When I was a kid in Boy Scouts, I'd get it every camp out. It would be all over my body, probably from the smoke of the campfires with vines left on them.
Got into my eyes, and EVERYWHERE. Required going to the hospital. Couldn't sleep in clothes.
Sometime in my teens they said an injection of hemoglobin would stop the allergy.
Very thick stuff that had to be injected into the hip and was very painful for a couple of days at that spot.
After a series of 4, if I get it now, there is just a small strip of it on the arm or leg and it goes away on it's own after a few days.
I get it really bad too, never heard of hemoglobin for the ivy rash. My doc always gives me the shot, ointment, and viagra to keep the sheets off me at night.