What is Cranberry Juice Good for Sexually to have an effect can vary based on the individual and the reason for consumption. If you're drinking cranberry juice to help prevent or manage urinary tract infections (UTIs), it may take a few days of regular consumption to notice benefits. However, it's not a substitute for medical treatment if an infection is present. Drinking cranberry juice can help with hydration, which can be beneficial for overall health and may help flush out bacteria from the urinary tract. The amount of cranberry juice you consume can also influence how quickly you might notice benefits.