Single High-dose Vitamin D3 Supplementation in Pediatric Patients With Inflammatory Bowel Disease and Hypovitaminosis D.

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The primary aim was to determine the effectiveness of a single high-dose of oral vitamin D3 (stoss therapy) in children with inflammatory bowel disease (IBD) and hypovitaminosis D. Our secondary aim was to examine the safety of stoss therapy. We conducted a randomized, prospective study of 44 patients, ages 6 to 21 years, with IBD and 25-hydroxyvitamin D (25-OHD) concentrations <30 ng/mL. Patients were randomized to receive 50,000 IU of vitamin D3 once weekly for 6 weeks (standard of care, SOC group) or 300,000 IU once (stoss group). Serum 25-OHD levels were obtained at baseline, 4 and 12 weeks. Safety monitoring labs were performed at week 4. Thirty-nine of 44 enrolled patients (19 stoss, 20 SOC) completed the study. Baseline vitamin D levels were not significantly different between the groups. Stoss therapy resulted in a substantial rise in 25-OHD levels at week 4, equivalent to the weekly regimen (53.6 ± 17.3 vs 54.6 ± 17.5 ng/mL). At week 12, serum 25-OHD levels decreased in both groups, significantly lower in the stoss group, but remained close to 30 ng/mL (29.8 ± 7.1 vs 40.4 ± 11.9 ng/mL, P = 0.04). A significant interaction with treatment group over time was observed (P = 0.0003). At the week-4 time point, all patients who received stoss therapy had normal serum calcium and PTH levels. Eighty percentage of patients preferred stoss therapy to the weekly regimen. Stoss therapy was safe and effective in raising 25-OHD in children with IBD commensurate to that of the weekly regimen.