The present provides a condensed pyridine compound (I) represented by the following formula:
1
ring A represents benzene ring, pyridine ring, thiophene ring or furan ring; and
B represents
2
its pharmaceutically acceptable salt or hydrates thereof, which isa clinically useful medicament having a serotonin antagonism, in particular, that for treating, ameliorating or preventing spastic paralysis or central muscle relaxants for ameliorating myotonia.
Clinically highly useful drugs having an antagonism to serotonin, in particular, central muscle relaxing drugs for treating, ameliorating or preventing spastic paralysis or ameliorating myotonia and comprising fused pyridine derivatives represented by general formula (I), pharmacologically acceptable salts thereof or hydrates of either (I) or (1), wherein the ring A represents a benzene, pyridine, thiophene or furan ring; and B represents (2).