Declare @Id Int                               
Select @Id = Id From sysobjects Where Name = 'Kalaid'
IF not Exists(SELECT * FROM syscolumns WHERE id = @Id and Name = 'Org_Code')
  Alter Table dbo.Kalaid Add Org_Code VARCHAR(6) 

Select @Id = Id From sysobjects Where Name = 'TblDrugUse'
if not Exists(SELECT * FROM syscolumns WHERE id = @Id and Name = 'Gid')
  Alter Table TblDrugUse Add Gid int null