Calcipotriol. A new topical antipsoriatic.

Calcipotriol is a synthetic vitamin D analogue. In vitro it can regulate cell differentiation and proliferation and suppress lymphocyte activities. These actions of calcipotriol at the cellular level are very similar to those of the natural hormone 1,25-(OH)2-D3. In contrast, the systemic effects on calcium and bone metabolism are at least 100 to 200 times less than those of 1,25-(OH)2-D3. Because of this unique pharmacologic profile, calcipotriol has been evaluated for the topical treatment of psoriasis. In well-designed and properly conducted studies involving more than 3000 patients, calcipotriol ointment, 50 micrograms/g, has been shown to be effective and safe for the short- and long-term treatment of psoriasis vulgaris. Calcipotriol ointment should be applied twice daily in amounts up to 100 g/week (Table 1). Used according to these guidelines, calcipotriol treatment does not affect calcium or bone metabolism. Calcipotriol is indicated for the treatment of plaque-type psoriasis vulgaris and has already been approved in several countries. It should be considered a first-line drug for the topical treatment of psoriasis.