Mechanism of action of Calcitriol is:: (A) Decreased calcium resorption calcium from bone, (B) Increase calcium absorption from intestine, (C) Decreased calcium absorption from kidney, (D) Decrease calcium absorption from intestine
Answer is B. Calcitriol is a synthetic version of Vitamin D3 used to treat calcium deficiency with hypoparathyroidism Bone-calcitriol increases resorption of calcium from bone.kidney-it increases calcium reabsorption in the distal tubule.intestine-it promotes intestinal absorption of calcium (Ref.Essentials of medical pharmacology TD Tripathi 7th edition page no.338)