Exorex for Psoriasis: The Importance of Randomized Controlled Trials in Testing "New" Products.

Comments on the research 'A Double-blind, Randomized, Controlled Clinical Trial to Assess the Efficacy of a New Coal Tar Preparation (Exorex) in the Treatment of Chronic, Plaque-type Psoriasis.' Topical formulation for the treatment of psoriasis; Failure of the study to show a clinically important difference in efficacy between the Exorex and coal tar-control treated sides at the end of the evaluation period.