Yes, it contains sorbitol, a type of sugar not usually absorbed but which does promote gut activity. It has some small amount of fiber of the water soluable type, the whole prune has much more of this and might be a better choice. Seeking the cause of the problem would seem the long term goal to pursue.
Quoted message said:
Is prune juice really good for constipation. Because if it is, it just isn't working on me or I'm not drinking enough of it. About 3 cups per day, but it don't do much for my bowls. Anyone know anything about this?