Treatment of psoriatic arthritis with oral 1,25‐dihydroxyvitamin D3: a pilot study

Abstract
We conducted a 6‐month open‐label trial in which 10 patients with active psoriatic arthritis received 2 m̈g of oral 1,25‐dihydroxyvitamin D3 daily. Statistically significant improvement was noted in the tender joint count and physician global impression. Of these 10 patients, 4 had substantial (≥50%) improvement, and 3 had moderate (≥25%) improvement in the tender joint count. Two patients were unable to receive therapeutic doses because of hypercalciuria. High‐dose vitamin D may be a useful therapeutic agent for psoriatic arthritis.