I can't comment on just the prunes, but I used to drink the juice to clear myself out. I would feel unusually empty the next day. Like someone on a spaceship opened the hatch and depressurized the chamber. I think there was some bloating the next day, but that was a long time ago, and I was almost always bloated back then.
The effect would take place out of nowhere about 45 mins after drinking the juice. (A rumble deep in the stomach -- as though your gut needed an exorcism. "Demons out!!") My advice is if you try the juice, make darn sure that there is a bathroom nearby! Probably best to try this at the beginning of a weekend just in case it has long lasting effects.
I only drank the juice a handful of times as I was always worried about my stomach becoming dependent on it (whether or not this is possible, I'm not sure).
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I've tried prune juice before...
I think there was some bloating the next day, but that was a long time ago, and I was almost always bloated back then.
