The present invention provides: a therapeutic and/or preventive agent for chronic skin diseases which comprises (a) a phosphodiesterase (PDE)-IV inhibitor or a pharmaceutically acceptable salt thereof and (b) a steroid agent as active ingredients; a therapeutic and/or preventive agent for chronic skin diseases to be administered simultaneously or separately with an interval which comprises (a) a PDE-IV inhibitor or a pharmaceutically acceptable salt thereof and (b) a steroid agent, as active ingredients; a kit for treating and/or preventing chronic skin diseases characterized by comprising (a) a first component comprising a PDE-IV inhibitor or a pharmaceutically acceptable salt thereof and (b) a second component comprising a steroid agent; and the like.
The present invention relates to oxygen-containing heterocyclic compounds represented by the following formula (I):
1
wherein m represents an integer of 0 to 4; R
1
, R
2
, R
3
and R
4
independently represent a hydrogen atom, substituted or unsubstituted lower alkyl, etc.; R
5
represents substituted or unsubstituted lower alkoxy etc.; R
6
represents a hydrogen atom etc.; and Y represents the following formula (II):
2
wherein R
9
represents cyano etc., R
10
represents a hydrogen atom etc., R
1
represents carboxy etc., and R
2
represents a hydrogen atom etc.; and the like; or pharmaceutically acceptable salts thereof.