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Concept
Calcitriol
Summary
Calcitriol is the active form of vitamin D, normally made in the kidney. It is also known as 1,25-dihydroxycholecalciferol. It is a hormone which binds to and activates the vitamin D receptor in the nucleus of the cell, which then increases the expression of many genes. Calcitriol increases blood calcium (Ca2+) mainly by increasing the uptake of calcium from the intestines.
It can be given as a medication for the treatment of low blood calcium and hyperparathyroidism due to kidney disease, low blood calcium due to hypoparathyroidism, osteoporosis, osteomalacia, and familial hypophosphatemia, and can be taken by mouth or by injection into a vein. Excessive amounts or intake can result in weakness, headache, nausea, constipation, urinary tract infections, and abdominal pain. Serious side effects may include high blood calcium and anaphylaxis. Regular blood tests are recommended after the medication is started and when the dose is changed.
Calcitriol was identified as the active form of vitamin D in 1971 and the drug was approved for medical use in the United States in 1978. It is available as a generic medication. In 2020, it was the 277th most commonly prescribed medication in the United States, with more than 1 million prescriptions. It is on the World Health Organization's List of Essential Medicines.
Calcitriol is prescribed for:
Treatment of hypocalcaemia – hypoparathyroidism, osteomalacia (adults), rickets (infants, children), renal osteodystrophy, chronic kidney disease
Treatment of osteoporosis
Prevention of corticosteroid-induced osteoporosis
Calcitriol has been used in an ointment for the treatment of psoriasis, although the vitamin D analogue calcipotriol (calcipotriene) is more commonly used. Calcitriol has also been given by mouth for the treatment of psoriasis and psoriatic arthritis. Research on the noncalcemic actions of calcitriol and other VDR-ligand analogs and their possible therapeutic applications has been reviewed.
Official source
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