Is cranberry juice and grapefruit juice under the same category? if not, then what is the difference?

Notes on juices: Cranberry juice helps stop urinary infections by blocking bacterial adhesion to the bladder wall. It also helps yeast in the mouth: http://synapse.koreamed.org/DOIx.php?id=10.3349/ymj.2016.57.1.138 Grapefruit juice is most known for interfering with some drugs. Here is what the FDA says: http://www.fda.gov/downloads/ForConsumers/ConsumerUpdates/UCM292839.pdf You pharmacist should help.