Stored Procedure - Ntext Error

I have the stored procedure snipet below that will work for returning a dataset that I need.

But, if I change NVARCHAR to NTEXT as the field response is, I get the error:

The text, ntext, and image data types are invalid for local variables.

CREATE PROCEDURE dbo.mySP
@errCode         INT               OUTPUT

AS
BEGIN

DECLARE @guid    uniqueidentifier
DECLARE @response      NVARCHAR

SELECT  @guid = guid, @response = response FROM myTable

SELECT guid, response
FROM myTable


Like is said, seems to work ok for now, but what if the info in the field is bigger than 4000 length as the max nvarchar can handle?

Thanks,

Zath