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Quick Answer. Prune juice takes different amounts of time to relieve constipation depending on the severity of the problem. Prune juice starts working within an hour and can take an hour, six hours, a week or several weeks for a lazy bowel, according to Total Health. Continue Reading.
6 Serious Side Effects Of Prunes March 20, 2015. Think of prunes and the first thing that comes to mind is constipation! Prune juice is often used to treat constipation in infants and young children, but it can be used by adults as well. Prunes belong to the plum family and are sold mostly as dried fruits.