Vitamin D and Related Compounds (Systemic)
Before Using This Dietary Supplement
If you are taking this dietary supplement without a prescription, carefully
read and follow any precautions on the label. For vitamin D and related compounds,
the following should be considered:
Allergies - Tell your health care professional if you have ever
had any unusual or allergic reaction to alfacalcidol, calcifediol, calcitriol,
dihydrotachysterol, doxercalciferol, ergocalciferol, or paricalcitol. Also,
tell your health care professional if you are allergic to any other substances,
such as foods, preservatives, or dyes.
Pregnancy - It is especially important that you are receiving
enough vitamin D when you become pregnant and that you continue to receive
the right amounts of vitamins throughout your pregnancy. The healthy growth
and development of the fetus depend on a steady supply of nutrients from the
You may need vitamin D supplements if you are a strict vegetarian (vegan-vegetarian)
and/or have little exposure to sunlight and do not drink vitamin D-fortified
Taking too much alfacalcidol, calcifediol, calcitriol, dihydrotachysterol,
or ergocalciferol can also be harmful to the fetus. Taking more than your
health care professional has recommended can cause your baby to be more sensitive
than usual to its effects, can cause problems with a gland called the parathyroid,
and can cause a defect in the baby's heart.
Doxercalciferol or paricalcitol have not been studied in pregnant women.
However, studies in animals have shown that paricalcitol causes problems in
newborns. Before taking this medicine, make sure your doctor knows if you
are pregnant or if you may become pregnant.
Breast-feeding - It is especially important that you receive the
right amounts of vitamins so that your baby will also get the vitamins needed
to grow properly. Infants who are totally breast-fed and have little exposure
to the sun may require vitamin D supplementation. However, taking large amounts
of a dietary supplement while breast-feeding may be harmful to the mother
and/or baby and should be avoided.
Only small amounts of alfacalcidol, calcifediol, calcitriol, or dihydrotachysterol
pass into breast milk and these amounts have not been reported to cause problems
in nursing babies.
It is not known whether doxercalciferol or paricalcitol passes
into breast milk. Be sure you have discussed the risks and benefits of the
supplement with your doctor.
Children - Problems in children have not been reported with
intake of normal daily recommended amounts. Some studies have shown that infants
who are totally breast-fed, especially with dark-skinned mothers, and have
little exposure to sunlight may be at risk of vitamin D deficiency. Your health
care professional may prescribe a vitamin/mineral supplement that contains
vitamin D. Some infants may be sensitive to even small amounts of alfacalcidol,
calcifediol, calcitriol, dihydrotachysterol, or ergocalciferol. Also, children
may show slowed growth when receiving large doses of alfacalcidol, calcifediol,
calcitriol, dihydrotachysterol, or ergocalciferol for a long time.
Studies on doxercalciferol or paricalcitol have been done only in adult
patients, and there is no specific information comparing the use of doxercalciferol
or paricalcitol in children with use in other age groups.
Older adults - Problems in older adults have not been reported with
intake of normal daily recommended amounts. Studies have shown that older
adults may have lower blood levels of vitamin D than younger adults, especially
those who have little exposure to sunlight. Your health care professional
may recommend that you take a vitamin supplement that contains vitamin D.
Medicines or other dietary supplements - Although certain medicines or dietary supplements should not be used together
at all, in other cases they may be used together even if an interaction might
occur. In these cases, your health care professional may want to change the
dose, or other precautions may be necessary. When you are taking vitamin D
and related compounds, it is especially important that your health care professional
know if you are taking any of the following:
Antacids containing magnesium - Use of these products with any
vitamin D-related compound may result in high blood levels of magnesium,
especially in patients with kidney disease
Calcium-containing preparations or
Thiazide diuretics (water pills) - Use of these preparations
with vitamin D may cause high blood levels of calcium and increase the chance
of side effects
Vitamin D and related compounds, other - Use of vitamin D with
a related compound may cause high blood levels of vitamin D and increase the
chance of side effects.
Other medical problems - The presence of other medical
problems may affect the use of vitamin D and related compounds. Make sure
you tell your health care professional if you have any other medical problems,
Heart or blood vessel disease - Alfacalcidol, calcifediol, calcitriol,
or dihydrotachysterol may cause hypercalcemia (high blood levels of calcium),
which may make these conditions worse
Kidney disease - High blood levels of alfacalcidol, calcifediol,
calcitriol, dihydrotachysterol, or ergocalciferol may result, which may increase
the chance of side effects
Sarcoidosis - May increase sensitivity to alfacalcidol, calcifediol,
calcitriol, dihydrotachysterol, or ergocalciferol and increase the chance
of side effects