REMEDIES FOR SPINAL CANAL STENOSIS

摘要

A therapeutic agent for spinal canal stenosis is provided, which contains a pyridazinone compound of the formula (I) wherein R<1>, R<2> and R<3> are each independently a hydrogen atom or a lower alkyl, X is a halogen atom, a cyano or a hydrogen atom, Y is a halogen atom, a trifluoromethyl or a hydrogen atom, and A is a C1 - C8 alkylene optionally substituted with a hydroxyl, or its pharmacologically acceptable salt.