tecnu rash relief medicated anti-itch spray 6 oz (pack of 3) tecnu if you've had poison ivy rash, you know the itching and discomfort can drive you crazy! tecnu rash relief anti-itch spray immediately relieves the painful itching of poison ivy, oak, and sumac rash. the spray will also help dry the oozing commonly caused by poison ivy rash and promotes healing to help prevent scars.