We have investigated the clinical response of 12 patients with erythrodermic psoriasis to therapy with etretinate. Initial dosage of etretinate was 20-60mg/day. The time for complete disappearance of scales averaged 19.9 days. In 10 of 12 patients(83.3%) satisfactory results were obtained after 2 to 11 months of treatment. Cheilitis was the most common side effect. Three patients had mild elevation of blood lipids, which was corrected by dose reduction. Remission period, of ten patients who showed good result, averaged 4.2 months.