I know this has been written about before, but which is best for Ibs c? I was put off lactulose before so have never tried it, as it apparently causes bad gas and pain (not sure if it contains lactose too), but now another doctor has suggested trying it. I use laxido (movicol), but not constantly. Still having problems. Has anyone tried lactulose successfully. It is apparently in little sachets now so can have as little as poss.