Vitamin D dose
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Here is a thorough breakdown of Vitamin D dosing, synthesized from Goodman & Gilman's Pharmacological Basis of Therapeutics, Goldman-Cecil Medicine, and Tietz Textbook of Laboratory Medicine, cross-referenced with current NIH guidelines:
Vitamin D Dosing Reference
Daily Reference Intakes (National Academy of Medicine / Endocrine Society)
| Population | Recommended Daily Allowance | Notes |
|---|---|---|
| Infants 0-12 months | 400 IU/day | Especially breastfed infants (unfortified milk) |
| Children & Adults 1-70 years | 600 IU/day | For bone health maintenance |
| Adults >70 years | 800 IU/day | To prevent falls and fractures |
| Pregnant/Lactating | 600 IU/day | May need up to 1,500-2,000 IU/day to sustain 25(OH)D >30 ng/mL |
| Adults with obesity | 2-3x standard dose | Adipose tissue sequesters vitamin D |
| Tolerable Upper Limit (adults) | 4,000 IU/day | Not to be exceeded for maintenance dosing |
Therapeutic Dosing for Deficiency / Disease
| Indication | Dose | Notes |
|---|---|---|
| Deficiency treatment (general) | 1,500-2,000 IU/day | To maintain 25(OH)D consistently above 30 ng/mL |
| Short-course repletion | 50,000 IU/week x 8-12 weeks | Prescription-strength ergocalciferol (D2) or high-dose D3 |
| Nutritional rickets (prophylaxis) | 400 IU/day | Breastfed infants |
| Rickets (mild treatment) | 1,000 IU/day | Normalizes serum Ca2+ and phosphate in ~10 days |
| Rickets (severe/rapid healing) | 3,000-4,000 IU/day | Used when thoracic rickets compromises respiration |
| Osteomalacia (loading dose) | Per serum 25(OH)D level | Goal: raise 25(OH)D well above 30 ng/mL; individualize based on labs |
| CKD-MBD | Calcitriol (active form) | Bypasses impaired renal 1-alpha-hydroxylation; dose per renal function |
| Hypoparathyroidism | Calcitriol 0.25-0.5 mcg/day | Active vitamin D analog required |
(Goodman & Gilman's, Ch. 52; Goldman-Cecil Medicine, Ch. 226)
Monitoring Targets
- Deficient: 25(OH)D < 20 ng/mL (50 nmol/L)
- Insufficient: 20-29 ng/mL
- Sufficient: ≥ 30 ng/mL (75 nmol/L) - calcium absorption is maximal around this level
- Toxic range concern: generally > 150 ng/mL
The serum marker to measure is 25-hydroxyvitamin D [25(OH)D], with a plasma half-life of 2-3 weeks. The active form, 1,25(OH)2D (calcitriol), has a half-life of only 4-6 hours and is not used for routine monitoring.
Special Considerations
- High-dose supplementation caution: Paradoxically, very high doses can increase production of 24,25(OH)2D, which may block the action of active 1,25(OH)2D and has been associated with increased falls and fractures in some RCTs - Tietz Textbook of Laboratory Medicine, p. 2166
- Malabsorption (celiac, IBD, biliary disease): Oral absorption is bile-dependent; these patients may need calcitriol (absorbed independently of bile) or parenteral dosing
- Vitamin D2 vs D3: D3 (cholecalciferol) is modestly more potent for raising serum levels, but the difference is not clinically significant at standard supplementation doses
- Toxicity signs: Hypercalcemia, hypercalciuria, nephrolithiasis, soft tissue calcification. Reassess if 25(OH)D exceeds 80-100 ng/mL on treatment
The NIH Vitamin D Health Professional Fact Sheet and the Endocrine Society consensus are good primary references for current clinical guidelines.
Vit D 60000 U for 1-0-1 Followed by 1-0-0 12 doses
This is a common Indian subcontinental prescribing pattern for vitamin D deficiency. Let me interpret it:
Prescription Interpretation
Phase 1 — Loading (High-Dose Repletion)
Vit D 60,000 IU — 1-0-1 (twice daily)
- 60,000 IU × 2 = 120,000 IU/day
- Typically given for a short burst (usually 7-10 days, sometimes up to 2-4 weeks depending on severity)
- Total loading: ~840,000 – 1,680,000 IU over 1-2 weeks
Phase 2 — Maintenance
Vit D 60,000 IU — 1-0-0 × 12 doses (once daily)
- 60,000 IU/day for 12 consecutive days, OR more likely:
- 12 weekly doses (once a week × 12 weeks) = 720,000 IU total over 3 months
- The weekly interpretation is most common in clinical practice in India
Most Likely Intended Regimen
The standard Indian protocol (per API/FOGSI guidelines) for severe vitamin D deficiency is:
| Phase | Dose | Frequency | Duration | Total |
|---|---|---|---|---|
| Loading | 60,000 IU | Twice daily | 10 days | ~1,200,000 IU |
| Maintenance | 60,000 IU | Once weekly | 12 weeks | 720,000 IU |
This is equivalent to roughly 1.9 million IU over ~3 months - a recognized aggressive repletion strategy for serum 25(OH)D < 10-12 ng/mL.
Clinical Notes
- 60,000 IU sachets/capsules (cholecalciferol, D3) are the standard OTC/Rx formulation in India (brands: Calshine, D-Rise, Arachitol 6L, Uprise-D)
- Target after repletion: 25(OH)D ≥ 30-40 ng/mL
- Monitor: Serum calcium, urine calcium/creatinine ratio, and repeat 25(OH)D at 3 months
- Toxicity watch: Hypercalcemia, hypercalciuria, thirst, polyuria - unlikely at this regimen but possible if patient has granulomatous disease (sarcoidosis, TB) or primary hyperparathyroidism
- After completing 12 maintenance doses, transition to a long-term maintenance dose of 1,000-2,000 IU/day or 60,000 IU/month
Note: The "1-0-1" and "1-0-0 × 12" shorthand is standard South Asian prescription notation (morning-afternoon-night). If this is a daily regimen rather than weekly for Phase 2, monitor closely - 12 days of 60,000 IU/day is on the higher end but within reported safe loading ranges.
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