PURPOSE: To obtain a stable and clear aqueous solution useful as a drug composition by blending clemastine fumarate with a phosphoric acid buffer solution containing a water-soluble polymer compound such as polyvinyl pyrrolidone and a surfactant such as Tween 20 and adjusting to a specific pH.CONSTITUTION: A phosphoric acid buffer solution containing 3-6% water-soluble polymer compound selected from polyvinyl pyrrolidone polyethylene glycol and polyvinyl alcohol and 0.01-0.5% surfactant such as ...