SUSTAINED-RELEASE PREPARATION

摘要

It is intended to provide a sustained-release pharmaceutical preparation with a pH-independent absorbability. The sustained-release preparation is characterized by containing 4-bromo-6-[3-(4-chlorophenyl)propoxy]-5-(3-pyridylmethylamino)-3(2H)-pyridazinone or a salt thereof as an pharmaceutically active ingredient and containing a hydrogel base and an organic acid.