Potassium sparing means it spares the loss of potassium,
it controls blood pressure by diminishing the blood volume
through fluid loss (less water, less blood in the body,
lower blood pressure), it eliminates sodium
also. So, with fluid loss and lower sodium level, the electrolite balance
can get out of wack if you don't drink enough water or take in
sodium you can severe cramping of all muscles, including the heart (which
where lies the danger).
There is two choice here to restore electrolite balance Sodium - Potassium
cutting or taking more water and sodium. In most diet,
there's way enough sodium, so there should be no problem. So, drinking
water or taking less potassium would be solutions. But, most diets
don't have excess potassimum (there is potassium in almost everything,
so cutting it is pointless, just checking that your not eating tons of the
top potassium food like bananas is enough). But, even if you eat
an excess of potassium, drinking a lot of water solves the problem.