Preparations of vitamin D2 stored in conditions that exclude the effects of light and air, inactivating them: oxygen oxidizes vitamin D2, and light turns it into toxic toxifier.
It should be borne in mind that vitamin D2 possesses cumulative properties. With prolonged use it is necessary to determine the concentration of calcium in the blood and urine. When treating large doses of ergocalciferol, simultaneous intake of vitamin A at 10-15 thousand IU / day, as well as ascorbic acid and B vitamins is recommended.
When ergocalciferol is prescribed for premature infants, it is advisable to administer phosphate simultaneously.
It should be borne in mind that the sensitivity to vitamin D2 in different patients it is individual and in a number of patients the administration of even therapeutic doses can cause the phenomenon of hypervitaminosis.
Sensitivity of newborns to vitamin D2 can be different, some of them can be sensitive even to very low doses. Children receiving vitamin D2 in a dose of more than 1800 ME for a long period of time, the risk of growth retardation increases.
For the prevention of hypovitaminosis, most preferably a balanced diet.
Newborns who are breastfed, especially mothers with dark skin and / or who are deficient in insolation, have a high risk of vitamin D deficiency2.
Ergocalciferol is not recommended for family hypophosphatemia and hypoparathyrosis due to the need for high doses and the high risk of overdose (these nosologies are most preferred dihydrotachysterol and calcitriol).
Hypercalcemia in the mother (associated with a prolonged overdose of vitamin D2 during pregnancy) can cause the fetus to increase the sensitivity to vitamin D2, suppression of parathyroid function, syndrome of specific elf-like appearance, mental retardation, aortic stenosis.
In old age, the need for vitamin D2 may increase as a result of decreased absorption of vitamin D2, reducing the ability of the skin to synthesize provitamin D3, reducing the time of insolation, increasing the incidence of renal failure.
With prolonged use of therapeutic doses (more than 20 days), it is necessary to make a study of calcium and phosphorus in the blood and urine.