Thank you all for your input on this one.

For the record, the particular diuretic we were looking at is called Aldactone, and I have the following from its U.S. (FDA approved) prescribing information sheet:

Drug interactions:
* * *
Alcohol, barbiturates, or narcotics: Potentiation of orthostatic hypotension may occur.

http://www.pfizer.com/pfizer/downloa..._aldactone.pdf

And Jose, to the extent that you could get more information of any kind from your doctor - including citations in the literature - to "fighting water with water," it would be greatly appreciated.

Thanks again.

Mike