Oral Ivy by Boericke & Tafel temporary relieves rashes and blisters caused by dermatitis from exposure to poison ivy, poison oak, and poison sumac. It is an easy-to-take liquid – just put 10 drops of the liquid in 2 ounces of water for a couple of hours. You can also use it as a dietary supplement for prevention 2 weeks before exposure by having 3 to 5 drops in 1/4 glass of water daily. Oral Ivy stimulates your body’s natural defenses against these poisonous plants.