Once you create a procedure, it remains in the database until someone explicitly removes it. Only the owner of the procedure or a user with DBA authority can drop the procedure from the database.
Deleting a procedure (Sybase Central)
Connect to a database with DBA authority or as the owner of the procedure.
Open the Procedures & Functions folder.
Right-click the desired procedure and choose Delete from the popup menu.
Connect to a database with DBA authority or as the owner of the procedure.
Execute a DROP PROCEDURE statement.
The following statement removes the procedure new_dept from the database:
DROP PROCEDURE new_dept