I have found that once you get PI it takes time to go away unless you have a super bad case and then the Dr is the best bet. They give prednisone for it. Before DH retired from the railroad they gave out something called TENU - a wash and a liquid. Worked wonderfully but I have never found it at the store. When I work outside, I always come in wash my clothes and take a bath with lye soap right away because it washes away the oils of Poison Ivy. My son is allergic to it gets it where it spreads all over his body and swells. He has to get shots.