Drug-induced lupus erythematosus resembles systemic lupus erythematosus (SLE). It occurs as a result of a hypersensitivity reaction to a medication. The drug may react with cell materials, causing the body to react to itself and form antinuclear antibodies (antibodies against structures in the body's own cells). Several medications are known to cause drug-induced lupus, including: procainamide, isoniazid, chlorpromazine, penicillamine, sulfasalazine, hydralazine, methyldopa, and quinidine. Symptoms tend to occur after taking the drug for at least 3 to 6 months. In drug-induced lupus erythematosus, the features of arthritis, systemic symptoms, and cardiac and pulmonary (lung) symptoms may be present. Other symptoms associated with SLE, such as lupus nephritis and neurological disease, are rare. Drug-induced lupus erythematosus is usually not as severe as SLE. Usually, the symptoms go away within a few days to weeks after stopping the medication. Drug-induced lupus affects men and women equally. The sex distribution of drug-induced lupus erythematosus is equal, whereas in SLE, women are affected more often than men.
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