active compound, such as pimobendan, in aqueous solution whereby the water- soluble preservatives retain their effectiveness in the presence of the etherified cyclodextrin derivatives allowing the use in an oral administration form.
