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Psoriasis is a common skin disease, affecting 1%-2% of the population
in the United Kingdom. Traditionally, topical treatments including coal
tar, dithranol, and topical corticosteroids have been the mainstay of
treatment for patients with mild to moderate disease. In recent years,
however, calcipotriol, a synthetic vitamin D3
analogue, has become one of the most widely prescribed treatments. On
p 963 Ashcroft et al report on a systematic review of randomised controlled trials of topical calcipotriol in the treatment of plaque
psoriasis. The results from short term studies showed that calcipotriol
was more effective than coal tar, short contact dithranol, and
tacalcitol. Only potent topical corticosteroids seemed to have
comparable efficacy at eight weeks, with fewer short term side effects
than calcipotriol.