most citrus fruits help to reduce kidney stones, but not grapefruit. grapefruit has different weird interaction with medication and does increase risk of kidney stones, contrary to other citrus fruits.
As far as I understand it, the interaction of Grapefruits with for example statins is because it has Furocumarine, but that isn't unique to it. Other citrus fruits have it as well. It's just that Grapefruit isn't as sour and it's consumed in much higher doses compared to say lemon juice.