I've had Poison Ivy, Poison Oak and Poison Sumac so many times I end up going to the Doctor's office for steroid shots and tablets as well as special cream. Last time I got it it was down my entire left side at its peak. Not fun and the OTC stuff doesn't work anymore. Granted, I had never seen Tecnu before so it might work, but I'd rather not find out. When we go hiking next time, I'm going to try the IvyX bsmith suggested.
-Jason