Problem: An elderly female patient wants to start drinking cranberry juice to help prevent her recurrent urinary tract infections, she is also on the blood thinner, Warfarin, what advice would you give her (choose two)? Group of answer choices Cranberry juice hasn't been shown to be effective as a treatment for an existing UTI. Cranberry is an effective treatment for an UTI. Cranberries must be consumed whole, not in juice or supplement form, to receive any health benefits. There is conflicting evidence about whether cranberry interacts with the anticoagulant (blood thinner).