Yes, not all but many seem to do this spiro first. I was a little dizzy and light headed the first few days on spiro but that didn't last long. Also it seems my body has adjusted to this med over time and I don't pee as much as I did at first, but I still drink plenty of water. You do need to be careful and not over do the water drinking too, you can drink so much you pee like crazy and flush good things from your body..
Also watch your potassium intake. Stay away from like bananas, vitamins with a loads of potassium, eating a bunch of potato chips or fries etc. Looking at the package info will show if something is loaded with potassium. As long as you just don't over do any of those you shouldn't have any issues. I'm not obsessive about no potato products, I don't eat bananas though and my blood work has always come back fine.