If you read any of my posts from way back when, I always reccommend prunes and prune juice. I have always been constipated.
I buy pitted prunes, not in a tin, fresh dried ones and put about 6 in a pyrex jug, cover with water and a couple of sweeteneres then blast in the microwave for say 4-5 mins. Stir for a while to let the juice and some of the fibre escape from the prunes and then leave them in the fridge overnight. I used to cooke them in the evening before I was going to eat them.
They work very well, and if you do like prunes, figs do the same job!
Anyway, I used to eat the prunes one day and then the next day I drank the juice. Its pretty potent stuff. The reason I dont use tinned prunes is because I found it a waste of money. You cant eat a full tin and the rest goes off once you have opened the tin unless you have a family that likes them.
Also, as Kevin said, drink as much water as you can it makes a massive difference.
Lynne x