Poison ivy and poison oak produce identical symptoms. Both plants contain the same noxious irritant--urushiol. Urushiol causes contact dermatitis, which is another name for the intense itching and rash that makes sufferers feel like they are going out of their skins. Don't hesitate to call your doctor if you suspect you were exposed to either plant, especially if a large area of your body was exposed. Severe cases of contact dermatitis might not go away by themselves, so professional help might be necessary.
Over-the-counter potions
Several over-the-counter potions are available to treat poison ivy and poison oak: 1 percent cortisone cream, dyphenhydramine cream and calamine lotion. These remedies can provide relief from the itching that accompanies contact dermatitis. As an added benefit, calamine lotion dries up the blisters. Cortisone helps heal the skin.
Prednisone
Oral corticosteroids such as prednisone usually provide relief within 24 hours from the first dose. These drugs require a prescription. Follow the directions exactly because oral corticosteroids prevent the body from making its own corticosteroids. Prescriptions usually include a schedule for tapering the dose over a period of days or weeks. Side effects of prednisone include weight gain, fat redistribution, moon face and increased blood pressure.
Cold or Heat
Patients with minor cases of poison oak or poison ivy can numb the area with cold. Spray-on potions deliver a chilling blast that calms the itching. Patient reports on The Poison Ivy, Oak and Sumac Information Center indicate that heat from blow dryers and hot water is helpful.
High-strength Cortisone Cream
Patients who find over-the-counter preparation unhelpful might benefit from higher-strength prescription creams. Regular application provides relief from itching and helps heal the rash.
Antihistamines
Antihistamines help with the itching, which minimizes the chance of infection. Drowsiness can occur with some preparations. Talk to your doctor about which antihistamine is most effective in your situation.
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