Medical Definition of CalcitriolCalcitriol: The active form of vitamin D. Calcitriol is formed in the kidneys or made in the laboratory. It is used as a drug to increase calcium levels in the body in order to treat skeletal and tissue-related calcium deficiencies caused by kidney or thyroid disorders. Last Editorial Review: 6/14/2012 Back to MedTerms online medical dictionary A-Z List Need help identifying pills and medications? |


