Drilldown: Medicines

Cholecalciferol (vitamin D3) (1)

Many OTC; Rx 50,000 IU also available (1)

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'"`UNIQ--vote-0000042C-QINU`"' D3 is more potent than D2 at raising and sustaining serum 25(OH)D per dose, and is the more common OTC formulation; D2 remains the dominant Rx 50,000 IU formulation in the US for historical reasons. (1)

'"`UNIQ--vote-0000042D-QINU`"', '"`UNIQ--vote-0000042E-QINU`"', '"`UNIQ--vote-0000042F-QINU`"', '"`UNIQ--vote-00000430-QINU`"' (1)

Maintenance 800-2,000 IU PO daily; deficiency replacement 50,000 IU PO weekly for 8-12 weeks then maintenance, or equivalent daily dosing 5,000-10,000 IU/d (1)

OTC 400, 1,000, 2,000, 5,000 IU softgels and tablets; Rx 50,000 IU capsules; liquid drops 400-2,000 IU/drop (1)

No strict; Institute of Medicine UL 4,000 IU/d in adults for chronic use (1)

for severe malabsorption) (1) · IM (rare (1) · Oral (1)

Weeks to raise 25(OH)D into reference range (1)

None · 24 hours · 4-6 hours · 12 hours · 6-8 hours · Daily dosing · 8-12 hours · 12-24 hours · Hours · Hours per application · 24 hours (HS dosing) · 24 hours (once-daily dosing) · 24 h · N/A · N/A (replacement) · Variable · ~7-8 hours · 3-5 hours · 4-6 hours (IR); 24 hours (ER) · 6-12 hours

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~24 hours (parent); ~15 days (25(OH)D); tissue stores months (1)

~75% (oral; absorption improved with fat-containing meal) (1)

Safe at replacement doses; deficiency is itself a risk in pregnancy and lactation.<sup class="pcp-cn" title="This claim needs a citation.">&#91;[[Pharmacopedia:Citation needed|citation&nbsp;needed]]&#93;</sup> (1)

OTC (most) and [[USLegal:Prescription only|Rx-only]] (50,000 IU) in US (1)