Dealing with opiate constipation?

[keats]

So SWIM finds this a bit of an embarassing subject, one which he has never discussed with his opiate using friends, but this site seems like a good place to talk about it. SWIM loves opiates and used to do them a lot, but now does them pretty moderately, once every week or two. After a short period of snorting heroin (which seemed to cause less constipation) SWIM found it too addictive and since then has stuck with hydrocodone, hydromorphone, and most of all oxycodone. When he used to use opiates to a much greater degree he was basically chronically constipated. But during that period he was also using large amounts of stimulants, so it evened out, and beyond that he was too fucked up all the time to care.

Now though, SWIM lives a pretty normal life and is much more bothered by "little" things like being constipated. SWIM finds when he uses ~20mgs of oxycodone with low tolerance he can't shit for a day or two, and when he uses 40+ it takes several days and causes significant discomfort. SWIM is aware of the typical constipation cures: fiber, laxatives (though he has little experience with these) and so on. But he is curious to here how SWIY personally deals with this issue, which I'm sure many here have experienced. Any thoughts on minimizing discomfort from opiate constipation?