What does Cranberry Juice do Sexually can vary depending on the specific health benefit you're looking for. Cranberry juice may help prevent UTIs, but it's not an immediate treatment. For prevention, regular consumption can be beneficial over time. If a UTI is already present, cranberry juice may not alleviate symptoms quickly and should not replace medical treatment. Drinking cranberry juice contributes to hydration and may support overall health relatively quickly. You might feel more energized and see improvements in urinary health shortly after regular consumption.