Apricots work really affectively. I have dried ones, but be careful not to have too many. Try say 3-4 a day as a snack and see if it works, then have a couple more if that doesn't work. I had like 10 and I really regretted it once! Prunes are often used as week like some others said, but I personally don't like them.

I take quite a bit of codeine for pain which is constipating and also have IBS, so I sometimes have bowel issues too, I take fibre supplement because of my limited diet and then use the apricots if I need something on top of that.