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What Are the Treatments?

First, if you think you have been exposed to poison ivy, oak, or sumac, wash all exposed areas thoroughly. If you can do this within five minutes of contact, many times you may avoid the allergic reaction.

You can treat most cases of the rash yourself with the application of calamine lotion, Burrow's Solution, or over-the-counter topical remedies containing antihistamines or hydrocortisone. Cold compresses — 15 to 30 minutes several times a day — are useful for itching and blistering; cool showers are also effective. A cortisone shot may relieve the itching, particularly within 24 hours of exposure.

Oral corticosteroids or antihistamines may also relieve the symptoms, but both drugs can have unwanted side effects. If you have complications from a severe case, you may need to see a doctor. If your case is so severe that general illness (fever, nausea, dehydration) develops, your doctor may recommend injections of prednisone or another steroid.

If you do contact any of these poisonous plants, be sure to clean your clothing, tools, or any gear that you may have had with you. Since urushiol can remain on clothing and other items for extended periods of time, you don't want to be reinfected at a later date by touching a contaminated item.