This invention provides a combination-drug composition and a combination use of pharmaceuticals for preventing and/or treating dyslipidemic conditions such as hyper-LDL cholesterolemia in mammals, including humans. This invention pertains to a drug composition for preventing and or treating dyslipidemia and the like, the drug composition including the following: (R)-2-[3-[[N-(benzoxazol-2-yl)-N-3-(4-methoxyphenoxy)propyl]aminomethyl]phenoxy] butyric acid, a salt thereof, or a solvate of either； and nicotinic acid and nicotinic-acid amide, collectively referred to as niacin, an ester derivative thereof, a salt thereof, or a solvate of any of these.
