Prescription drug question

I apologize in advance if I come off as insensitive or offensive, but I am not trying to be an ass and am genuinely curious.

How do people get past the awful constipation to use prescription drugs recreationally? In my experience with Percocet (oxycodone and acetaminophen) and Valium (diazepam), I can't get off of the pills fast enough because not pooping makes me miserable.

Yes, the loopy pain-free feeling is nice, but I would much rather deal with some pain if it gets rid of the constipation. Which means I always end up with tons of extra pills laying around (too bad it's illegal to sell them, otherwise I'd be making some money). When I ask my fellow sheltered/privileged friends, they've had the same miserable constipated experience.

So how do people use prescription narcotics for fun? Do they just have better digestive systems? Do they have access to some super laxative that I wasn't given? Colace and Epsom salts did jack shit for me (pun intended).

Thoughts?