The last time I took it, it completely shut down my gastro-intestinal tract. Completely.
It was like the day after 9/11/01. I went outside and it was weird. There were NO airplanes, no contrails in the sky. There's always a faint background noise from airliners, even though the nearest international airport is 150 miles from here. Complete silence.
After I took my last dose of codeine, I was the same way. There was NO activity from my stomach or any other part of my GI tract ... for two solid days. None. It was strange to sit quietly, or lay in bed at night, and NOTHING happening inside.
When it gradually woke up, it took a couple MORE days to get back to normal.
I'm not doing THAT again!