PROBLEM TO BE SOLVED: To provide a novel drug for the treatment and/or prevention of facial paralysis.;SOLUTION: The drug for the treatment and/or prevention of facial paralysis comprises as an active ingredient a specified pyrazolone derivative (e.g., 3-methyl-1-phenyl-2-pyrazoline-5-one), a physiologically acceptable salt thereof, or a hydrate or solvate of one of the former two.;COPYRIGHT: (C)2006,JPO&NCIPI
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