How long does it take for prune juice to work?!

Best Answer - Chosen by Voters

a very small amount like a quarter to a half cup and it works pretty soon.

Prune Juice has never worked for me, but I think you can/should drink as much as you want. Just drink a cup or two and wait for an hour and see how you feel. Maybe you should also try mixing a spoonful of Benefiber in with it. :) It's a natural, tasteless fiber supplement and a long term laxative. I drink a cup of it nightly and haven't experienced constipation in quite a while.

If all else fails, drink a big cup of black coffee, smoke a cigarette, and go for a jog. That'll get the pipes working.

Much luck! :)