I'm guessing it's probably misoprostol. It's frequently prescribed for helping soften the cervix to assist with various procedures. I had to take it the night before getting my IUD. Yes it caused cramps and bleeding but I've had labor pain level cramps before so it wasn't a big deal for me. Other women who aren't as used to bad cramps might find it more painful. But it helps get the cervix ready to be opened easier.
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