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RX BIN: 015558
Group ID: DDN6600
Card Holder ID: DDN6600

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2018 Price of Ergocalciferol

Drisdol 50000 unit capsule



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Ergocalciferol volume of distribution

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What is Ergocalciferol

Ergocalciferol (Vitamin D2) is a derivative of ergosterol formed by ultraviolet rays breaking of the C9-C10 bond. It differs from cholecalciferol in having a double bond between C22 and C23 and a methyl group at C24.

Ergocalciferol mechanism of action

Activated ergocalciferol increases serum calcium and phosphate concentrations, primarily by increasing intestinal absorption of calcium and phosphate through binding to a specific receptor in the mucosal cytoplasm of the intestine. Subsequently, calcium is absorbed through formation of a calcium-binding protein. 25-hydroxyergocalciferol is the intermediary metabolite of ergocalciferol. Although this metabolite exhibits 25 times more activity than unactivated ergocalciferol in curing rickets and inducing calcium absorption and mobilization (from bone) in animals, this increased activity is still insufficient to affect these functions at physiologic concentrations. Activated ergocalciferol stimulate resorption of bone and are required for normal mineralization of bone. Physiological doses of ergocalciferol also promotes calcium reabsorption by the kidneys, but the significance of this effect is not known.

Dosage forms of Ergocalciferol

Form Route Strength
Drops oral
Capsule oral
Tablet oral
Prescription Generics


International Brands

Aquasol A D Drops


(3beta,5Z,7e,22e)-9,10-Secoergosta-5,7,10(19),22-tetraen-3-ol (5Z,7e,22e)-(3S)-9,10-Seco-5,7,10(19),22-ergostatetraen-3-ol


Rhone Poulenc Rorer Consumer Inc.

CAS number






Affected organisms

Humans and other mammals

Indication of Ergocalciferol

For use in the management of hypocalcemia and its clinical manifestations in patients with hypoparathyroidism, as well as for the treatment of familial hypophosphatemia (vitamin D resistant rickets). This drug has also been used in the treatment of nutritional rickets or osteomalacia, vitamin D dependent rickets, rickets or osteomalacia secondary to long-term high dose anticonvulsant therapy, early renal osteodystrophy, osteoporosis (in conjunction with calcium), and hypophosphatemia associated with Fanconi syndrome (with treatment of acidosis).

Toxicity of Ergocalciferol

LD sub 50 /sub = 23.7 mg/kg (Orally in mice); LD sub 50 /sub = 10 mg/kg (Orally in rats ); Nausea, vomiting and diarrhea, weight loss, irritability, weakness, fatigue, lassitude, and headache.

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