Symptoms subside in 2-3 weeks. Prevention Poison ivy can produce an allergic reaction in more than 70 percent of the population. Avoidance of contact or wearing protective clothing are the only effective preventive measures. Measures useful in modifying or limiting the contamination include washing the entire body thoroughly especially under fingernails, as soon as possible after exposure to the poison ivy plant. In addition, wash shoes, shoelaces, and glasses, belts, jewelry, sports equipment, garden tools, and any other items of clothing or apparel that may have been in contact with the plant.
Animals can transmit poison ivy if they have resin on their fur.
Also, do not burn the poison ivy plant as the allergen can be transmitted through the smoke. Antihistamine such as Benadryl - take as directed on package. Treatment for moderate to severe cases will be determined by your practitioner. The rash or blisters seem to become infected. The prescribed program and medication do not bring relief within 48-72 hours.