Potassium Supplement Question (cross post from DS board)

I was prescribed KCL, and foolishly was taking the extended release pills for two months, while my levels kept dropping.  (low levels are related to diuretic use)...  We've cut the diuretic, and started on liquid KCL, NOT extended release pills     I'm an old timer, and I don't know why that slipped on by me...usually I'm so careful with supplements.   Anyway, does anyone know if Potassium needs to be taken away from anything else?  I've read a lot about it, but didn't find anything about other vitamins/minerals.    We'll redraw the levels in 2 more weeks, but once it's stable, I'd like to get back on to a dry form of Potassium.  the liquid is a pain in the neck!   Thanks for any info,  Mary