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Table 1

Vitamin D Preparations

PreparationDoseMaximal EffectSize
1,25 Dihydroxycholecalciferol (active vitamin D3, calcitriol)0.03–0.06 µg/kg/day1–4 days0.25 and 0.5 µg capsules, 1.0 µg/mL oral solution, and 1 and 2 µg/mL injectable
Dihydrotachysterol (DHT)

Maint: 0.01–0.02 mg/kg/24–48h

1–7 daysCurrently unavailable; formerly available as 0.125 mg, 0.2 mg, 0.4 mg tablets and 0.2 mg/mL syrup
Ergocalciferol (vitamin D2)

Maint: 1,000–2,000 U/kg/day-week

5–21 days25,000 and 50,000 U capsules and 8,000 U/mL syrup