Misc: hypervitaminosis A syndrome.
RE = retinol equivalents. Doses should be individualized on the basis of degree of deficiency. RDA: Adult males 1000 mcg RE; adult females 800 mcg RE
Kwashiorkor
- IM (Children): 30 mg followed by oral dosing.
- PO (Adults and Children >8 yr): 10,00020,000/day for at least 2 mo.
- PO (Children <8 yr): 5,00010,000/day for at least 2 mo.
Xerophthalmia
- PO, IM (Children): 110 mg/day PO as retinyl palmitate or 55 mg IM then 110 mg PO/day given with vitamin E to improve effectiveness.
Parenteral dosing
- IM (Adults): 1000,000 units/day for 3 days, then 50,000 units/day for 2 wk with additional followup oral therapy of 10,00020,000 units/day.
- IM (Children 18 yr): 17,50035,000 units/day for 10 days with additional followup oral therapy of 500010,000 units/day.
- IM (Infants): 750015,000 units/day with additional followup oral therapy of 500010,000 units/day.
- IV (Adults and Children): Infused as part of TPN in amounts required to meet nutritional needs (in parenteral multivitamin preparations).
Therapeutic Classification: vitamins (fat-soluble)
Absorption: GI absorption requires bile acids, fat, lipase, and protein. Aqueous preparations are absorbed more readily than emulsions.
Distribution: Stored primarily in the liver (2-yr supply); small amounts stored in kidneys and lungs. Does not cross the placenta but enters breast milk.
Metabolism/Excretion: Mostly metabolized by the liver.
Half-life: Unknown.