no, no, no ... calcium can react to cranberry juice and make the kidney stone problem worse. drinking cranberry snapple iced tea nearly killed me one summer before I found that out. it's important to have the stones analyzed before taking anything in massive amounts. coffee, tea, colas, dark sodas and cranberry juice must be consumed in minimal portions by many kidney stone patients. I learned the hard way.
Of course, it WAS years ago (dad had his kidney attack back some time in the 70s . . . ) but he was (still is) a darned good urologist. Saved my dad's life (even though he lost one kidney). He's 80 years old now & has been running on one kidney for about 30 years.