For me, it lasted about a week. That was after three days of IVSM. The first day of withdrawal was the worst. I was throwing up, and my blood pressure probably dropped really bad. It was pretty horrible.

I'm just coming off of a small oral taper of prednisone. (can't afford an IVSM infusion, even tho I have insurance) I started at 40mg last week, and tomorrow is the last day of the taper. I've felt like crap all day. Knowing that tomorrow is the last day, and then thursday there won't be anymore, I know I'm still going to have a crash even if it was a little taper, and not a huge infusion. I'm really not looking forward to it.