Ernst T M
Z Hautkr. 1981 Sep 15;56(18):1197-206.
The topical treatment of active chronic psoriasis can be achieved as effectively with 0,1% dithranol + 17% urea as with triamcinolone acetonite 0,1%. Compared with salicylic acid + dithranol preparations, the latter when combined with urea show a delayed clinical response, but less side effects. UVB in combination with the dithranol/urea preparation seems to be more efficient, without an increment of adverse effects. It would appear than an addition of urea offers an acceptable and effective alternative to salicylic acid.