Hey Jane,
If he is talking about misoprostal, thats what I had to take just before my D&C. Its apparently part of the abortion pill medication. They wanted me to "loosen" everything up for them, it improved the odds of them cleaning me out properly.
I had to put them in at 5am, and report at the hospital by 8am. Until then my bleeding was very minimal, actually just brown mucus when I wiped. And I was 3w missed, so things were going very, very slowly for me.
About 2hrs after I inserted them, I got really bad cramping and the bleeding got really, really heavy. So I probably starting to pass everything before theatre, but thats OK I guess.
Its probably not a bad thing for him to suggest, you can do the pills yourself though I would think, and you might find things re a bit more gentle for you since you have already passed quite alot.
Big hugs again.