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Well, the average time poison ivy takes to go away is from 5-12 days. But, it is basically defined by the severity of the problem. The rash may also take 30 days or longer to last completely. Here are few important preventive measures that you may take to prevent allergic reaction due to poison ivy.
By Mayo Clinic Staff. Poison ivy treatments are usually limited to self-care methods. And the rash typically goes away on its own in two to three weeks. If the rash is widespread or results in a large number of blisters, your doctor may prescribe an oral corticosteroid, such as prednisone.